0+Page 1 of 50
HINDUSTAN PETROLEUM CORPORATION LIMITED MUMBAI REFINERY
DHT PROJECT
PART : III
SECTION : A
TITLE : ENGINEERING DESIGN BASIS
PIPING
DOCUMENT NO: 44LK-5100-00/L.02/002/A4
1 06.04.09 50 Revised as marked & Issued as Amendment
no.1
DRP RMP RMP/PVS
0 03.12.08 50 Issued for FEED DRP RMP RMP/PVS
Rev No. Issue Date Pages Description Prepared
By Checked
By Approved
By
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 2 of 50
TABLE OF CONTENTS
1.0 PURPOSE
2.0 SCOPE
3.0 GENERAL CRITERIA
3.1 EQUIPMENT LAYOUT
3.2 PIPING MODELING & GENERAL ARRANGEMENT
3.3 OFFSITES AND YARD PIPING
3.4 TANK FARM PIPING
3.5 UNDERGROUND PIPING
3.6 VENTS AND DRAINS
3.7 FLEXIBILITY ANALYSIS & SUPPORTING
3.8 FLARE PIPING
3.9 MATERIALS AND SELECTION OF PIPES AND FITTINGS
3.10 NDT REQUIREMENTS
3.11 STRAINERS
3.12 WELDING
4.0 REFERENCED PUBLICATION
ANNEXURES
ANNEXURE A ACCESSIBILITY FOR VALVES & INSTRUMENTS
ANNEXURE B CLEARANCES
ANNEXURE C VERTICAL AND HORIZONTAL GUIDES SPACING
ANNEXURE D TABLE OF BASIC SPAN
ANNEXURE E TECHNICAL REQUIREMENTS OF PIPING MATERIAL
ANNEXURE F GENERAL REQUIREMENT
ANNEXURE G STANDARD DRAWINGS
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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1.0 PURPOSE
The purpose of this document is to establish a common understanding between PMC & LSTK
Contractor on Piping Design Philosophies for DHT Project at HPCL, Mumbai Refinery.
2.0 SCOPE
This Design Basis defines briefly the general guidelines for piping viz: preparation of equipment
layout, piping arrangement, piping material specifications and local statutory / safety
requirements. In case of any discrepancy or contradiction either in this Design Basis, or in
Standard Drawings / Standard specifications, It is deemed mandatory to follow the
requirements of the national / International design codes / standards, local statutory rules or
OISD guide lines as applicable. The standard drawings provided in the BID are for reference
and for conceptual understanding only and thus not exhaustive. Where ever necessary, either
for the lack of information or non availability, LSTK shall prepare or develop the required
specifications/standard drawings and use the same with prior approval of PMC
2.1 DEFINITION :
OWNER - Hindustan Petroleum Corporation Limited, Mumbai Refinery.
PMC - Jacobs Engineering India Pvt. Ltd.
LSTK - Successful Bidder
3.0 GENERAL CRITERIA
3.1 EQUIPMENT LAYOUT
3.1.1 BASIS OF EQUIPMENT LAYOUT
Equipment Layout shall be developed based on the following data:
• P&IDs
• Typical Equipment Layout – Diesel Hydro treating Unit, by Process Licensor
• Indicative Equipment Layout by PMC
• Equipment Process Data Sheets.
• Wind direction.
• Overall Plot Plan
• Tie-in-Points for process & utilities with existing Plant.
3.1.2 DEVELOPMENT OF EQUIPMENT LAYOUT
The following aspects shall be considered during development of Equipment Layout:
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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1. Process requirement – i.e. proper interconnection between equipment as per P& ID’s to
achieve the intended process parameters. The indicative Equipment Layout by PMC only
provides a suggested equipment layout that conforms to accepted good practice and
incorporates the critical relationships between major equipment that affect process
performance.
2. Economy of Piping material - Minimize the quantity of costly piping.
3. Erection & Construction requirement: -
Erection scheme and schedule of all equipment must be considered during equipment layout
to have smooth erection mainly in case of tall columns, heavy equipments like thick walled
reactors, approach road for cranes/ derrick for lifting the column or reactors and requirement
of special foundation/pile etc.
4. Safety Requirements including fire fighting, and hazardous area classification, Access
stairways in the platform/Technological structures.
5. Petroleum Rules, OISD Standard guidelines shall be followed. Fire fighting facility shall
be as per TAC and OISD norms. Safety shower location shall be marked in equipment
layout. The relevant standards are to be followed for preparation of hazardous area
drawings.
6. Operation and Maintenance requirement as mentioned below:
• Overhead and side clearances for exchangers and pumps
• Provision of exchangers - tube bundle pulling area
• Horizontal and overhead clearances for easy movement of working personnel
• Crane approaches for air coolers / fired heaters
• Provision for catalyst loading / unloading facilities
• Provision for monorail for pumps and exchangers
• Provision for EOT / HOT crane for compressors
• Provision for operator’s cabin
7. Similar equipment grouping – All columns, exchangers, pumps etc. shall be grouped together
for convenience of maintenance and safety wherever feasible.
8. The technological structures should be interconnected for easy movement of operational
personnel.
9. All areas requiring crane access in erection/maintenance of equipments, catalyst loading etc.
shall be marked on the equipment layout.
10. U/G piping corridors for main headers should be marked in equipment layout for all
underground piping.
11. Fire proofing requirements in pipe racks, structures & supporting equipments.
12. Eye wash & shower locations, Utilities stations.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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3.1.3 PIPE RACK
In general, equipment layout shall be prepared considering straight pipe rack, however other
shapes like L/T/U/H/Z etc can also be considered based on area available.
The total width of pipe rack shall include 30% extra space or 1.5m (min) for future modifications
in unit at later stage at all levels/tiers.
The width of the rack shall be 6m, 8m or 10m for single bay and 12M, 16M or 20M for double
bay having 4 tiers maximum. For interconnecting pipes to different units, existing pipe racks to
be expanded wherever possible considering foundation and column design. The spacing
between pipe rack portals shall be taken as 6m in general. However it can be changed to suit
intra unit’s distances.
Each bay between two passing columns shall have secondary structural members at a span of
3m to enable supporting of small bore lines.
Pipe racks shall be fireproofed, as per OISD Codes with provision of insert plates in supporting
auxiliaries.
- Clearance beneath pipe rack shall be 4.5m minimum
- Road Clearance shall be 9m minimum for main road. Secondary road clearance shall be
5m.
- Dia. 20 rod above Sleeper/Pipe rack to be made of CS.
- Deleted.
- Corrosion wear pads shall be provided for all the lines at support locations.
3.1.4 REACTORS
The reactor superstructure structural steel columns shall be placed in line and symmetrically so
that piping routing is shorter, easier, and economical and the whole area looks aesthetically laid
out.
Maintenance access required near the reactor structure is mainly for catalyst loading and
unloading.
Stairway is provided for the reactor structure since the structure goes high and is frequently
used by operators. Emergency escape ladder shall also be provided.
Depending on the type of catalyst loading system i.e. fixed or mobile or as indicated in Process
Licensor’s Package; make space allocation in the layout as required. The paved areas at grade
will extend around catalyst unloading / loading areas
Since reactors are heavily insulated, insulation to be shown on equipment layout drawing.
Reactor shall have davits to handle top man way covers and its piping.
1
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3.1.5 REBOILER
Reboiler shall be located next to the tower they serve. The elevation of Reboiler shall be as
given in the P&IDs. Horizontal thermo-siphon exchangers are located at a minimum
elevation. Vertical thermo-siphon types are usually supported by the tower and are located
on the backside to be accessible for maintenance. Large vertical types, which cannot be
supported from the tower/ column, may require a separate supporting structure. As far as
possible they shall not be mounted on springs to take care of differential expansion. No
platform/ piping to obstruct removal of vertical Reboiler with the help of crane. Vertical
Reboiler will require guides, where length/ diameter exceed 6.0 m. Reboiler piping shall be
checked for pressure drop before finalization of the same. Clear crane access shall be
provided for maintenance of unfired type re-boilers including piping elements like 3-way valve
etc.
3.1.6 HORIZONTAL VESSELS
The Horizontal vessels shall be laid perpendicular to pipe rack and dished end shall be placed
minimum 4 m away from the pipe rack. The clearance between horizontal vessel shells shall be
minimum 2m or 900 mm clear aisle whichever is higher. The aisle minimum 900mm/OISD as
specified should be clear of any piping or instrument element (like LS, LG etc.) All the inter
equipment distances shall be as per OISD std.
High-pressure vessels shall be aligned with their dished ends facing away from the plant.
The chemical vessels to be located close to the dosing pumps to the extend possible.
3.1.7 TOWERS AND VERTICAL VESSELS
Towers and vertical vessels shall be arranged in a row with common centerline, decided by
largest vessel, placing O.D of the equipment minimum 4m away from pipe rack. A minimum
clearance of 3m shall be maintained between tower shells, but in any case, minimum 100mm
horizontal gap shall be provided between platforms of adjacent towers. A minimum of 900mm
clearance shall be provided between tower plinths.
A davit is required to be provided to handle the heavy items (like relief valves, blinds, covers
etc.) The davit shall be on the side of column/vessel away from pipe rack.
The area at grade level to be kept clear for dropout.
Efforts shall be made to provide interconnecting platforms at suitable levels for adjacent
towers, considering thermal expansions of towers. All level switches, LG etc. including their
isolation valves, shall be accessible from ladders / platforms.
Chemical vessels shall be located close to the dosing point to the extent possible.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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PUMPS
Clearance between two adjacent pumps shall be such that clear 1000mm aisle is available.
Wherever practicable, pumps shall be arranged in rows with the centerline of the discharge on
a common line; in general pumps shall be kept outside the pipe rack only with motor facing
opposite to equipment.
3.1.8
All pumps not open to sky, with motor rating 75 KW and above, shall be provided with monorail
under pipe rack / shed. Clearance between two adjacent pumps shall be such that clear
1000mm aisle is available.
Pumps shall not be located within bunded (dyked) tank areas. Hydrocarbons process pumps
shall not be installed beneath equipment containing flammable or combustible liquids other than
unit pipe racks, unless special fireproofing and fire fighting precautions are taken, like water
spray system.
All process pumps handling class ‘A’ fluid shall be provided with water sprinkle/spray system
3.1.9 EXCHANGERS
In most of the cases floating head of exchangers shall be placed on a line 4 m away from
pipe rack. Shell and tube type exchangers may have a removable shell cover with flanged
head. Tube pulling or rod cleaning area must be allowed at the channel end. This shall be
minimum tube bundle length + 1.5 m from the channel head.
One number of tube bundle puller (common) to be considered in all the exchangers.
Minimum clearance in between two horizontal exchangers shall be 2.0 m or 900 mm clear
aisle whichever is higher. The minimum clear aisle specified between the exchangers i.e.,
900mm, shall be clear from any piping element and instrument including probes of
thermocouples.
Likewise Heat Exchanger train should be suitably spaced such that shell / tube inlet/outlet
piping do not foul with floating head covers.
Monorails to be provided for tube bundle removal for all exchangers except for those, which
are open sky. Davits to be provided for floating head cover for all exchanger.
Elevation of exchangers shall be kept to minimum but shall be of sufficient height to allow
drainage from low points of exchanger piping. Clear access shall be provided for the OWS and
CBD valves of the exchangers. No piping element like CBD / OWS valves shall be located on
grade directly below the channel cover and shell cover.
The roof height of the technological structure shall be sufficient to allow erection of exchangers
(including stack type) by crane. On technological structure- monorail with chain pulley block will
be provided for exchanger bundle removal.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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3.1.10 FIN FAN EXCHANGERS/ AIR FIN COOLERS
Fin Fan Exchangers / Air Fin Coolers shall preferably be located over the main unit pipe rack.
Suitable access for maintenance shall be provided. For air coolers located on technological
structure/rack, pipe concrete blind floor shall be provided below the air coolers. Blind floor is
generally not required if pumps handling hydrocarbons or equipment are not placed below
them. Pumps handling hydrocarbon, shall not be placed below the air fin coolers.
