32-SAMSS-020

Previous Issue: 9 August 2009 Next Planned Update: 14 November 2014 of 18 Primary contact: Al-Dabass Abdulkarim Abdulaziz on 966-3-8735985

Copyright©Saudi Aramco 2009. All rights reserved.

Materials System Specification

32-SAMSS-020 14 November 2009 Manufacture of Trays and Packing

Trays and Packing Process Design Standards Committee Members Bu Naiyan, Ahmad Saleh, Chairman Dabass, Abdulkarim Abdulaziz, Vice Chairman Ghamdi, Khalid Hamid Ibrahim, Mohammed Abdulrahman Mugim, Salah Mohammed Mutawa, Husain Matouq Naffaa, Mahmoud Youniss Ofi, Saleh Hodaiban Qahtani, Abdullah Melfi Qahtani, Salem Mohummed Roy, Samit Utaibi, Khalid Saiyaf

Saudi Aramco DeskTop Standards Table of Contents 1 Scope............................................................. 2 2 Conflicts and Deviations................................. 2 3 References..................................................... 2 4 Definitions....................................................... 5 5 Responsibilities.............................................. 5 6 Proposals....................................................... 6 7 Tray Design.................................................... 6 8 Packing Design.............................................. 9 9 Mechanical Design......................................... 9 10 Materials....................................................... 12 11 Tray Fabrication........................................... 14 12 Tray Installation............................................ 14 13 Inspection and Testing................................. 16 14 Marking and Shipping.................................. 17 15 Drawings, Calculations and Data................. 18

Document Responsibility: Trays and Packing Process Design 32-SAMSS-020

Issue Date: 14 November 2009

Next Planned Update: 14 November 2014 Manufacture of Trays and Packing

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1 Scope

This specification covers the minimum mandatory requirements for the manufacture

and installation of new tray systems and inert packing.

2 Conflicts and Deviations

2.1 Any conflicts between this Specification and other applicable Saudi Aramco

Materials System Specifications (SAMSSs), Engineering Standards (SAESs)

Standard Drawings (SASDs), or industry standards, codes, and forms shall be in

writing by the Company or Buyer Representative through the Manager, Process

and Control Systems Department of Saudi Aramco, Dhahran.

2.2 Direct all requests to deviate from this specification in writing to the Company

or Buyer Representative, who shall follow internal company procedure

SAEP-302 and forward such requests to the Manager, Process and Control

Systems Department of Saudi Aramco, Dhahran.

3 References

Materials or equipment supplied to this specification shall comply with the latest edition

of the references listed below, unless otherwise noted.

3.1 Saudi Aramco References

Saudi Aramco Engineering Procedure

SAEP-302 Instructions for Obtaining a Waiver of a Mandatory

Saudi Aramco Engineering Requirement

Saudi Aramco Materials System Specification

32-SAMSS-004 Manufacture of Pressure Vessels

Saudi Aramco Engineering Standards

SAES-A-007 Hydrotesting Fluids and Lay-up Procedures

SAES-A-206 Positive Material Identification

SAES-L-133 Corrosion Protection Requirements for Pipelines,

Piping and Process Equipment

SAES-W-010 Welding Requirements for Pressure Vessels

Saudi Aramco Standard Drawing

AD-036981 Tolerances for Pressure Vessels

http://standards/docs/SAEP/PDF/SAEP-302.pdf

http://standards/docs/SAEP/PDF/SAEP-302.pdf

http://standards/docs/SAMSS/PDF/32-SAMSS-004.pdf

http://standards/docs/SAES/PDF/SAES-A-007.pdf


http://standards/docs/SAES/PDF/SAES-L-133.pdf

http://standards/docs/SAES/PDF/SAES-W-010.pdf

http://standards/docs/Standard_Drawings/PDF/AD-036981-001.pdf




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Saudi Aramco Inspection Requirements