The width of the structure from where Air Fin Exchanger assembly is supported shall be about
2m more than the Air Fin Exchanger tube length so that supporting of piping manifold (inlet /
outlet) can be done from the main member of pipe rack / technological structure, thus
transferring the load to main structural members. Monorail shall be provided at one end of air
cooler platform area for lowering the gearboxes.
Following access shall be provided for air coolers mounted on pipe racks :
- Service platform to access the flanged inlet/outlet nozzles
- Plat forms to servicing the Fan, Drives, Gears etc. below to Air coolers.
- All platforms /walkways shall be supported from air cooler structure
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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3.1.11 FURNACES/FIRE HEATERS
When the hydrocarbon being handled is above its auto-ignition temperature in process,
equipment may be located close to the heater and adequate access for maintenance and
adequate fire protection to be provided. This is done to reduce high hazard spreading within the
plant
Furnaces/Fire Heaters shall be located upwind or side wind of process units to blow any
combustible leaks away from the open flame. They shall be located minimum 90 m away from
tanks and 30m away from control room. Distances for equipments handling hydrocarbon from
the heaters shall be strictly as per OISD norms. Vessels/ reactors/ columns directly connected
to heater (if required as per P&ID) are exception. Heaters shall be arranged with centerline of
the stacks on a common line in case of circular heater and wherever a common stack is
furnished to cater more than one heater the stacks shall be located at the end or side, which is
away from the unit. In case of individual box heater, the edge of the heaters on the rack side
shall be matched.
The stack height governed by the clearances from statutory authorities like Director General of
Civil Aviation and Pollution Control Board or any other safety norms whichever is stringent. For
maintenance, vertical tube heater must have access to permit a crane to remove and replace
tubing. Horizontal tube heater must have horizontal free space equal to tube length plus crane
parking space for tube pulling /maintenance/cleaning. In case of bottom floor fired heaters,
there shall be adequate headroom clearance underneath furnace for removal of burners. In
case of wall fired heater min 2m wide platform with escape route at each end is necessary.
Pits and trenches are not permitted under heater or any fired equipment. Underground drain
points and manhole covers shall be sealed within heater vicinity.
Furnaces shall be provided with platforms for operation and for access as follows
- For maintenance of soot blowers
- For burner operation when inaccessible from grade.
- For observation door, except that when the doors are located less than 3600mm,
Above grade. Access shall be by ladder only
- When temporary platforms for header boxes containing removable plug fittings
Are required, only the platform supports are to be provided.
- For analyzer and sample points etc
3.1.12 COMPRESSORS AND THEIR PRIME MOVERS
Two major types of compressors are used in process plants.
Centrifugal Compressors
Reciprocating Compressors
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Compressors shall be located to keep suction lines as short as possible. Drivers for
compressor may be electric motor or steam turbines as per P&ID. The gas Compressors shall
be located downwind side of furnace so that leaks are not blown towards the furnace.
In general Compressors are kept under shed. When Compressors are kept under shed, sides
are fully open for the low shed or partially closed from top for high shed to avoid accumulation
of heavier gases in the shed. Layout of the compressor shall facilitate maintenance space for
removal of motor, piston etc.
In case of a turbine driven compressor, if exhaust steam is condensed, turbine and compressor
are located at an elevated level and condenser is located below turbine. A major consideration
in centrifugal compressor location is the lube and seal oil console. It must be accessible from a
road, must be lower than the compressor to allow gravity drain of oil to the consoles oil tank.
Intercoolers are placed near the compressor and are kept within the shed. Knockout pots and
after coolers may be kept outside the shed but near compressor house.
For compressors, one electrically operated traveling (EOT) crane to handle heaviest removable
piece shall be provided for each compressor house. Maintenance bay for compressors shall be
provided. Maintenance bay shall be accessible from road to facilitate unloading of load on to
truck etc. For removal of exchangers located within building monorail arrangement shall be
provided.
The layout of compressor house shall take into consideration process licensor’s requirement as
well as compressor manufacturer’s
3.1.13 CLEARANCE AND ACCESSIBILITY
3.1.13.1 Crane Access & tube bundle pulling
Equipment, structures shall be arranged to permit crane access to service air coolers,
Compressors and exchangers.
All exchanger tube bundles shall be "jacked out" against shell. A clear space for tube bundle
removal shall be provided. Dropout bay/area may be considered for exchangers located at
elevated structure. Provision for pulling and inserting of tube bundle to be provided. Monorail
with chain-pulley shall be provided for all heat exchangers except on grade & open to sky
For high-pressure exchangers, shell pulling on rails may be considered with prior approval of
PMC / OWNER.
3.1.13.2 Access to Pumps
Clear access of 3.8 m vertically and 4 m horizontally shall be provided centrally under main
pipe ways for small mobile equipment to service pumps, wherever these are located under pipe
rack. Pumps outside the rack shall be approachable by small cranes from under the pipe rack.
3.1.13.3 Access to lowering items to grade level (Lowering Area)
Clear access shall be provided at grade on the access side for lowering external and internal
fittings from tall elevated equipment by providing pipe davits.
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3.1.13.4 Layout & access requirements for Platforms Ladders and Stairs
3.1.13.4.1 For providing platform ladder & staircase following guidelines shall be followed:
• Two means of access shall be provided (i.e., two ladders or one ladder and one stair
case) at any elevated platform, which serves three or more vessels and for battery limit
valves / operating platform.
• Platforms, Ladders and stairways shall be the minimum, consistent with access and
safety requirements.
• Stairways for tanks to be provided on upstream of predominant wind direction
3.1.13.4.2 Platform at elevated structure:
• Unless otherwise mentioned dual access (i.e. one staircase and one ladder) shall be
provided for structure having length up to 22.65 m (75ft). For large elevated structure,
if any part of platform has more than 22.65 m (75 ft) of travel, it shall have staircases on
both sides. Also, based on height and levels of operating platform/technological
structures, stairways shall be provided on both sides.
• Fire heaters located adjacent to one another shall have inter-connecting platform at
various elevations. Fire heaters shall have minimum two stairways- access from grade
level and will extend up to highest level of operating platform of the heaters.
• Air coolers shall have platforms with interconnected walkways provided to service
valves ,Fan motors ,Instruments etc.
• Location at which normal monitoring (once a day or more) is required or where
samples are taken shall be provided with stair access.
• Items that require occasional operating access including valves, spectacle blind and
motor operated valves; heater stack sampling points shall be provided with ladder
access.
• Columns and technological structure shall be interconnected by walkway.
• All nozzles of columns to be provided with ladder access.
• No ladder shall be more than 6m in one flight
• (Refer Annexure A for accessibility guidelines.)
3.1.13.5 Clearances
Minimum clearances shall be as indicated in Annexure B.
3.2 PIPING MODELING AND GENERAL ARRANGEMENT
3.2.1 BASIS OF 3D MODELING (ISBL)
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Piping and Instrument Diagram, Inter connecting P&ID.
Equipment layout
Piping Specification and cats & specs
Line list
Instrument data sheet & vendor drgs
The following objective shall be ascertained during piping modeling
Proper access to all operating points including valves and instruments.
(Refer Annexure A)
Proper access to inter-related operating points for specific purpose.
Economic routing with minimum bends and flanges
Aesthetics
3.2.2 UNIT PIPING
3.2.2.1 Basis of Piping
• Piping and Instrument Diagram
• Equipment Layout
• Equipment Data sheet and Setting plan
• Line list
• Instrument Data sheet
• Structural and Building drawings
• Topography of the plant
• Piping material specification
• Overall plot plan
Proper access to all operating points including valves /instruments and for maintenance
purpose shall be considered during piping layout.
3.2.2.2 Pipe ways/Rack piping
Racks shall be designed to give the piping shortest possible run and to provide clear head
rooms over main walkways, secondary walkways and platforms. The entire Tie in points are
to be clearly studied and identified so as to avoid any unnecessary crossing and jump over
of pipes.
Predominantly process lines are to be kept at lower tier and utility & hot process lines on
upper tier.
Generally the top tier is to be kept for Electrical and Instrument cable trays.
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Generally the hot lines and cold lines shall be kept apart in different groups on a tier.
Generally the bigger and heavier size lines shall be kept nearer to the column.
Spacing between adjacent lines shall be decided based on O.D. of bigger size flange (min
300# flange), O.D. of the smaller pipe, individual insulation thickness and additional 25 mm
clearance, preferably. Wherever even if the flange is not appearing the min. spacing shall
be based on above basis.
Anchors on the racks are to be provided on the anchor bay if the concept of anchor bay is
adopted. Otherwise anchors shall be distributed over two to three consecutive bays.
Anchors shall be provided within unit on all hot lines leaving the unit.
Process lines crossing units (within units or from unit to main pipe way) are normally
provided with a block valve, spectacle blind and drain valve. Block valves are to be
grouped and locations of block valves in vertical run of pipe are preferred. If the block
valves have to be located in an overhead pipe way, staircase access to a platform above
the lines shall have to be provided. Provision of block valves, blinds etc. shall be as per
Process Design Basis & P&IDs.
3.2.3 PIPING
3.2.3.1 Design Pressure :
The design pressure of each line is the maximum non-shock internal service pressure. This
pressure corresponds with maximum of: 1.1 times the maximum operating pressure.
Design pressure of equipment to which it is connected.
The pressure setting of the relief valve that protects piping system. For liquid lines, static
head between lowest point and safety valve also to be added.
The pump shut-off pressure or a compressor’s maximum discharge pressure for system
with no relief valves or 1.2 times differential pressure plus suction pressure for discharge
lines.
The static plus pressure head for system on the suction side of pumps.
In cases where a pump discharge line includes a control valve, but no relief valve that
portion of line from the pump through the control valve, including all valves in the control
valve manifold; shall have the same design pressure as the pump shut-off pressure.
All lines operating below atmospheric pressure shall be designed for full vacuum. Lines
which normally do not operate in vacuum but vacuum can develop in abnormal condition
shall also be designed for vacuum.
All piping leaving Battery limit shall be designed for a closed valve outside the Battery Limit.
Higher design pressure shall apply from the source to the last valve before entering
equipment rated at a lower pressure.
Process shall decide design pressure of pipe line.
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3.2.3.2 Design Temperature
The design temperature shall be maximum sustained fluid temperature in line.
All the lines subjected to steam-out conditions shall be designed at 120°C (process line data) or
as per process Design temperature of the line whichever is higher.
The design temperature of piping may be the same as the design temperature of connecting
upstream equipment – if the difference between the operating temperature and design
temperature is less than or equal to 20°C.
If there is large difference between design and operating temperature, duration and frequency
of process fluid attaining higher temperature shall be considered.
For steam traced piping, design temperature shall be fluid temperature plus 20°C or 10°C
below steam saturation temperature whichever is higher.
For low temperature (operating temperature is either lower than 0°C or lower than minimum
ambient temperature) design temperature shall be minimum operating temperature of the fluid.
Metal temperature resulting from emergency conditions like depressurization, operation errors
etc. need to be taken care of.
Process will decide all the design temperatures of pipeline.
3.2.3.3 Loads & Supports
The piping system shall be designed to resist the efforts of loads imposed by the weight of the
pipe, valves, fittings, insulation and fluid in the lines. When this fluid is air, gas or vapour, and
the line is to be Hydrostatically tested, temporary support may be required.
The additional loads imposed by wind shall be considered for large lines (18" and above). The
wind pressure is spelled out elsewhere in bid document. The discharge of reciprocating
compressors, pumps, HP safety valves and let down valves and other lines which are likely to
pulsate and vibrate shall be properly designed and supported to avoid undue vibrations and
forces/moments on piping, supports and connected equipment/machinery.
Downstream of control valves, safety valves blowing to atmosphere which can attain some
velocities shall be so designed to take care of the same and noise shall not exceed 88 dba at
operating levels, by using diffusers, silencers etc.