Form 175-325000 Manufacture of Trays and Packing

Saudi Aramco Forms and Data Sheets

NMR-7919-2 Non-material Requirements for Column Trays

9524-ENG Process Design Data Sheet-Packing

9524-1-ENG Process Design Data Sheet-Stream Composition

9524-2-ENG Process Design Data Sheet-Trays

9527-ENG Pressure Vessel Data Sheet

3.2 Industry Codes and Standards

American Iron and Steel Institute

AISI SG-673 Specification for the Design of Cold Formed Steel

Structural Members

American Society of Mechanical Engineers

ASME SEC VIII D1 Boiler and Pressure Vessel Codes

ASME SEC VIII D2 Pressure Vessels, Alternative Rules

ASME SEC IX Qualification Standard for Welding and Brazing

Procedures, Welders, Brazers, and Welding and

Brazing Operators

International Organizational for Standardization

NACE MR0175/ Petroleum and Natural Gas Industries Materials

ISO 15156 for use in H2S-Containing Environments in Oil

and Gas Production

American Society for Testing and Materials

ASTM A36 Standard Specification for Carbon Structural Steel

ASTM A167 Standard Specification for Stainless and Heat-

Resisting Chromium-Nickel Steel Plate, Sheet,

and Strip


Resisting Chromium Steel Plate, Sheet, and Strip

ASTM A193 Standard Specification for Alloy-Steel and Stainless

Steel Bolting Materials for High-Temperature

Service

http://standards/docs/Inspection_Requirements/PDF/175-325000.pdf

http://standards/docs/Nonmaterial_Requirements/PDF/SA-7919-2.PDF

http://standards/docs/Forms_Data_Sheets/XLS/SA-9524.XLS

http://standards/docs/Forms_Data_Sheets/XLS/SA-9524-1.XLS

http://standards/docs/Forms_Data_Sheets/XLS/SA-9524-2.XLS

http://standards/docs/Forms_Data_Sheets/PDF/SA-9527.pdf




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ASTM A194 Standard Specification for Carbon and Alloy Steel

Nuts for Bolts for High-Pressure and High-

Temperature Service


Resisting Chromium and Chromium-Nickel Steel

Plate, Sheet, and Strip for Fusion-Welded

Unfired Pressure Vessel


Resisting Steel Bars and Shapes

ASTM A283 Standard Specification for Low and Intermediate

Strength Carbon Steel Plates

ASTM A285 Standard Specification for Pressure Vessel Plates,

Carbon Steel, Low-and Intermediate-Tensile

Strength

ASTM A307 Standard Specification for Carbon Steel Bolts and

Studs, 60,000 psi Tensile

ASTM A322 Standard Specification for Steel Bars, Alloy,

Standard Grades

ASTM A479 Stainless Steel Bars and Shapes for Use in Boilers

and Other Pressure Vessels


Carbon Steel for Intermediate and High

Temperature Services


Carbon Steel for Moderate and Lower

Temperature Services

ASTM A563 Standard Specification for Carbon and Alloy Steel

Nuts

ASTM A675 Standard Specification for Steel Bars, Carbon,

Hot-Wrought Special Quality, Mechanical

Properties

ASTM B127 Standard Specification for Nickel-Copper Alloy

Plate, Sheet and Strip

ASTM B164 Standard Specification for Nickel-Copper Alloy

Rod, Bar, and Wire




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4 Definitions

Major Beam: Beams that extend from wall to wall across the vessel without

interruptions. All other beams should be considered minor beams.

Tray Assemblies and Systems: Components required for the complete tray

installation, including tray decks, downcomers, feed distributors, and tray hardware.

Tray Hardware: Components required for assembling tray sections and attaching tray

assemblies to a vessel, including clamps, nuts, bolts, washers, and gaskets.

Design Engineer: The Engineering Company responsible for specifying on the data

sheets the process and mechanical requirements for trays and packing.

Packing Manufacturer: The company responsible for the process design and

manufacture of inert packing in accordance with this specification.

Tray Manufacturer: The company responsible for the process design and

manufacture of trays in accordance with this specification.

Saudi Aramco Engineer: The General Supervisor of the Downstream Process

Engineering Division, Dhahran.

Saudi Aramco Inspector: The person or company authorized by the Saudi Aramco

Inspection Department to inspect trays and packing to the requirements of this

specification.

5 Responsibilities

5.1 The Design Engineer is responsible for specifying all process design data

required for the design of trays and packing, verifying the validity, consistency

and completeness of data on the design data sheets, and verifying the process

designs of the Tray and Packing Manufacturers.

5.2 The Tray Manufacturer is responsible for the hydraulic and mechanical design

of tray systems, based on the process and mechanical design conditions

specified on the data sheets and the requirements of this specification.

5.3 The tray diameter(s), number of passes, and spacing as specified on the data

sheets are preliminary and are to be verified by the Tray Manufacturer with

proposal.

5.4 The Tray Manufacturer shall furnish all tray assemblies, including all

component parts such as, but not limited to tray decks, weirs, downcomers,

baffles, drawoffs, troughs, seal pans, valves, risers, bubble caps, support beams,

and tray hardware.




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5.5 The Tray Manufacturer is responsible for the mechanical design of all tray

supports that are to be welded to the vessel, including but not limited to tray

support rings, downcomer support bars, and chairs for support beams.

5.6 The Vessel Manufacturer is responsible for the supply and installation of all

supports that are welded to the vessel, in accordance with the Tray and Packing

Manufacturers' drawing.

5.7 Unless otherwise specified on the purchase order, the Vessel Manufacturer is

responsible for the installation of tray assemblies.

5.8 The Packing Manufacturer is responsible for the hydraulic and mechanical

design of packing, based on the process design conditions specified on the data

sheets and the requirements of this specification.

6 Proposals

6.1 The Tray and Packing Manufacturers' proposals shall be based on details for

individual vessels and the requirements of this specification.

6.2 The Tray or Packing Manufacturer may offer alternative designs, but must quote

on the base inquiry documents.

6.3 Proposals shall include a detailed description of any exception to the

requirements of this specification.

6.4 The Tray or Packing Manufacturer shall provide a written guarantee for the

length of the warranty period specified in the purchase order or contract

documents that the trays or packing shall perform under continuous operation at

design conditions specified on the data sheets.

7 Tray Design

7.1 General

7.1.1 The Tray Manufacturer shall determine the number of caps or valves

required and shall provide the final layout drawings for review and

approval by the Design Engineer.

7.1.2 Trays are to be designed using bolted sectional construction with

sections removable through vessel manways if specifically requested.

quick fastening method like lip type connection is acceptable. Bolting

connections shall be use to attach downcomer plates and for heavy liquid

load trays (e.g., vacuum stripping sections and amine regenerator).




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7.1.3 Draining shall be provided on trays when specified on the data sheets

(except blind trays).

7.1.4 Draining shall be accomplished by means of opening at the base of outlet

weir / inlet weir.. Draining from a blind tray shall be accomplished

through a draw-off nozzle and not through weep holes.

7.1.5 All draw-off trays shall be designed to establish a seal on the trays at

start-up, and hold a seal on the trays to facilitate cooling down of a

vessel at shutdown.

7.1.6 Draw-off shall be from the inlet of a fractionating tray, or from a blank

tray, or from a pan extending across the vessel.

7.1.7 All like parts of tray assemblies shall be made interchangeable.

Symmetrical tray layouts shall be used wherever possible.

7.1.8 Wedge-type trays and cap-type hold-down devices are prohibited.

7.1.9 Bubble cap and chimney trays that are used as draw-off trays (partial or

total draw-off) shall be seal welded unless accessibility/installation

requirements are prevailing. Seal welding is required at all panel to

panel, panel to supporting ring, panel to beam and chimney (riser) to

panel connections, except at tray man-ways which shall be provided with

gaskets. Gasket Material to be specified by the Design Engineer.

Commentary Note:

In case seal welding is not possible, special attention shall be given to chimney tray design (e.g,. minimum thickness, gaskets sizing) and special care has to be paid during installation and thermal expansion during operation.