The stresses created by the imposed loads shall not exceed the allowable stress prescribed by
the ANSI B 31.3 Code for pressure piping where applicable or the ASME boiler code and
should also meet the requirements of IBR wherever applicable.
3.2.3.4 Corrosion Allowance
The minimum corrosion allowance in general shall be as given below:
Carbon Steel 1.5 mm (1/16")
Alloy Steel 1.5 mm (1/16")
Austenitic Steels 0.0 mm
Non-Ferrous Alloys 0.0 mm
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For corrosive services corrosion allowance for material shall be adequately designed to give a
life of at least 20 years.
Exception to these shall be only with PMC/owner’s approval.
3.2.4 COLUMN / VESSEL PIPING
Piping from column shall drop or rise immediately upon leaving the nozzle and run parallel
and close as practicable to vessel. Reboiler outlet piping shall be as short as possible with
minimum bends.
Piping shall be grouped as far as possible for the ease of supports and shall run on the rack
side of the column.
Manholes shall be kept on the road side of the column and approachable from the platform.
Projection of platform shall be 1.0m up to 1.0m diameter column and 1.2m for column
diameter > 1m from column insulation surface
Piping shall be supported from cleats welded on the vessel as far as possible.
Proper guides at intervals shall be provided for long vertical lines.
For ease of operation and maintenance, column and vessels, which are grouped together,
shall have their platforms at the same elevation should be interconnected by walkways.
However each Column/ Vessel shall have independent access also. Column/ Vessel
platform should be designed in such a way so that all nozzles should be approachable from
platforms.
Piping support cleats shall be designed for safety valves considering impact loading during
popping off.
Complete platform all around shall be provided in case of columns, at all manhole locations.
Maximum height of platform ladders shall be restricted to 6 meters.
Davit shall be provided on top of all columns for handling safety valves, Top curves etc.
3.2.5.1 EXCHANGER PIPING
Exchanger Piping shall not run in the way of built in or mobile handling facilities.
Wrench clearance shall have to be provided at exchanger flanges.
Piping shall be arranged so that they do not hinder removal of shell end and channel cover
and withdrawal of tube bundle.
3.2.5.2 HEATER/FURNACE PIPING
Arrange piping to permit burner removal by providing break up flanges in the piping.
Burner valves shall be located close to peepholes for operation.
Piping to Burners shall be arranged in such a way so as to give equal and sufficient quantity of oil/gas to all burners.
Only flexible metallic SS (SS316/SS321) hoses shall be used for burner piping
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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Block valves for emergency, snuffing steam valve shall be located minimum 15 m away from the heater, preferably on the upwind side of the heater.
Piping from various passes of heater outlet nozzles should preferably be symmetrical. Transfer line from heater to column shall be as short as possible, without pockets, free draining towards column and with minimum bends.
No piping shall be routed in the tube withdrawal area. If unavoidable, break up flanges shall be provided in the piping for removal.
Nozzle forces and moments to be as per API 560
All furnaces if they are located in the same area should be inter connected with each other at different elevations.
3.2.6 PUMP PIPING
Pump drives shall have clear access.
Pump suction piping shall be as short as possible and shall be arranged with particular care
to avoid vapor pockets.
Reducers immediately connected to the pump suction shall be eccentric type flat side up to
avoid the accumulation of gas pocket.
For end suction pumps elbows shall not be directly connected to the suction flange. A
straight piece minimum 3 times the line size shall have to be provided at the suction nozzle.
Pump discharge check valve if installed in vertical lines shall be fitted with a drain
connection as close as possible downstream of the valve.
When a suction vessel operates under vacuum, the vent connection of the pump has to be
permanently connected to vapor space of the suction vessel to allow possible filling of the
pump with liquid before it is started.
T-type strainers are to be used for permanent as well as temporary to avoid disassembly of
suction piping for strainer cleaning for sizes 2" and above.
Y-type strainers are to be used for all sizes in steam services and for pump suction lines
1½" and below
All small-bore piping connected to pump (drain to OWS & CBD, seat and gland leak drain)
shall have provision for break up flanges for removal of pumps.
Piping shall be so arranged that forces and moments imposed on the pump nozzle do not
exceed the allowable values.
Pump discharge should preferably be routed away from pump rather than towards the
motor side.
For top suction, pump elbow shall not be directly connected to suction flange. A straight
piece of minimum 5 times the nozzle size shall have to be provided at the suction nozzle.
Pump cooling water connection shall be taken from the top of the circulating cooling water
header.
PI (pressure gauge) connections shall be provided on upstream and downstream of valves
in suction and discharge lines for all process pumps.
3.2.7 COMPRESSOR PIPING
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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Suction lines shall be as short as possible
Suction piping shall have adequate flanged joints for ease of erection and maintenance.
All operating valves on main suction and discharge piping shall be lined on one side as far
as possible.
A minimum straight length of suction pipe is to be provided as per manufacturer’s
recommendation.
Piping shall be designed so that forces and moments imposed on the compressor do not
exceed the manufacture’s recommendation.
Compressor suction lines between the knockout drum and the compressor shall be as short
as practicable & shall be without pockets.
Where the line between knockout drum and the compressor cannot be routed without
pocket, low point in compressor line shall be provided with drains to remove any possible
accumulation of liquid, but after taking clearance from process licensor.
Low points in the discharge line from an air compressor shall be avoided because it is
possible for lube oil to be trapped and subsequently ignited. If low points are unavoidable,
they shall be provided with drains.
Compressor suction and discharge shall have untied bellows. The bellows are to be
supplied by compressor manufacturer as per design calculations and bellows selection
done as per stress analysis.
All the valves and spectacle blind in suction and discharge piping shall have operating and
maintenance access.
3.2.7.1 Piping arrangement for Centrifugal Compressors
Suction and discharge piping should preferably be routed at grade level to have a proper
supporting of these lines.
Check valve for the compressor shall be located as close as possible to the compressor to
reduce surges.
It would be preferable to bunch valves in one area wherever possible with their hand wheels
facing one direction for ease of operation.
Suction pipes which are too small for manual cleaning, shall be provided with a removable
spool piece to permit installation of a strainer at a convenient, accessible location. Piping
from strainer to equipment nozzle shall have a special note for clearing procedures.
3.2.7.2 Piping arrangement for Reciprocating Compressors
Trenches, pits and similar gas traps be avoided within compressor house.
Compressor suction piping from K.O. Drum shall be independently supported. It is important
to see that this support is not provided from the compressor house steel work. Pulsation
analysis should be carried out to decide the routing of the line.
Suction piping will subject to chemical cleaning as per the procedure specified in JE’s
standard specifications. Also process licensor’s specifications/requirements shall be fulfilled.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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It is very important to route all suction and discharge piping of the compressor as close to
grade level (min 500mm above grade) as practical to provide proper supports for the
system. Concrete sleepers are preferred to steel supports. Sleepers shall be spaced at
varying distances (3000 mm max.) with no adjacent spans being equal, enabling to dampen
the vibration of the piping.
3.2.8 PIPING ARRANGEMENT FOR REACTORS
All reactor piping shall be clear of the access areas of loading / unloading of catalyst
Platforms provided around reactors and for access to piping and valves shall generally be
supported from separate structure. However the platform can be connected to vessel shell if
welding is allowed and cleats are provided. Generally reactor shell clips / cleats are to be
avoided.
Reactor with top man way nozzle for catalyst charging is provided with a flanged elbow
Nozzle on this man way to connect outlet piping. This flanged elbow nozzle is to facilitate
spool removal during catalyst charging.
Piping connected to reactor top outlet nozzle needs to be additionally supported from
structure. (This support acts temporarily) since this connection to man way is dismantled
during catalyst charging.
Swing elbows type arrangement is preferred on the regeneration piping from reactor bottom
as against valves and bypasses. This eliminates stress problems to some extent since the
used hot line and unused cold line are not permanently interconnected.
All valves provided on reactor hydrogen service lines be it inline, vent, drain and instrument
valves shall always be double blocked type. Also snuffing steam rings shall be provided
around hydrogen service flanges size over 12".
For reactor process piping where spec. calls for ring joint flanges the piping shall be
arranged so as to allow for valve removal.
The catalyst unloading / dump nozzle elevation of reactor bottom is to be decided based on
the provision of a catalyst shaker / vibrator equipment to be bolted onto this unloading
nozzle.
3.2.9 RELIEF SYSTEM/ BLOW DOWN SYSTEM PIPING
Relief of liquid and easily condensable hydrocarbons is to be discharged to closed blow
down system.
Wherever the inlet line size is higher than the safety valve inlet size, reducer shall be
installed adjacent to inlet of safety valve.
Relief valve discharging steam, air or other non-flammable vapor or gas directly to
atmosphere shall be equipped with drain or suitably piped to prevent accumulation of liquid
at valve point.
Relief valve discharge piping to atmosphere shall be taken to safe location as per following.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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3 m - Above top platform of column or structure within 6m radius for steam and 8m
for hydrocarbon/ toxic discharge.
25 m - Horizontally away from Reformer Or any fired equipment.
50 m - Horizontally away from furnace, if more than one relief system of different set
pressures is discharging into one common riser of vent stack.
Inlet and outlet piping of pressure relief valve shall be adequately supported to take care of
the thrust induced by the relief valve during popping.
Reaction forces due to safety valve popping shall be ascertained in the connected piping.
The effect of these forces on the piping supports and the anchors of the piping system shall
be calculated to ascertain that the allowable limits at these locations are not exceeded. The
supporting structure also shall be adequately designed so that when subjected to these
System stresses in the inlet and outlet piping portions
At safety valves also shall be kept within the allowable limits, inclusive of the distribution branching points in the inlet portion. These reactive forces shall not lead to any leakage at the flanged joints present in the system. To ascertain these necessary calculations at the flanged joints shall be performed.
3.2.10 STEAM PIPING
Steam lines with conditions listed below fall in the scope of Indian Boiler Regulations (IBR). All
lines falling under IBR purview must comply with IBR requirements.
Lines having design pressure (maximum working pressure) 3.5 Kg/cm2 (g) & above
Line sizes 10" inside diameter & above having design pressure 1.0 Kg/cm2 (g) & above
Lines with pressure less than 1.0 Kg/cm2 (g) are exclusion.
User of steam like steam tracing lines, jacket of the steam jacketed lines, steam heating coil
within the equipment are excluded from IBR scope.
All steam users where downstream piping is connected to IBR i.e. condensate flushed to
generate IBR stream are covered under IBR
Boiler feed water lines to steam generator, condensate lines to steam generator and flash
drum as marked in P&ID shall be under purview of IBR.
IBR Requirements (in brief)
All materials used on lines falling under IBR must be accompanied with IBR Inspection
Certificate, Leading Inspection authority viz. Lloyds or others are authorized inspection
authorities for IBR outside India. Whereas for Indian supply only IBR is the inspection
authority.
IBR authority of state in which the system is being installed must also approve drawings like
General Arrangement Drawings (GAD) and isometrics of lines falling under IBR.
All welders used on fabrication of IBR system must possess IBR welding qualification
certificate.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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IBR system must be designed according to IBR regulations. IBR authority must approve all
design calculations towards the same.
3.2.11 STEAM HEADER & SUPPLY LINES
Steam header shall be located generally on the upper tier and at one end of the rack
adjacent to columns.
Branch lines from horizontal steam header, except condensate collection points, shall be
connected to the top of the pipe header.
Isolation valves if provided on the branch line shall preferably be provided on the horizontal
run and outside the pipe rack.
All branch lines shall be drainable.
The Tapings on the headers shall have Gusset supports.
Drip legs & steam traps shall be provided at all low points and dead ends of steam header.
Drip legs at low points shall be close to down stream riser and shall be provided to suit bi-
directional flows, if applicable.
The first isolation valve on Drip leg (Boot leg) outlet shall be piston type glandless and butt
welded type.
All turbines on automatic control for start up shall be provided with a steam trap in the
steam inlet line.
All traps shall be provided with strainers if integral strainers are not provided.