7.2 Bubble Cap Trays

7.2.1 Caps shall be arranged in an equilateral triangular pitch with rows

normal to the liquid flow.

7.2.2 The distance between the centerline of the outer rows of caps and

downcomer inlets or overflow weirs shall be equal to at least the cap

diameter plus 25 mm.

7.2.3 The minimum distance between the centers of two adjacent caps shall be

equal to 1.25 times the cap diameter.

7.2.4 The end caps in each row shall lie in a circle with a radius of one cap

diameter less than the vessel radius.




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7.2.5 The type of cap shall be selected to permit a total superficial slot velocity

which lies between the following requirements:

½(V) X rho

14.8

> V (s) >

½(V) X rho

4.2

(1)

Where: V (s) = Total superficial slot velocity, m/s

rho (V) = Vapor density, Kgs/m³

7.2.6 Caps shall be selected so that net riser area, net reversal area, and net

annular area are approximately equal. Depending on the vapor load, the

slot area of the caps shall be between 1 and 2 times the cap riser area.

7.3 Sieve Trays

7.3.1 Holes shall have a uniform pitch on triangular spacing.

7.3.2 Holes covered by support beams, tray rings, or other internals shall not

be included in determining the available hole area. The space taken up

by obstructions in the perforated area shall not exceed 10% of the area of

the perforated tray sections.

7.3.3 Punched trays shall not be thicker than hole diameters. Punched trays

shall be installed with the punched side on the underside.

7.3.4 Holes shall be at least 100 mm from inlet weirs, unless recessed inlet

weirs are used with tops flush with the tray deck. In such cases, holes

are permitted within 50 mm of the inlet weir. The last row of holes shall

be located at least 100 mm from the outlet weir.

7.3.5 No holes shall be located closer than 75 mm from the shell of the vessel.

7.4 Valve Trays

7.4.1 Movable valves shall be supplied with guides and stops, wherein the

valve guides and stops are integral with the valve body.

Commentary Note:

Rectangular valves are preferred (optional). Rectangular valves shall have strips to prevent valve slipout.

7.4.2 Movable valves shall be supplied with tabs or other projections to

provide a clearance of 1.5 mm to 3 mm between the valve and the tray

when the valve is in the closed position.




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7.4.3 Valve legs and vertical travel stops shall be arranged so that valves

cannot work through the tray holes during normal operation.

7.4.5 Anti-rotation devices shall be provided to prevent valve spinning, except

caged type, axi-symmetrical valve designs.

8 Packing Design

8.1 The Design Engineer shall provide the following data to Packing Manufacture:

1. Bed length(s) and corresponding diameter

2. Equivalent number of theoretical stages

8.2 The Packing Manufacturer shall verify the following data based on the

information specified on the data sheets and any proprietary data on the packing

material:

1. Bed weights

2. Pressure drop across the bed

3. Allowable turndown ratio

8.3 The maximum height of a packed section shall be commensurate with the crush

strength of the packing material selected.

8.4 The Packing Manufacturer shall supply supporting data of crush strength to the

Design Engineer.

8.5 The design of packed section shall be such that the packing materials are

securely constrained and prevented from migrating in the vessel or into the

connecting piping.

8.6 For random packing materials (raschig rings, berl saddles, etc.), the ratio of the

vessel diameter to the diameter of the packing unit shall never be less than 8 to 1

in order to minimize channeling along the walls of a vessel.

9 Mechanical Design

9.1 General

9.1.1 Trays shall be mechanically designed to allow for manufacturing

tolerances on both the vessel and trays. Allowances shall be made for

the vessel shell being out of round as limited by ASME SEC VIII D1 or

ASME SEC VIII D2, as applicable.




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9.1.2 Allowances shall be made for differential thermal expansions between

the vessel and trays at the design temperature.

9.1.3 Provisions shall be made to transfer shear loads, resulting from upset

conditions whenever specified in process / mechanical data sheets for

the Column in webs at ends of trusses, using clips attached to the vessel

shell.