Steam traps discharging to atmosphere shall be connected to storm water drain/storm
sewer.
Expansion loops are to be provided to take care of the expansions within units.
Line traps shall be thermodynamic type up to Class 600# & bimetallic for piping Class 900#
& above.
Double block Vents and drain valves shall be provided on high-pressure steam piping.
Small size steam valves upto 1 ½ inch NB to be piston type glandless valves.
Wherever condensate is to be drained, proper condensate draining facility shall be
provided.
Discharge of steam traps should not be near the vicinity of any Process / utility lines. Proper
drainage facility must be envisaged for the condensate drain.
3.2.12 Steam Tracing/Steam Jacketing
3.2.12.1 Steam tracing system (If applicable)
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 21 of 50
Tracers for the individual lines shall be supplied from manifolds when there are two or more
connections. Standard module for steam distribution and condensate collection manifolds
with integral glandless piston valve and thermostatic steam trap shall be used. Balanced
Pressure thermostatic steam trap with 40 mesh strainer to be used. Number of Mech. Mant.
Point tracers shall be 4/8/12 and tracer size ½” or ¾” depending upon the detail engg-
requirement. 20% or minimum 2 nos tracer connections shall be kept spare for future use
for both steam supply and condensate collection manifolds. All manifolds shall be installed
in vertical position and manifold size shall be 1.5”.
For Steam tracing balanced pressure thermostatic steam trap with 40 mesh strainer to be
used.
Manifolds shall be provided with two spare blanked off connections.
Maximum number of connections taken from a manifold is 12 including spares.
Manifolds shall be accessible from grade or from a platform.
Pockets in steam tracers shall be avoided as far as possible.
Tracers shall be limited to the following run length upstream of traps.
Size of tracer
(inch)
Length of tracer pipe (Meters)
Steam operating pressure
20psig 50psig 100psig 150psig 200psig &
above
½" 23 38 46 53 61
Tracers shall generally be of ½”. Tracers shall be of CS steel seamless pipe and valves on the
steam tracing circuit including steam station block valve shall be glandless piston valve.
Size of the lead line to manifold shall be as follows:
Number of connections Size of Lead Line
2 ¾”
3 1”
4-6 1 ½”
7-12 2”
The lead line to manifold, manifold up to the block valves of individual tracer shall be carbon
steel of IBR quality.
Tracer lines shall be provided with break up flanges for main line flange joints and valves.
All tracers shall have individual steam traps before condensate manifolds. Condensate
manifold including the last valve on individual tracer shall be of carbon steel.
All steam traps discharging to a closed system shall have a block valves upstream and
downstream of the trap. A bypass globe valve shall be installed around the trap. Check valve
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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shall be installed on the downstream of the steam trap near the condensate header in case
discharging to a closed system.
All steam tracer lines shall be welded as per approved Welding Specification followed by hydro
test.
All steam tracer lines up to 1-1/2” size shall be welded using GTAW welding process followed
by hydro-test.
Number of tracers required on a line shall be as follows:
Size of Line Number of Tracers
Up to 4” 1
6” to 16” 2
18” to 24” 3
26” & above To calculate
3.2.12.2 Steam Jacketing System (If applicable)
A Steam Jacketed pipe consists of a product line, which passes through the center of a larger
diameter steam line.
The normal size of the inner pipe (CORE) and outer pipe (JACKET) in inches shall be as per
table below unless otherwise mentioned in project piping material specification (PMS) or P&ID.
Core pipe will be of SS material only.
Core pipe Jacket pipe
¾” 1½”
1 2”
1½” 3”
2” 3”
3” 4”
4" 6"
6" 8"
8" 10"
10" 12"
Distance between steam inlet and condensate outlet shall be similar to steam tracing system.
Baffle plates, flanged joints or end caps shall be used to discontinue one feed length from the
next. The size of steam feeder to jacket shall be generally ½" or as specified in job
specification.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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Flanged jumpovers shall be used in case of Flanged joint. In case of discontinuous jacketing
simple jumpovers shall be employed. The length of jacket shall be 4 to 5 meters or as
mentioned in job specification.
Intermediate partial baffles shall be provided if a separate branch portion is to be heated from
the main line stream.
Steam inlet to jacket shall generally be provided from top of the pipe in case of horizontal lines.
The jumpovers and condensate outlets shall be from the bottom.
In case of vertical lines steam inlet shall be done at the topmost points and condensate outlet
shall be done from the lowest possible points. Two consecutive jumpovers shall be 180 deg
apart.
Each feed length shall be provided with individual trap before connecting to condensate
recovery headers.
Balanced pressure / bi-metallic type thermostatic steam traps shall be used in jacketing as well
as steam tracing.
To keep proper concentricity between core and jacket pipe internal guides (rods or flat bars)
shall be provided at intervals depending on the size of the pipe.
Wherever anchors are provided on jacket lines proper interconnection of jacket pipe and core
pipe shall have to be provided with proper Jumpovers for steam.
3.2.13 UTILITY STATIONS
Requisite number of Utility Stations shall be provided throughout the unit to cater for the utility
requirement. Utility Stations shall have two connections (one for Plant Air, one for Service
Water and one Low Pressure Steam each of 1") unless otherwise specified in P&ID. All
connections shall be directed downward. All connections shall have globe valve for isolation
purpose. All connections shall have ends flanged with threaded nipple for hose connections. Air
and water lines shall have quick type hose connection and steam line shall have flanged type
hose connection.
Number of Utility Stations shall be such that all equipment shall be approachable from at least
one Utility Station. The approach of Utility Station shall be considered 15m all around the
station location.
The Utility Stations shall generally be located adjacent to pipe-rack column. The Utility Stations
shall also be provided on elevated structures, operating platforms of vertical equipments etc.
Operating platforms having manholes must have a Utility Station.
Spares required for utility stations are generally as described in ‘mandatory spare list ‘.
3.2.14 FIRE FIGHTING
All Fire fighting facility shall be as per OISD / TAC- fire protection manual and shall conform to
the scope of work, enclosed in the BID.
3.2.15 INSULATION AND PAINTING
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 24 of 50
For Insulation, Painting and Colour coding, Engineering Design Basis provided else where in
the BID, shall be followed.
3.3 OFFSITE & YARD PIPING (If applicable)
Battery limit integration to the main process block shall be through multi tier pipe rack and
sleepers (either existing or new). Battery limits and tie-in points to be clearly marked and shall
be routed economically and as to satisfy process requirements.
In general, the pipes shall be laid at grade level on sleepers of concrete 450 mm high from
grade level. Pipe sleepers shall have hard surfacing. Hard surfacing should be completed
before start of pipe laying. Width of hard surfacing shall be about 1m more than the piping
corridor. This extra hard surfacing shall be for the movement of operating personnel along the
pipe corridor. At every 500 m approach to be provided from the road for hard surfacing area.
Pipe rack/portals may be used depending upon requirement, if adequate space is not available
for sleepers. Modification of existing sleepers shall be done if required. The exact level shall be
decided during detail engineering depending on requirements.
However, existing/modified pipe rack around Unit block shall be suitably used.
Pipes at road crossing shall be under culverts in general. All process lines & steam lines if
required to be routed below the road, the same shall be routed through culvert at the road
crossing.
Overhead pipe bridges may be used for areas where pipe racks are provided with minimum
clearance as per Annexure B.
Clearances between lines shall be minimum "C" as given below.
C = (d0 + Df)/2 + 25 mm + Insulation thickness
Where. ‘d0 = outside diameter of smaller pipe (mm)
Df = outside diameter of flange of bigger pipe (mm)
Adequate clearances shall be provided for very long & high temperature lines to avoid clashing
at the bends.
Expansion loops for all lines shall generally be kept at the same location.
Vents shall be provided on all high points and drains shall be provided at all low points.
Drain valve shall be suitably located for ease of operation. Drain valves at sleeper piping shall
be kept outside the sleeper way. If the same is not accessible and valves shall be put in
horizontal only. At all such places where piping is extended to make drain valves accessible, 2
no. of stiffeners, irrespective of pipe rating shall be provided.
Spacing of guides on each line on a pipe bay shall not exceed the value given in Annexure C.
3.4 TANK FARM PIPING ( If applicable)
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 25 of 50
The number of pipelines in the tank dyke shall be kept at minimum and shall be routed in the
shortest practicable way to main pipe track outside the tank dyke, with adequate allowance for
expansion. Within one tank dyke the piping connected to that tank shall only be routed.
Manifolds shall be located outside the tank dyke and by the sides of the road, easily accessible
by the walkway.
Analysis shall be carried out to prevent damage to lines and tank connection caused by tank
settlement.
If exceptionally high settlement is expected "dressers coupling" or "flexible ball joint" may be
provided.
For flexibility analysis and supporting refer clause 3.8
Special consideration shall be given as regards to spacing of nozzles while installing special
item like hammer blind, Motor Operated Valves etc.
Tank connections to be done after tank hydro testing.
3.5 UNDERGROUND PIPING
Services for underground piping.
• OWS
• CRW
• Sanitary sewer system.
All underground C.S .Pipes shall be painted/ coated as per painting/coating specification provided else where in the BID.
All underground C.S pipes shall be provided with corrosion resistance protection as per the
specification for coating & wrapping.
1. Surface preparation: Abrasive blast cleaning SA 2 ½ followed by Tape primer
(supplied by Tape manufacturer).
2. Poly Ethylene Tape (M/s.Denso) / PVC Tape (M//s. Rustech ) 3 mm thick tape
coating
3. Holiday testing after tape coating
Corrosion resistance protection given to underground C.S. pipes shall extend up to 500mm
above/beyond grade on both sides
To the extent possible, fire water header shall be laid above ground except around process
area where it shall be laid underground .In case it is to be laid U/G, it shall be laid in RCC
trenches covered with pre-cast RCC slabs in RCC paved area, whereas in unpaved area it
shall be laid directly buried.
All underground-buried firewater piping shall be externally protected from corrosion by
wrapping & coating as per the specifications provided else where in the BID.
3.6 VENTS AND DRAINS
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 26 of 50
Process Licensor’s requirements are to be followed for the size and type of vents and drains
and all shall be as per PID’s approved by PMC. All hydrocarbon drain & vents shall have valves
with blind flanges at other end.
Identification marks for location /visibility of drain points of off-site piping should be provided. All
drain points should be approachable and clearly visible.
3.7 FLEXIBILITY ANALYSIS AND SUPPORTING
Stress Design Basis’ provide else where in the BID, shall be referred.
3.8 FLARE PIPING
Flare header shall be sloped towards flare knockout drum. Only horizontal loop shall be provided as per requirement to accommodate thermal expansion. The desired slope shall be ensured throughout including flat loop. Flare header shall be supported on shoe of height ranging from 100 mm to 300 mm.
Proper thermal analysis temperature shall be established including the possibility of temperature gradient along the line before providing expansion loops.
Flare piping to offsite shall be provided with guide support on all around the pipe to prevent it falling off from the flare trestles.
Flare header valve stems shall be in vertical downward position.
Valves in Flare Header shall be of Gate Type only.
3.9 MATERIALS AND SELECTION OF PIPES AND FITTINGS
The PMS (Piping material specifications) provided by PMC are only for reference and
indicative and thus may not be exhaustive. LSTK shall update PMS given in the BID and
develop detailed piping material specifications (PMS) and Valve Data sheets (VMS), based
on process Licensor’s piping specifications, basic material depending upon service conditions
(temperature, pressure and corrosively etc.) as spelt in process package.
3.9.1 Pipe
Wall thickness
Calculation of pipe thickness and branch reinforcement shall be based on requirements of
ASME B 31.3. /IBR as applicable. Proper corrosion allowance and mill tolerance shall be
considered while selecting thickness.
For carbon steel and low alloy steel pipes (expect for steam tracing piping) minimum pipe
thickness shall be as follows:
'S160' up to 0.75"NB,
'XS' for 1” to 2” NB
'STD' for above 2NB.