9.1.4 All tray parts (except parts welded to the vessel) affected by the

dimensions tolerances specified on SASD AD-036981 shall be made

adjustable so that when installed, tray assemblies will be within the

specified tolerances.

9.1.5 The weight of any single section of removable tray assembly except

downcomer trusses and inlet panel shall not exceed:

1. 35 Kgs (75 lbs.) for vessels up to and including 1.2 m diameter,

and

2. 70 Kgs (150 lbs.) for vessels above 1.2 m diameter.

9.1.6 Each tray shall be provided with one or more manways designed for

removal from above and below the tray deck. Whenever possible, the

minimum clear opening dimension shall be 380 mm x 460 mm.

9.1.7 Tray manways shall be aligned vertically and shall be located to provide

access to all sections of the vessel.

9.1.8 Unless otherwise specified on the data sheets, the clearance under tray

support beams shall be a minimum of 450 mm. If this is not achievable,

manways shall be provided on both sides of beams for both tray above

and below.

9.1.9 It is the responsibility of the Tray Manufacturer to determine the

required dimension of tray support rings in accordance with the

requirements of paragraph 9.2 and 9.3 of this specification.

9.1.10 All internal piping systems, such as feed and reflux distributors, shall be

supported from the vessel shell or head, and not from trays.

9.1.11 Bolts diameter smaller than 10 mm shall not be used. The lengths of

miscellaneous assembly bolts shall be grouped by 10-mm increments.

The minimum length for bolts is 25 mm for tray panels

9.1.12 Caps shall be designed so that they are removable from above the tray.





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9.1.13 Blind trays shall be seal welded after installation.

9.1.14 Liquid trough gravity distributors shall be self supported by independent

beams.

9.2 Loads, Deflections and Allowable Stresses

9.2.1 Maximum allowable stress of ⅓ of the ultimate tensile strength of the

material at the vessel design temperature shall be used to mechanically

design Tray assemblies and supports. Corrosion allowance shall not be

used for strength purpose.

9.2.2 Tray assemblies shall be mechanically designed for a uniform live load

using the greater of 0.01 Kgs/cm² (20 lbs./ft²) or the weight of the tray

assembly plus the maximum operating weight of liquid on the tray at

the design temperature of the vessel.

9.2.3 Tray assemblies shall also be designed for a concentrated load of

114 Kgs (250 lbs.) located at any location on the tray at an ambient

temperature of 38°C. The maximum allowable stresses for loads at

ambient temperatures shall be in accordance with AISI SG-673.

9.2.4 For vessels up to 3 m in diameter, the maximum deflection of carbon

and alloy steel assembled trays shall not exceed 3 mm. For vessels

greater than 3 m in diameter, the maximum deflection of carbon and

alloy steel assembled trays shall not exceed 0.1% of the vessel diameter.

9.2.5 Support beams and trusses shall not restrict the flow of vapor between

tray passes, flow of liquid into downcomers, or personnel accessibility.

Elements depth transversal to liquid flow shall be limited to maximum

of 20 % tray spacing.

9.3 Minimum Thickness and Corrosion Allowances

9.3.1 The minimum thickness of tray parts, in USS gage, including corrosion

allowance shall be in accordance with Table 2, Minimum Thickness of

Tray Components.




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Table 2 – Minimum Thickness of Tray Components

Tray Basic Material

Tray Component (Carbon Steel) (410, 410S, 304, 304S, 316, 316S and Monel)

Valves - 16 Ga or 1.5 mm

Bubble Caps, and Risers 10 Ga or 3.5 mm 16 Ga or 1.5 mm

Tray Decks, Downcomers Sheets, Weirs and Integral Beams/Trusses.

10 Ga or 3.5 mm 14 Ga or 2.0 mm

Packing tower material 10 Ga or 3.5 mm 14 Ga or 2.0 mm

Major Trusses and Beams 6.4 mm 10 Ga or 3.5 mm

9.3.2 The minimum design thickness for tray decks and downcomer sheets

shall be not less than 1.5 mm.

9.3.3 The minimum thickness of downcomer bars shall be 6.4 mm for carbon

steel and 5 mm for alloy steels.

9.3.4 Ring supports, downcomer bars, support beams and other tower

attachments which are not an integral part of the deck or downcomer

sections shall be designed with a minimum of 3 mm corrosion

allowance when made of carbon steel, or with a minimum of 1.5 mm

total allowance when made of alloy.

9.3.5 When a portion of a deck or downcomer including the downcomer

trusses is formed into a support member, the support member shall have

the same corrosion allowance that is provided for the deck.

10 Materials

10.1 All tray hardware shall be manufactured of the same basic material type as tray

deck plates, except for trays with carbon steel deck plates, which shall have 410

stainless steel hardware.

10.2 Tray parts shall conform to the ASTM material designations corresponding to

the basic material types as specified in Table 3, Acceptable Material

Specifications.




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Table 3 – Acceptable Material Specifications

Basic Material Type Plate, Sheet or Strip Bars and Shapes Nuts and Bolts

Carbon Steel A36, A283, A285, A515 or A516

A36, A322 or A675 (Excluding Grade 90)

A193 Grade B6 w/ A194 Grade 6 nuts

12% Chrome A176 or A240, Types 405 or 410S

A276 Type 410 A193 Grade B6 w/ A194 Grade 6 nuts

Type 304 Stainless Steel

A167 or A240, Types 304 or 304L

A276 Types 304 or 304L or A479 UNS S30400/S30403

A193 Grade B8 w/ A194 Grade 8 nuts

Type 316 Stainless Steel

A167 or A240, Types 316 or 316L

A276 Types 316 or 316L or A479 UNS S31600/S31603

A193 Grade B8M w/ A194 Grade 8M nuts

Monel B127 UNS N04400 B164 UNS N04400

B164 F468, UNS N04400, w/ F467 Grade N04400 nuts or F468 UNS N05500 w/ F467 Grade N05500 nuts

10.3 All materials for vessels in sour service shall conform to ISO 15156 and

SAES-L-133.

10.4 Materials for tray support rings shall be in accordance with 32-SAMSS-004.

10.5 The use of non-ASTM materials shall be approved by the Saudi Aramco

Engineer.

10.6 Gasket materials shall be asbestos-free and compatible with the service

conditions of the vessel.

10.7 Entire valve unit, i.e., valves, guides and stops, shall be a minimum of type 410

stainless steel for all new and revamped columns, unless a higher grade material

is specified in the data sheet.

10.8 The entire tray decks, i.e., active areas, blank areas, weirs and downcomers of

trays shall be a minimum of type 410 stainless steel for all new and revamped

columns, unless another grade material is specified in the data sheet. Carbon

steel is not allowed unless required for process reasons (e.g., HF Alkylation)

10.9 All support parts welded to the column shell, i.e., the tray support rings and the

downcomer support bars shall be the same basic material type as the inside wall

of the column, unless a higher grade material is specified in the data sheet.

10.10 Gravity liquid distributors shall be a minimum of type 410 stainless steel for all

new and revamped columns, unless a higher grade material is specified in the

data sheet. Gravity Liquid distributors shall be the same basic material type as

the packing bed located below.

http://standards/docs/SAES/PDF/SAES-L-133.pdf

http://standards/docs/SAMSS/PDF/32-SAMSS-004.pdf




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Commentary Note:

Internal feed pipe liquid distributors shall be made the same basic vessel material. For wet sour gas systems shall be minimum seamless or HIC resistant carbon steel unless a higher grade material is required and specified in the data sheet.

10.11 For existing columns, carbon steel valve units, tray decks, and/or liquid

distributors (such as detailed in clauses 10.7, 10.8 and 10.9 respectively) may be

replaced in kind, providing no corrosion reported by inspection, the service and

operating conditions remain unchanged, and the specifications remain as per the

original data sheet(s).