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For Stainless Pipes minimum pipe thickness shall be: -
80S up to 0.75” NB
40S for 1” to 2” NB
10S for above 2” NB
The philosophy of minimum thickness/schedule is applicable for both seamless and welded
pipes.
The above-mentioned minimum thickness/schedule criterion is not applicable to category -D
fluid where IS pipes or welded API 5L pipes are being used.
All pipes (seamless & welded) shall have uniform negative wall thickness tolerance of 12.5% for
wall thickness calculations purpose, except for pipes made out of plate material, where relevant
ASTM code shall govern.
For thickness exceeding minimum thickness/schedule criteria, schedule XS shall be selected
for CS & AS classes (for 2" & above). Intermediate schedules between STD & XS shall be
ignored. Similarly for SS classes (2" & above) S10, S20, S30 & 40S may be selected beyond
minimum thickness/schedule criteria.
If, the thickness exceeds XS in CS & AS classes and 40S in SS classes, only then, the
thickness shall be calculated based on actual service conditions subject to a minimum of 80%
class rating. Maximum 10% of corrosion allowance may be reduced in special cases, to
optimize the pipe schedules.
In general the pressure-temperature combination to calculate wall thickness shall be as follows:
Material Class Pipe Size Design condition
150 Up to 24" Class condition
Above 24" Line condition (//)
300 Up to 14" Class condition
Above 14" Line condition (//)
600 Up to 8" Class condition
Above 8" Line condition (//)
900 Up to 8" Class condition
Above 8" Line condition
1500&2500 Up to 4" Class condition
C.S.
(A 106 GR.B, API 5L
GR.B, A672)
LTCS
(A333 GR 6)
Low alloys
1.25%Cr-05%Mo
2.25%Cr-1.0%Mo
5%Cr.-0.5%Mo. Above 4" Line condition
150 Up to 24" Class condition
Above 24" Line condition $
300 Up to 14" Class condition
Above 14" Line condition $
600 Up to 6" Class condition
Above 6" Line condition $
900,1500 Up to 4" Class condition
S.S. (A312 TP304,
TP304L, 316L, 347)
OR
(A358 TP304, 304L
316,316L, 321,347)
Above 4" Line condition
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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2500 Up to 2" Class condition
Above 2" Line condition
150 Up to 6” Class condition
Above 6" Line condition
Higher Alloys
300 -2500 All sizes Line condition
// Only if the thickness/schedule as per class condition exceeds XS.
$ Only if the thickness/schedule as per class condition exceeds 40S.
For other than Category D classes ‘D/t’ ratio shall be restricted to generally 100(Max), up to size
of 48”,’D’ is nominal dia. and‘t’ is nominal thickness. For sizes 50”and above’D/t’ ratio shall be
decided by job engineer. For Cat-D Classes, for above ground applications ‘D/t ’ratio shall be
taken, as 150, ‘t’ is min. calculated thickness excluding corrosion and manufacturing tolerance.
Pipe size
Pipe size shall normally be ½", ¾", 1", 1½", 2", 3", 4", 6", 8", 10", 12", 14", 16", 18", 20", 24",
26", 30", 36", 40", 44", 48", 52", 56", 60", 64", 72", 78", 80".
Pipe type
Material Size Type
Up to 14” Seamless
CS & LTCS, AS (except for Category ‘D’
fluids)
10” and Above EFW
SS (Process Lines)
Up to 1½" Seamless
SS (Non Process Lines)
2" & Above Welded
CS (Category ‘D’ fluids)
* Except for fire water and cooling water
services, for which following shall apply:-
1. Up to 6” NB - Seamless
2. 8” NB and above - Welded
3. Less than 3” NB - Carbon steel
( Higher schedule )
4. 3 inch NB and above - Carbon Steel
(Cement Lined)
ALL
Welded *
3.9.2 Fittings
Type of fittings shall be equivalent to pipe type.
1
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Thickness of fittings at ends to match pipe thickness for BW fittings
SW fittings shall be 3000#, 6000#, and 9000# depending on the pipe thickness S80, S160 and
above S160 respectively.
Up to 600# all branch connections shall be as follows, unless specifically mentioned otherwise
in PMS.
Up to 1½" NB Half Coupling / Tee
2" and above Tee/ Pipe to pipe with / without
reinforcement pad
For branch connection above 600# rating equal tee/unequal tee shall be used for all sizes.
Unequal tee may be replaced by weld-o-let up to branch size of 8".
Miters shall be used in Category ‘D’ service above 6"NB. For other than category ‘D’ fluids in
150#, 300# classes’ miters may be able to be permitted for sizes above 48" only. Miters to be
designed as per ASME B 31.3.However use of miters shall be minimum.
3.9.3 Flanges:
Flanges:
Flanges shall be as follows: Class Size Type Remarks
Up to 1½" SW RF If non-metallic gasket used.
Up to 1½" WN RF If metallic gasket used.
2" & above WN RF/LJ FF For SS LJ FF + Stub ends
150#
2" & above SO RF If used in Category ‘D’ service
300#, 600# Up to 1½" SW RF
2" & above WN RF
900#, 1500#, 2500# All WN RTJ
All flange joints on piping system including flanges on equipment, manhole, etc shall be tightened using torque wrench/ hydraulic bolt tensioner depending upon service criticality.
3.9.4 Gaskets.
Gaskets to be provided as per service condition as mentioned in PMS.
3.9.5 Valves
SW valves up to 1½ inch – up to 600# ANSI Class except ball and plug valves which shall be flanged for all sizes.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 30 of 50
Flanged cast valve above 1½" – 150#, 300#, 600# ANSI Class
BW valves all sizes-900# ANSI Class & above No CI valves to be used.
Over and above requirements, other technical requirement prescribed in Annexure E shall also be adhered to.
3.10 NON DESTRUCTIVE TESTING REQUIREMENTS
Depending on the severity of application, extent of NDT shall be decided. As a rule, all
hydrogen, oxygen, NACE and any other lethal service shall have 100% radiography on weld
joints. Castings used in these services shall have 100% radiography. For high-pressure
applications i.e. 600# upward 100% radiography on weld joints shall be employed. In 100%
radiography classes any fillet welds employed shall have 100% MP in CS/AS classes and
100% DP in SS classes. Category ‘D’ service shall have 2% radiography. Classes in 150#
for normal hydrocarbon service shall be subjected to 10% radiography and SW/Fillet
weld/attachment weld where radiography is not possible shall be 10% DP/MP tested.
Classes in 300# for normal hydrocarbon service shall be subjected to 20% radiography and
SW/ Fillet weld/attachment weld where radiography is not possible shall be 20% DP/MP
tested.
All AS pipes, fittings, flanges, valves & bolts shall undergo Positive Material Identification
(100%) at site. All the PMI test at construction site shall be done as per standard.
3.11 STRAINERS
3.11.1 Temporary Strainers:
1½" & below for all services shall by Y-type
2" & above for steam service shall by Y-type
2" & above for other than steam services shall by T-type
3.11.2 Permanent strainers
Compressor suction, cold box inlet strainers shall be cone type with reinforced perforated
sheet cage design
1" & above permanent strainer shall be as per process data sheet
3.12 WELDING
3.12.1 Applicable codes and standards
All welding work, equipment for welding, heat treatment, other auxiliary functions and the
welding personnel shall meet the following requirements of the latest edition of following
accepted standards and procedures.
Process piping – ASME B 31.3
In addition, the following codes and specification referred in the code of fabrication shall be
followed for the welding specifications, consumables, qualifications and non-destructive test
procedures.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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Welding and Brazing qualifications – ASME BPV Sec IX
Non Destructive Test - ASME BPV Sec V
Material specification: welding rods, electrodes, and filler metals – ASME BPV Sec II part
C The additional requirements mentioned in this specification, over and above those obligatory
as per codes, shall be followed wherever specified.
3.12.2 Welding processes
3.12.2.1 Welding of various materials shall be carried out using one or more of the following
Shielded Metal Arc Welding process (SMAW)
Gas Tungsten Arc Welding (GTAW)
3.12.2.2 Automatic and semi-automatic welding shall be employed only with the approval of the
Owner. The welding procedure adopted and consumables used shall be specifically
approved.
3.12.2.3 All steam tracing line to be welded with TIG welding process and subjected to hydro test
prior to commissioning.
3.12.2.4 A combination of different welding processes could be employed for a particular joint only
after duly qualifying the welding procedure to be adopted and obtaining the approval of
Owner.
3.12.2.5 For additional details "welding specification for fabrication of piping” / welding charts shall be
referred.
4.0 REFERENCED PUBLICATIONS
The following latest codes and standards shall be followed unless otherwise specified.
ASME SEC. I - Rules for Construction of Power Boilers.
ASME SEC. VIII
- Rules for Construction of Pressure Vessels.
ASME B31.1 - Power piping.
ASME B31.3 - Process piping.
ASME B 31.8 - Guide for Gas Transmission and Piping distribution system
ANSI/NEMA
SM 23
- Steam turbines for mechanical drive service.
API RP 520 - Sizing, selection and installation of Pressure relieving devices in
Refineries.
API Std. 560 - Fired heaters.
API Std. 610 - Centrifugal pumps for Petroleum, Heavy-duty chemical and gas
industry service.
API Std. 617 - Centrifugal compressors for petroleum, chemical and gas industry
service.
API Std. 618 - Reciprocating Compressors
API Std. 661 - Air cooled heat exchangers
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 32 of 50
EJMA - Expansion joints Manufacturers’ Association.
NACE
MR-0175
- Sulphide Stress cracking resistant metallic materials for oilfield
equipment.
NACE
TM-
0177
- Laboratory testing of metals for resistance to Sulphide Stress
cracking in H2S Environments.
NACE
MR-
0284
- Evaluation of pipeline and pressure vessel steel for resistance to
Hydrogen Induced Cracking.
IBR - Indian Boiler Regulations
TAC - Tariff Advisory Committee.
OISD - Oil Industry Safety Directorate.
OISD 118 - Layouts for oil and gas installation.
OISD 116 - Fire protection facilities for petroleum refineries and oil/gas
processing plants.
OISD 113 - Classification of area for electrical installation at hydrocarbon and
handling facilities.
OISD 164 - Fire proofing in Oil & Gas industry
IS 5572 - Classification of Hazardous area (other than mines) for electrical
installation.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 33 of 50
ANNEXURE A
Accessibility for valves and instruments
Valves, instrument, equipment to
be operated
Centerline of item to be operated,
located less than 3.6 m above
grade, 2.75m above floor or
platform or 1.8m above wing
platform.
Centerline of item to be
operated, located more than
3.6 m above grade, 2.75m
above floor or platform or
1.8m above wing platform.
Exchanger heads Nil Platform
Oper. Valves 2" & smaller Fixed ladder Fixed ladder
Oper. Valves 3" above Platform Platform
Motor operated valves Platform Platform
Control valves Platform Platform
Relief valves 2" & smaller Fixed ladder Fixed ladder
Relief valves 3" & above Platform Platform
Block valves 2" & smaller Portable ladder Platform
Block valves 3" & above Platform note – 1 Platform
Battery limit valves Platform Platform
Pressure instrument Fixed ladder if above 2.2 m Fixed ladder
Temperature instrument Fixed ladder if above 2.2 m Fixed ladder
Sample points Platform Platform
Gauge glasses Fixed ladder Platform
Level controllers Platform Platform
Process blinds and spades 2" &
above
Portable ladder/platform Platform
Process blinds and spades 3" &
above
Platform Platform
Man ways / manholes Platform Platform
Manholes / inspection holes Platform Platform
Nozzles Access required Platform
Vessel vents Portable ladder Fixed ladder
Line drains & vents Portable ladder Portable ladder
Orifice flanges Portable ladder Portable ladder
Note: - 1. Centerline or block valves located above 2.0 meter from the operating floor, which are
required for normal operation, shall be provided with portable platform or chain for operation of valves.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 34 of 50
ANNEXURE B
CLEARANCES
Equipment, Structure, Platforms, Piping & its supports shall be arranged so as to provide the following
clearances.
A OVERHEAD CLERANCES
1. Over rail roads, top of rail to bottom of any obstruction. 9 m
2. Over plant roads for major mobile equipment 9 m
3. Over grade & bottom of pipe (inside battery limit) 4.5 m
4. Over walk-ways, pass-ways & platforms to nearest
obstruction and inside building
2.2m
5. Over Exchangers at Grade, shell cover channel end. 1.5 m
B. HORIZONTAL CLEARANCES
1. Between Exchangers (Aisles between Piping). 0.9 m or 2m centre to centre
whichever is higher
2. Around Pumps (Aisles between piping) 0.9 m
3. Fired heaters to pumps handling flammable stock 15 m
4. Fired heaters to other flammable containing equipment and
closely associated with heaters.
15 m
5. At driver end of pumps where truck/fork lifter access is
required.
4 m
6. At driver end of pumps where truck access is not required. 1.8 m
7 At shell cover end of exchangers at grade, for access way 1.3 m
8 Between shells of adjacent horizontal vessels 2.0 m or 0.9m clear aisle
whichever is higher
C EQUIPMENT SPACING
1. Small size pumps
(13.7 KW & Less)
Mount on common
foundations suitable centre to
centre distance.
2. Middle size pumps
(22.5 KW & Less)
0.9m clears Aisle between
associated piping.
3. Large size pumps
(Above 22.5 KW)
0.9m clears Aisle between
associated piping.
4. Exchangers and other equipment on structures 0.9m clears Aisle between
associated piping.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 35 of 50
D PLATFORMS
1. TOWERS, VERTICAL & HORIZONTAL VESSELS
i. Distance of platform below centerline of
manhole flange-side platform.
0.9-1.05 m
ii. Width of manhole platform from manhole
cover to outside edge of platform
1.0 m
Iii Platform extension beyond centre line of
manhole – side platform.
1.0 m
iv. Distance of platform below under side of
flange – Head platform
1.75 m
v. Width of Platform from three sides of
manhole – Head platform
0.75 m
2. HORIZONTAL EXCHANGER
i. Clearance in front channel or Bonnet
flange.
1.3 m
Ii Heat exchanger tube bundle removal
space.
Bundle length + 1.5 m
Iii Min. clearance from edge of flanges. 0.1 m
3. VERTICAL EXCHANGER
i. Distance of platform below top flange of
channel on bonnet.
1.5 m
4. FURNACES
i. Width of the platform at side of horizontal
and vertical tube furnace.
2.0 m Min.
Ii Width of the platform at ends of horizontal
tube furnace.
2.0 m Min.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
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ANNEXURE C
Vertical and Horizontal Guide Spacing
Pipe Size (Inch) Guide Spacing in meters
Vertical Horizontal
1 6 6
1½ 6 6
2 6 6
3 8 12
4 8 12
6 8 12
8 8 12
10 12 18
12 12 18
14 12 18
16,18 12 18
20 16 18
24 16 18
26 and above 16 18
Notes:
These spacing may be varied to suit column spacing of rack. The above spacing is for straight runs of
pipe and does not include guides, which are used for control of thermal movements, as decided by
stress group.
The guide spacing given in the above table is indicative only.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 37 of 50
ANNEXURE D Table of Basic Span
PIPE-VAPOR INSULATION
PIPE-LIQUID-INSULATION
BARE PIPE EMPTY
BARE PIPE WATER FILLED
BASIC SPAN (L) m
BASIC SPAN (L) m
Pipe Size Inch
SCH. THK mm
Up to 175°C
176° to 345°C
446°
C to 400°
C
Up to 175°C
176°C to 445°C
346°C to 400°C
SPAN (L) m
Weight Kg/m
SPAN (L) m
Weight Kg/m
Pipe Size Inch
¾ SCH 40 3.5 3.5 2.5 3.5 3.0 2.0 4.5 1.68 4.0 2.04 ¾ 1 SCH 40 4.5 4.0 3.0 4.5 3.5 3.0 5.0 2.52 4.5 3.07 1 1½ SCH 40 5.0 5.0 4.5 5.0 4.5 3.5 6.0 4.0-8 5.0 5.4 1½ 2 SCH 40 5.5 5.0 4.5 5.0 4.5 3.5 6.5 5.47 5.5 7.65 2 2½ SCH 40 6.5 6.0 5.0 6.0 5.5 4.5 7.5 8.7 6.5 11.79 2½ 3 SCH 40 7.5 6.5 5.5 6.5 6.0 5.0 8.0 11.35 6.5 16.15 3 4 SCH 40 8.0 7.5 6.5 7.5 7.0 6.0 9.0 16.2 7.5 24.45 4 6 SCH 40 10.0 9.5 8.5 9.0 8.0 7.5 10.5 28.3 9.0 46.7 6 8 SCH 40 12.0 11. 10.0 10.0 10.0 9.0 12.0 42.84 10.0 75.22 8 10 SCH 40 13.5 13. 12.0 11.5 10.5 10.5 14.0 60.74 11.5 111.9 10 12 3/8" w 14.5 13. 13.0 12.0 11.5 11.0 15.0 74.40 12.0 147.5 12 14 3/8" w 15.0 14. 13.5 12.0 12.0 11.5 16.0 82.5 12.5 172.05 14 16 3/8" w 16.0 15. 14.5 13.0 12.5 12.0 17.0 94.5 13.0 213.15 16 18 3/8" w 17.0 16. 15.0 13.5 13.0 12.0 18.0 106.5 13.5 258.3 18 20 3/8" w 18.0 17. 16.0 14.0 13.5 12.5 19.0 118.5 14.0 307.5 20 24 3/8" w 20.0 19. 17.5 14.5 14.5 13.0 21.0 142.5 15.0 418.2 24 ¾ SCH 80 3.5 3.5 2.5 3.5 3.0 2.0 4.5 2.20 4.0 2.49 ¾ 1 SCH 80 4.5 4.0 3.0 4.5 3.5 3.0 5.0 3.25 4.5 3.72 1 1½ SCH 80 5.0 5.0 4.5 5.0 4.5 4.0 6.0 5.45 5.0 6.60 1½ 2 SCH 80 6.0 5.0 4.5 5.5 5.0 4.0 6.0 7.53 6.0 9.45 2 2½ SCH 80 6.5 6.0 5.5 6.0 6.0 5.0 7.5 11.49 6.5 14.25 2½ 3 SCH 80 7.5 6.5 6.0 6.5 6.5 6.0 8.0 15.37 7.0 19.66 3 4 SCH 80 8.0 8.0 7.0 7.5 7.5 6.5 9.0 22.47 8.0 29.94 4 6 SCH 80 10.5 10. 9.0 9.5 9.0 8.5 10.5 42.90 9.5 59.85 6 8 ½" w 12.0 11. 10.5 10.5 10.0 10.0 12.0 65.10 11.0 94.8 8 10 ½" w 13.5 13. 12.0 11.5 11.5 10.5 14.0 82.20 12.0 130.69 10 12 ½ "w 14.5 13. 13.0 12.5 12.0 11.5 15.0 98.13 13.0 168.64 12 14 ½ "w 15.0 14. 13.5 13.0 12.5 12.0 16.0 108.1 13.5 194.4 14 16 ½ "w 16.0 15. 15.0 13.5 13.0 13.0 17.0 124.2 14.0 240.0 16 18 ½ "w 17.5 17. 16.0 14.5 14.0 13.5 18.0 140.2 14.5 286.64 18 20 ½" w 18.0 17. 17.0 15.0 14.5 14.0 19.0 157.0 15.0 341.8 20 24 ½" w 20.0 19. 18.5 16.0 15.0 15.0 21.0 188.2 16.0 458.44 24 1 10S 4.0 3.5 3.0 4.0 3.0 2.5 4.5 2.08 4.0 2.7 1 1½ 10S 5.0 4.5 3.5 4.5 4.0 3.0 5.5 3.12 5.0 4.57 1½ 2 10S 5.0 4.5 3.5 4.5 4.0 3.0 6.0 3.94 5.5 6.63 2 2½ 10S 6.5 5.5 4.5 5.5 5.0 4.5 7.0 5.26 6.0 8.85 2½ 3 10S 7.0 6.0 5.0 6.0 5.5 5.0 7.5 6.45 6.0 11.91 3 4 10S 7.5 7.0 6.0 6.5 6.0 6.0 8.0 8.34 7.0 17.67 4 6 10S 9.5 9.0 8.0 8.0 7.5 7.5 10.0 13.82 8.5 34.54 6 8 10S 11.0 10. 10.0 9.5 9.5 8.5 11.5 19.94 10.0 55.5 8 10 10S 12.5 12. 11.0 10.5 10.0 9.5 13.0 27.83 11.0 83.4 10 12 10S 14.0 13. 12.0 11.0 11.0 10.0 14.5 36.00 11.5 114.6 12 14 10S 14.5 14. 13.0 11.5 11.0 11.0 15.5 41.18 11.5 132.6 14 16 10S 16.5 14. 14.0 12.0 11.5 11.5 16.5 47.33 12.5 172.2 16 18 10S 16.5 15. 14.5 12.5 12.5 11.5 17.5 53.18 13.0 212.1 18 20 10S 17.5 16. 15.5 13.0 13.0 12.0 18.5 68.50 13.0 264.5 20 24 10S 19.0 18. 17.0 14.0 13.5 12.5 20.5 94.37 14.0 376.8 24
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 38 of 50
ANNEXURE E
TECHNICAL REQUIREMENTS OF PIPING MATERIAL
1.0 Ends
Unless otherwise specified the ends shall be to the following standard:
SW/SCRD ASME B16.11
BW ASME B16.25 / B16.9
FLANGED ASME B16.5 and ASME B16.47 SERIES ‘B’/API-605
THREADING ASME/ANSI B1.20.1 (NPT, Taper threads)
2.0 Face Finish
This shall be to MSS-SP-6/ASME B46.1/ ASME B16.5. The interpretation shall be :
Stock Finish 250-1000 µ in AARH
Serrated Finish 250-500 µ in AARH
Smooth Finish/125 AARH 125-250 µ in AARH
Extra Smooth Finish /63 AARH 32-63 µ in AARH
3.0 Austenitic Stainless Steel
All items/ parts shall be supplied in solution-annealed condition.
Intergranular Corrosion (IGC) Test shall be conducted as per following:
ASTM A262 Practice ‘B’ with acceptance criteria of 60-mils/ year (max.) for casting.
ASTM A262 Practice ‘E’ with acceptance criteria of ‘No cracks as observed from 20X
magnification & microscopic structure to be observed from 250X magnification" for other
than casting.
For IGC test, two sets shall be drawn from each solution annealing lot: one set
corresponding to highest carbon content and other set corresponding to the highest
rating/ thickness.
IGC test is a must for all stainless steel classes.
For all items of stabilized SS grades, stabilizing heat treatment shall also be done. It shall
be carried out subsequent to normal solution annealing. Soaking temperature and holding
time shall be 900 Deg. C and 4 hours respectively.
4.0 Item specific notes:
4.1 Pipes
Double seam is allowed for sizes 36" and larger.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 39 of 50
Galvanized pipes shall be only Hot Dip galvanized To ASTM A53.
Pipes greater than 10" spiral welded/ pipe shall be used weld seams to be kept in upper
quadrant only.
4.2 Fittings
All fittings shall be seamless in construction unless otherwise specified.
For reducing BW fittings having different wall thickness at each end, the greater one shall
be employed and the ends shall be matched to suit respective thickness.
All welded fittings shall be double welded. Inside weld projection shall not exceed 1.6
mm, and the welds shall be ground smooth at least 25mm from the ends.
For fittings made out of welded pipe, the pipe itself shall be of double welded type,
manufactured with the addition or filler material and made employing automatic welding
only.
All welded fittings shall be normalized for CS, normalized & tempered for AS: and 100 %
radiographed by X-ray for all welds made by fitting manufacturer as well as for welds on
the parent material.