10.12 The material of packing (random, structured, or grids) shall be a minimum of

type 410 stainless steel for all new and revamped columns, unless a higher grade

material is specified by Design Engineer and approved by Saudi Aramco

Engineer.

10.13 Material identification of all non-carbon steel materials shall be in accordance

with SAES-A-206.

10.14 An isolation material (Gasket) between dissimilar materials is required to avoid

severe galvanic interaction ONLY in services where the bulk fluid is water

(e.g., Desalination & De-aerators columns).

11 Tray Fabrication

11.1 The surface of fabricated parts shall be free from scale, dents and defects.

11.2 Burrs shall be removed from all perforated areas and edges of tray sections.

Burrs on sheared edges are acceptable.

12 Tray Installation

12.1 General

12.1.1 All tray support rings and other attachments required for supporting

trays shall be welded to the vessel shell. The welding of tray sub-

assemblies and tray decks to tray supports is prohibited.

12.1.2 All segments of valve trays that contain valves shall be installed after

the vessel has been hydrotested, thoroughly dried, and cleaned.

12.1.3 Vessel circumferential seams shall not be covered by the tray or tray

support installations.





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12.1.4 Trays are to be installed in accordance with the acceptable tolerances as

per SASD AD-036981 and the Tray Manufacturer's Drawings.

12.1.5 All tray and distributor support clips shall be welded to the vessel prior

to any postweld heat treatment and prior to hydrostatic testing.

12.1.6 Tray bolts shall be tightened, using a calibrated torque wrench, to the

Tray Manufacturer's instructions and engaged to the full depth of the

nuts.

12.2 Welding

12.2.1 Welding of Shell Attachments

1. The welding of tray supports and all attachments to vessel shells is

the responsibility of the Vessel Manufacturer and shall conform to

SAES-W-010.

2. All attachments to vessel shells shall be fully welded on all sides.

Skip welding is not permitted.

3. All welding to vessel shells shall be completed prior to post weld

heat treatment and prior to the hydrostatic testing of a vessel.

12.2.2 Welding of Other Attachments

1. All welding procedures and welders shall be qualified in

accordance with ASME SEC IX.

2. Approved processes are SMAW and GTAW. Any other process

requires the approval of the Saudi Aramco Engineer.

3. The filler metal shall match the composition and mechanical

properties of the base metal. If two different base metals are to be

joined, the filler metal selection shall be approved by the Saudi

Aramco Engineer.

4. A weld map shall be prepared to indicate which welding

procedure will be used for each weld joint.

5. All WPSs, PQRs and Weld Maps shall be submitted for approval

to the Saudi Aramco Engineer prior to the start of the job. All

WPSs, PQRs and weld maps shall be available at the work site for

review at any time.

6. All full-penetration groove welds shall be welded from both sides.

Single-sided groove welds are not permitted unless approved by


http://standards/docs/SAES/PDF/SAES-W-010.pdf




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the Saudi Aramco Engineer. Double-sided welds shall be ground

or gouged to sound metal prior to welding the second side.

7. Thermally cut or gouged surfaces of all material shall be ground to

bright (un-oxidized) material prior to welding.

13 Inspection and Testing

13.1 Tray Manufacturers Shop

13.1.1 Tray materials and hardware are subject to shop inspection by the Saudi

Aramco Inspector, in accordance with Saudi Aramco Inspection

Requirements Form 175-325000.

13.1.2 One complete tray assembly of each type and size for each vessel being

manufactured shall be fully assembled and inspected at the Tray

Manufacturer shop for conformance to the requirements of this

specification. For symmetrical internal configuration (e.g., multipass

trays) only half tray can be assembled and inspected.

13.2 After Tray Installation

13.2.1 After installation, all trays shall be visually inspected for conformance

to the Tray Manufacturer's drawings and installation tolerances.