Bevel ends of all BW fittings shall undergo 100 % MP/DP test. Those used in fire fighting
facility should be marked
Tell-tale hole to be tapped in all reinforcement pads.
4.3 Flanges
For Ring Joint Flanges, Blinds and Spacers, the hardness shall be as follow:
Flange Material Min. hardness of Groove
(BHN)
Carbon Steel 120
1 % Cr. To 5% Cr. ½ Mo 150
Type 304,316, 347, 321 180
Type 304 L, 316 L 140
For RTJ flanges, blinds & spacers, the hardness of the groove shall be specified on the
test report.
Bore of weld neck flange shall correspond to the inside diameter of pipe for specified
schedule/ thickness. Ends shall be beveled to suit the specified schedule/ thickness.
All flange joints to be tightened with proper gaskets, bolts & nuts with skilled technician
and box-up of flange joints to be documented.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 40 of 50
4.4 Valves
Valves of Class 900# & above shall be pressure-seal type. Threaded and seal welded or
welded bonnet may be employed up to sizes 1-1/2".
All flanged valves (except forged) shall have flanges integral with the valve body.
Yoke material shall be at least equal to body material.
Forgings are acceptable in place of Castings but not vice-versa.
No cast iron valves to be used in fire fighting or any other service except in drinking water
service
Valve castings/ forgings purchased from India or Indian Vendors shall be from Owner
approved foundries/ forging shop.
4.5 Dimensions
Face-to-Face/End-to-End dimension shall be as per ANSI B16.10. In case the same is
not covered under B16.10, the dimension shall be as per BS 2080/Manufacturer’s Std.
Valve under cryogenic service (temp.below-45°C) shall be as per BS-6364 and shall be
procured from pre-qualified vendor.
4.6 Operation
Generally the valves are hand wheel or lever operated. However, suitable gear operator
in enclosed gear box shall be provided for valves as follows;
TYPE OF VALVE ANSI CLASS SIZES
Gate 150
300
600
900
1500
2500
14" and larger
12" and larger
8" and larger
6" and larger
4" and larger
2" and larger Ball 150 and 300
600 and over
6" and larger
Manufacturer's Std.
Plug 150
300
8" and larger
6" and larger
Butterfly all 8" and larger
Globe 150 and 300
600
900
1500 and 2500
8" and larger
6" and larger
4" and larger
3" and larger
Hand wheel diameter shall not exceed 750 mm and lever length shall not exceed 500 mm
on each side. Effort to operate shall not exceed 35 kgf at hand wheel periphery.
However, failing to meet the above requirement, vendor shall offer gear operation.
Quarter-turn valves shall have "open" position indicators with limit stops.
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 41 of 50
4.7 By pass
A globe type valve (size as per ASME/ANSI B16.34) shall be provided as bypass for the
following sizes of gate valves:
Class For sizes
150 # 26" and above
300 # 16" and above
600 # 6" and above
900 # 4" and above
1500 # 4" and above
2500 # 3" and above
By-pass piping, fitting and valves shall be compatible material and design. Complete fillet
welds for by-pass installation shall be DP/MP tested. NDT of by-pass valve shall be inline
with main valve.
4.8 Radiography of cast valves
Unless specified otherwise, the following valve castings shall undergo radiographic
examination (for all materials):
Class Size Qty.
150 # 26" & above 100 % (Except for Cat. ‘D’
service)
300 # 18" & above 100 %
600 # & ABOVE All 100 %
For Hydrogen, Oxygen, NACE, Stress relieved, Caustic service, additional radiography
requirements shall be as follows (Over & above the requirements covered under Para.
above):
150 # Up to 24" 50 %
300 # Up to 16" 50 %
For CRYO/Low temperature classes, additional radiography requirements shall be as follows
(Over & above the requirements covered under Para. ‘A’ above):
150 # Up to 24" 20%
300 # Up to 16" 20%
For alloy steel, Stainless steel castings (not covered in Para B&C above) shall be additionally
radiographed as follows:
150 # Up to 24" 10%
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 42 of 50
300 # Up to 16" 10%
Radiography procedure, areas of casting to be radiographed, and the acceptance criteria
shall be as per ASME/ANSI B16.34.
All casting in class 300 # & above shall be radiographic quality casting. This requirement to
be ensured by sample radiography before proceeding with the actual production
4.9 Ball/plug/butterfly valves
Each valve shall be supplied with a lever/wrench except for gear operated/ motor operated
valves.
Soft-seated Ball, Plug & Butterfly valves shall be supplied and antistatic devices.
All Ball; Plug & Butterfly valves shall be fire safe to atmosphere.
The ball of Ball Valves shall not protrude outside the end flanges.
Ball valves shall be floating ball type/ trunion mounted type as per following:
Plug valves, if used shall be of pressure balanced type
Class Floating Ball Trunion Mounted
150 # 8" & below 10" & above
300 # 4" & below 6" & above
600 # & above 1 ½ & below 2" & above
Use of soft-seated ball/plug/butterfly valves shall be suitably selected based on temperatures
handled. Butterfly valve shall be suited for throttling application.
4.10 Strainer
Allowable pressure drop shall be certified by vendor along with the offer. If asked
specifically, vendor shall furnish pressure drop calculations.
All 2" & higher sized Y type strainer shall be provided with ¾" threaded tap and solid
threaded plug as drain connection. For less than 2", this shall be ½" size.
Bottom flange of Y-type strainer shall not have tapped holes. Full length standard size studs
shall be used for joining blind flanges
For fabricated strainers, all BW joints shall be fully radiographed and fillet welds shall be 100
% DP/MP checked.
All the strainers shall be hydrostatically tested at twice the design pressure.
4.11 Traps
Jacobs HPCL, Mumbai Piping Design Basis Part- III LSTK Doc NO : 44LK-5100-0/L.02/0002/A4 Section - A 44LK 5100
Sheet 43 of 50
Vendor shall also furnish the performance curve indicating the capacity in mass/hour at
various differential pressures across the trap.
Parts subject to wear and tear shall be suitably hardened.
Traps shall function in horizontal as well as in vertical installation.
Traps shall have integral strainers.
All traps shall be hydrostatically tested to twice the design pressure
4.12 Hoses
Manufacturer shall guarantee suitability of hoses for the service and working conditions
specified in the requisition, if the material is not specified in the Material Requisition for
any particular service.
All hoses shall be marked with service and working pressure at minimum two ends
clearly.
Hoses shall be resistant to ageing, abrasion and suitable for outdoor installations.
Complete Hose assembly shall be tested at two times the design pressure.
Flexible hose of hydrogen reformer should be of SS316 or equivalent to resist chloride
corrosion.
Steam hoses shall be subject to steam resistant test.
4.13 Expansion Joints
The applicable codes are ASME B 31.3 and EJMA (Expansion Joint Manufacturer’s
Association).
Bellows shall be formed from solution annealed sheet conforming to the latest ASTM
Spec. Any longitudinal weld shall be 100 % radiographed. The finished longitudinal
weld must be of the same thickness and same surface finish as the parent material.
Circumferential welds are not permitted. Bellows are to be hydraulically or expansion
(punched) formed. Rolled formed bellows are not acceptable. Noticeable punch or die
marks resulting from expansion operation are not acceptable.
No repairs of any kind are allowed on the bellows after forming. Deep scratches and
dents are not acceptable.
The out of roundness shall be limited to ± 3mm. This is the max. Deviation between the
max. & min. diameter.
The actual circumference of the welding end shall be maintained to ± 3 mm of the
theoretical circumference.
Apart from the usual requirements, the vendor shall also furnish:
Design calculations to justify stiffness and fatigue life.
Axial, lateral stiffness, angular stiffness, effective pressure thrust area.
Installation maintenance manual
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Bellows should be designed for 10,000 cycles (ANSI B31.3) minimum
4.14 Supporting & Spring Assemblies
The material Design, Manufacture and Fabrication shall be generally as per MSS-SP-
58/MSS-SP-89 and/or BS 3974.
Testing of springs shall be as per BS1726
4.15 Gaskets
Filler for spiral wound gasket shall not have any color or dye.
Full-face gaskets shall have boltholes punched out.
Non-metallic ring gaskets as per ASME/ ANSI B 16.21 shall match flanges to ASME/
ANSI B16.5 up to 24" and ASME/ANSI B16.47 OR AWWA for sizes > 24" unless
otherwise specified.
Spiral wound gaskets as per ASME B16.20 shall match flanges to ASME/ANSI B16.5
up to 24" and ASME B16.47 series B’ for sizes > 24", unless otherwise specified.
Inner and outer rings shall be considered for spiral wound gaskets based on under
mention philosophy.
CAF Gaskets shall not be used.
4.16 Outer Ring
C.S. outer ring irrespective of temperature-spiral strip material (except subzero
temperatures).
4.17 Inner Ring:
Material of inner ring to be C.S. for C.S. classes & same as that of spiral strip material
for other than C.S. classes.
As per code ANSI B 16.20
26" & above for all classes.
All sizes for vacuum classes, Cryo services and Hydrogen services.
2" & above for Hydrogen classes
All sizes in ‘H’ grades of S.S. SS347, SS321 classes.
For all sizes for classes with temperature beyond 427 ° C.
For piping class 900# and above
4.18 SPECIAL SERVICE REQUIREMENTS
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Requirements given below shall be supplemented with detailed requirements included
in the PIPING MATERIAL SPECIFICATION.
4.18.1 IBR
IBR stands for Indian Boiler Regulation. For steam services, it is statutory obligation to
meet IBR requirements.
For items under IBR, composition restrictions, test reports, painting, etc. shall be as per
IBR’s stipulations.
4.18.2 NACE & Sour Service
For items under this category, NACE MR01-75 shall be followed. Hardness shall be
below BH No.200 for CS material. Carbon equivalent (CE) shall be limited to 0.43.
4.18.3 Impact tests
Welded pipes and fittings used below ASME temp. – 29°C shall be impact tested as
per requirement of ASME B31.3. Impact test shall also be carried out as per process
Licensor’s requirement in addition to ASME B31.3
4.19.0 SPECIAL REQUIREMENTS FOR HYDROGEN SERVICE
4.19.1 GENERAL
Vendor quality plan shall include the special quality checks and inspection
requirements for these services.
For operating temperatures below 230°C, materials shall be of carbon steel to the
appropriate specifications
For operating temperatures of 230°C and above, materials shall be selected on the
basis of Nelson Curves of API Publication No. 941 (Steels for hydrogen service at
elevated temperatures and pressures in petroleum refineries and petrochemical
plants).
Impact test &normalizing of CS/AS materials shall be as mentioned in the code.
4.19.2 PIPE, FLANGES AND FITTINGS
4.19.2.1 Method of manufacture
All CS pipes, fittings and flanges having wall thickness 9.53mm and above, shall be
normalized. Cold drawn pipes and fittings shall be normalized after the final cold draw
pass for all thickness. In addition, fittings made from forgings shall have Carbon –
0.35% max. And Silicon - 0.35% max. The normalizing heat treatment shall be a
separate heating operation and not a part of hot forming operation.
All Alloy Steel (Cr.-Mo) pipes, forgings and fittings shall be normalized and tempered.
The normalizing and tempering shall be a separate heating operation and not a part of
hot forming operation. The maximum room temperature tensile strength shall be
100,000 psi.
In addition, details given by process licensor’s requirements shall be met.
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4.19.2.2 Post Weld Heat Treatment
All carbon steel pipes and fittings having wall thickness 19 mm and above shall be post
weld heat-treated.
All alloy steel (cr-mo) pipes and fittings shall be post weld heat treated irrespective of
type or thickness of weld.
All austenitic stainless steel grades shall be solution annealed after welding.
4.19.2.3 Ferrite No. Test
For all austenitic stainless steel, the weld deposit shall be checked for ferrite content. A
ferrite No. (FN) not less than 3% and not more than 10% is required to avoid sigma
phase embrittlement during heat treatment. FN shall be determined by Ferrite scope
prior to post-to-post weld heat treatment.
4.19.2.4 Impact Test
For all carbon steel and alloy steel pipes, flanges and fittings with the wall thickness
over 19 mm, Carpy-V Notch impact testing shall be carried out in accordance with
paragraph UG-84 of ASME Section VIII, Div-1 for weld metal and base metal from the
thickest item per heat of material and per heat treating batch. Impact test specimen
shall be in complete heat-treated condition and in accordance with ASTM A370.impact
energies at 0°c shall be average greater than 27 J (20 ft-lb) per set of 3 specimens,
with a minimum of 19J (15 ft-lb).
If welding is used in manufacture, impact test of Heat Affected Zone (HAZ) and welds
metal shall also be carried out.
In addition top the details given process licensor’s shall be met.
4.19.2.5 Hardness
For carbon steel pipes and fittings, hardness of weld and HAZ shall be limited to
200BHN(Max)
For alloy pipes and fittings, hardness of weld and HAZ shall be limited to 225BHN(Max)
4.19.2.6 Radiography
All girth welded joints (longitudinal and circumferential) shall be 100% radiographed in
accordance with UW-51 of ASME section VIII Div-1 and ASME Section V
4.19.2.7 Valves
All valves castings shall be radiographic quality.
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All cast valves flanges & bodies with flange rating of class 900 pr greater shall be
examined in accordance with paragraphs 7.2 through 7.5of Appnedix-7 of ASME SEC-
VIII DIV-1, regardless of casting quality factor.
4.20 INSPECTION & TESTING
All items and their parts shall be subjected to all mandatory as well as supplementary
(wherever specified) tests and checks called for in the respective codes/standards/data
sheets).
All critical service valves shall be hydro tested at site for leak test before installation. All
facility for testing shall be arranged by contractor.
The examining personnel shall have the requisite qualification and experience.
Client and its authorized representative reserve the right to vet and suggest changes in
vendor’s procedures.
Vendor’s works and facilities shall be accessible to the Client/Representative at all
reasonable times.
Test reports for all mandatory as well as supplementary tests wherever specified shall
be furnished.
All items of low alloy and exotic material shall be subjected to positive material
identification test before dispatch as well as at site before fabrication/ erection.
Inspection and Testing shall be as per approved QAP.
4.20 MARKING
All items shall be marked (stamped/etched) in accordance with the applicable
code/standard/specification. In addition, the item code, if available, shall also be
marked.
For ease of identification, the color of painted strip (wherever required) shall be as per
the applicable standard.
Paint or ink for marking shall not contain any harmful metal or metal salts, which can
cause corrosive, attack either ordinarily or in service.
Special items/ smaller items shall have attached corrosion resistant tag providing
salient features.
For Color coding for all materials refer separate standard specification on color-coding.
All materials including alloy steel pipes, fittings, flanges, Valves, Bolts and Nuts etc,
shall maintain 100 % fool proof PMI with punch marked and proper color coding.
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4.21 DISPATCH
All items shall be dry, clean and free from moisture, dirt and loose foreign materials of
all kinds.
All items shall be protected from rust, corrosion, and mechanical damage during
transportation, shipment and storage.
Rust preventive on machined surfaces to be welded shall not be harmful to welding and
shall be easily removable with a petroleum solvent.
Ends shall be suitably protected, and the protectors shall be securely and tightly
attached.
Each variety and size of item shall be supplied in separate packaging marked with the
purchase order no. item code (if available), and the salient specifications.
Carbon steel, LTCS and low alloy steel valves shall be painted with one coat of
inorganic zinc silicate primer.
ANNEXURE F
GENERAL REQUIREMENTS
1.0 The entire threaded high pressure/high temperature instrument Tapping and critical service
tapping like hydrogen etc., should be seal welded.
2.0 Vessel such as knock out drum for instrument air with auto drain to be provided at all
battery limits.
3.0 Identification or color coding on pipes, fittings, valves, fasteners, etc shall be as per IS: 5
(latest) for easy and clear identification of materials at site
4.0 All the Austenitic stainless steel equipment/ piping passivation scheme/ facility shall be
provided as per Process Licensor's specifications.
5.0 All steam trap outlet inside process plant shall be connected to be connected to a common
header with funnels and drained to suitable location to the same
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ANNEXURE G
STANDARD DRAWINGS (For Reference only)
STD. DRGS. NO. DESCRIPTION
44LK-5100/L.02/0001 GENERAL PIPING ABBREVATION 44LK-5100/L.02/0002 REPRESENTATION OF PIPING ON GENERAL ARRANGEMENT DRAWINGS 44LK-5100/L.02/0003 PIPING SYMBOLS FOR GENERAL ARRANGEMENT DRAWINGS 44LK-5100/L.02/0004 REPRESENTATION OF PIPING ON GENERAL ARRANGEMENT DRAWINGS 44LK-5100/L.02/0005 VALVE SYMBOLS FOR PIPING G.A.'S 44LK-5100/L.02/0006 REPRESENTATION OF PIPING ON GENERAL ARRANGEMENT DRAWINGS 44LK-5100/L.02/0007 STANDARD SYMBOLS FOR ISOMETRIC PIPING DRAWINGS 44LK-5100/L.02/0008 INSTRUMENT SYMBOLS FOR PIPING G.A.'S 44LK-5100/L.02/0009 PIPING ORIENTATIONS DATA REQUIRED ON G.A.'S.
44LK-5100/L.02/0010 MINIMUM PIPE SPACING BETWEEN BARE PIPE AND PIPE WITH FLANGES (STAGGERED)
44LK-5100/L.02/0011 MINIMUM PIPE SPACING BETWEEN BARE PIPE AND BARE PIPE (WITHOUT FLANGES)
44LK-5100/L.02/0012 METHOD OF CALCULATING PIPE SPACING WHEN SHEET 1 OR 2 CANNOT BE USED.
44LK-5100/L.02/0013 PIPE SPACING TABLE FOR 300#, 600#, 900# & 1500# FLANGE RATINGS. 44LK-5100/L.02/0014 PIPE SPACING TABLE FOR 300#, 600#, 900# & 1500# FLANGE RATINGS. 44LK-5100/L.02/0015 PIPE SPACING TABLE FOR 300#, 600#, 900# & 1500# FLANGE RATINGS. 44LK-5100/L.02/0033 DIMENSION FOR SLIP-ON FLANGES ON WELD ELBOWS 44LK-5100/L.02/0045 PIPING DIMENSIONS VALVES-S.W./SCR'D/FLG'D,1.1/2" & BELOW 44LK-5100/L.02/0046 PIPING DIMENSIONS VALVES 2" NB AND ABOVE 44LK-5100/L.02/0047 PIPING DIMENSIONS VALVES 2" NB AND ABOVE 44LK-5100/L.02/0048 DIMENSIONS OF BALL VALVES 1/4" TO 10" NB 44LK-5100/L.02/0049 CONTROL VALVES CLEARANCE REQUIREMENTS 44LK-5100/L.02/0050 CONTROL VALVE STATIONS MANIFOLD AND PIPING ARRANGEMENTS
44LK-5100/L.02/0059 CARBON & STAINLESS STEEL 150# LARGE TONGUE MALE SPEC.BLIND, SPACER & SPADE FOR FEMALE ANSI B16.5 FLGS
44LK-5100/L.02/0061 CARBON & STAINLESS STEEL 300# LARGE TONGUE SPEC. BLIND,SPACER & SPADE FOR LARGE GROOVE ANSI B16.5 FLGS
44LK-5100/L.02/0062 CARBON, ALLOY & ST.STEEL:-300# R.T.J. FEMALE SPEC. BLIND, SPACER & SPADE FOR ANSI B16.5 FLANGES.
44LK-5100/L.02/0064 CARBON & S.STEEL 600# LARGE TONGE SPEC.BLIND, SPACER & SPADE FOR LARGE GROOVE ANSI B 16.5 FLANGES.
44LK-5100/L.02/0066 CARBON, ALLOY & ST.STEEL:-600# R.T.J. FEMALE SPEC. BLIND, SPACER & SPADE FOR ANSI B16.5 FLANGES.
44LK-5100/L.02/0068 CARBON, ALLOY & ST.STEEL:-900# R.T.J. FEMALE SPEC. BLIND, SPACER & SPADE FOR ANSI B16.5 FLANGES.
44LK-5100/L.02/0069 CARBON, ALLOY & ST.STEEL:-1500# R.T.J. FEMALE SPEC. BLIND, SPACER & SPADE FOR ANSI B16.5 FLANGES.
44LK-5100/L.02/0070 TEMPORARY STRAINERS FOR RAISED FACE AND FULL FACE ANSI FLANGES
44LK-5100/L.02/0071 TEMPORARY STRAINERS AND REPLACEMENT RINGS FOR ANSI FLANGES WITH RING TYPE FACE
44LK-5100/L.02/0072 PIPE SLEEVE DETAILS FOR INSULATED LINES UNDER ROADS & DYKE WALLS 44LK-5100/L.02/0073 PIPE SLEEVE DETAILS FOR INSULATED LINES UNDER ROADS & DYKE WALLS 44LK-5100/L.02/0076 STANDARD DETAILS FOR SAMPLE POINTS. (S.P.) 44LK-5100/L.02/0077 STANDARD SAMPLE COOLER 44LK-5100/L.02/0091 FLANGED BRANCH CONNECTION DETAIL FOR C.S.MORTAR LINED PIPES 44LK-5100/L.02/0092 BRANCH CONNECTION DETAIL FOR C.S.MORTAR LINED PIPES. 44LK-5100/L.02/0093 DETAILS OF COLLAR FOR CEMENT MORTAR LINED PIPING 44LK-5100/L.02/0100 STANDARD FOR STEAM TRAP ASSEMBLY 44LK-5100/L.02/0101 STANDARD FOR STEAM TRAP ASSEMBLY
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44LK-5100/L.02/0102 STANDARD FOR STEAM TRAP ASSEMBLY 44LK-5100/L.02/0103 STANDARD FOR STEAM TRAP ASSEMBLY 44LK-5100/L.02/0106 JACK SCREWS FOR SPECTACLE BLINDS SPADES & SPACERS TO ANSI B165 44LK-5100/L.02/0109 TUNDISH FOR 1/2" - 8" NB PIPE 44LK-5100/L.02/0111 DETAILS OF SINGLE HYDRANT 44LK-5100/L.02/0112 DETAILS OF DOUBLE HYDRANT 44LK-5100/L.02/0113 DETAILS OF WATER MONITOR 44LK-5100/L.02/0114 DETAILS OF HOSE BOX 44LK-5100/L.02/0115 VALVE CHAMBER 44LK-5100/L.02/0116 MAXIMUM ALLOWABLE PIPE SPANS AND UNIT WEIGHTS 44LK-5100/L.02/0117 MAXIMUM ALLOWABLE PIPE SPANS AND UNIT WEIGHTS 44LK-5100/L.02/0118 MAXIMUM ALLOWABLE PIPE SPANS AND UNIT WEIGHTS 44LK-5100/L.02/0119 MAXIMUM ALLOWABLE PIPE SPANS AND UNIT WEIGHTS
44LK-5100/L.02/0122 STANDARD SPACING FOR PIPE RUNS NEAR COLUMNS, BELOW BEAMS AND SIZE OF FLOOR CUT-OUTS.
44LK-5100/L.02/0123 STANDARD ARRANGEMENT OF SLEEPERS 44LK-5100/L.02/0124 TYPICAL DETAILS OF UTILITY STATION 44LK-5100/L.02/0131 UNDER GROUND PIPING SYSTEM TYPICAL SCHEME 44LK-5100/L.02/0132 OWS SYSTEM ARRANGEMENT OF MANHOLES WITH GAS SEAL & FLAME TRAP 44LK-5100/L.02/0134 UNDER GROUND PIPING SYSTEM DRAIN FUNNEL DETAILS 44LK-5100/L.02/0135 UNDER GROUND PIPING SYSTEM CATCH BASIN DETAILS
Note -These standard drawings are included as the part of feed under index “Standard Drawings”
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