13.2.2 Bubble cap and valve trays are to be inspected by using a strong light.

Any open seams, holes or gaps, which exceed 6 mm, shall be closed by

non-asbestos gaskets and bolt tightening. Openings less than 6 mm

shall be repaired by bolt tightening or gaskets.

13.2.3 Water used for leakage testing shall not contain more than 50-PPM

chlorides in accordance with SAES-A-007.

13.2.4 The addition of gaskets and/or rope is to be regarded as the last course

of action to be taken to seal trays.

13.2.5 Materials for gaskets and rope must be compatible with the design

conditions of the vessel and chemically resistant to the service.

13.3 Leakage Test

13.3.1 Leakage test shall be performed, in the presence of the manufacturer, on

trays after installation in the erected vessel as follows:

Blind and draw-off Trays (including those as described by paragraph

7.1.9 of this specification).

http://standards/docs/Inspection_Requirements/PDF/175-325000.pdf





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a) All tray assemblies shall be thoroughly cleaned.

b) Trays provided with man-ways shall be filled with water to the

overflow weir or chimney height, as applicable. The level shall

not drop by more than 25 mm after 1 hour and 15 minutes. If the

actual leakage rate exceeds this, gaskets shall be added or the tray

replaced and re-tested. All tray assemblies with no man-ways

shall have no leakage.

d) After testing, the tray assembly shall be thoroughly dried.

13.3.2 If the actual leakage rate exceeds this, gaskets shall be added or the tray

replaced and re-tested.

13.3.3 After testing, all plugs are to be removed and the tray assembly

thoroughly dried.

13.3.4 No leakage test is required for sieve, valves and cartridge trays.

14 Marking and Shipping

14.1 Marking

14.1.1 Each tray or packing material part segment shall be piece marked with

part number in the part-list as shown on the Tray/Packing

Manufacturer's drawings.

14.1.2 The marking shall be done with water-insoluble material that contains

no harmful substances that would attack or harmfully affect the material

at ambient or elevated temperatures. The marking material shall be free

of lead, sulfur, zinc, cadmium, mercury, chlorine, or other halogens.

14.1.3 Tray deck sections shall also be marked with the tray number on the

underside using metal stencils.

14.1.4 Tray hardware shall be packaged separately from the main tray

segments and marked with adequate identification.

14.2 Shipping

14.2.1 Tray and Packing components shall be properly packaged to prevent

damage during shipping.

14.2.2 Carbon steel trays and components shall be protected with a rust

inhibitor. The rust inhibitor must be easily removable.




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14.2.3 The Tray Manufacturer shall provide the type of inhibitor, and

procedures for the removal of inhibitor with proposal.

14.2.4 All stainless steel components shall be protected from salt water and

spray when shipped is by ocean freight.

14.2.5 All packages shall be marked with the order number, vessel equipment

number and tray number.

14.2.6 Tray parts and tray hardware for different tray designs shall not be

intermixed.

14.2.7 Copies of parts lists, assembly drawings and installation instructions

shall be included with the shipment.

14.2.8 The manufacturer shall provide the following supplementary material

hardware to compensate for installation losses and shall be the greater

of the following:

1. Bolts, nuts and washers, 10% or 10 of each size

2. Tray clamps, 5% or 5 of each size and type

3. Gaskets, 20%

4. Floating Valves 5 %

5. Random Packing 10 %

15 Drawings, Calculations and Data

15.1 The Tray Manufacturer shall prepare drawings, calculations, and data in

accordance with Form NMR-7919-2, Non-material Requirements.

15.2 Drawings and calculations, which are approved by the Design Engineer, shall

not relieve the Tray Manufacturer of the Tray Manufacturer's responsibilities to

comply with this specification.

15.3 The following technical data shall be provided by the Packing Manufacturer, for

review and approval:

1. Complete rating data including, liquid/vapor loading, and hydraulic

parameters

2. Installation instructions

Revision Summary

14 November 2009 Major revision.

http://standards/docs/Nonmaterial_Requirements/PDF/SA-7919-2.PDF

32-SAMSS-020

Documents

Transcript of 32-SAMSS-020