D-04 NOC

NATIONAL OIL CORPORATION

GENERAL ENGINEERING SPECIFICATION

GES D.04

LOW PRESSURE STORAGE TANKS (API 620)

Rev Date Description Checked Approved

0 1999 Issued for Implementation DL

Compiled by Teknica (UK) Ltd

GENERAL ENGINEERING SPECIFICATION LOW PRESSURE STORAGE TANKS (API 620)

GES D.04 of 22 Rev 0 1999

INDEX SECTION TITLE PAGE 1.0 SCOPE OF SPECIFICATION 4 1.1 Introduction 4 1.2 Other NOC Specifications 4 2.0 DEFINITIONS 5 2.1 Technical 5 2.2 Contractual 6 3.0 DESIGN 6 3.1 Codes and Standards 6 3.2 Additions and Exceptions 7 4.0 MATERIALS 10 4.1 Materials of Construction 10 4.2 Chemical Composition 11 5.0 FABRICATION/ERECTION 11 5.1 Introduction 11 5.2 Procedures 12 6.0 TOLERANCES 14 6.1 Fabrication 14 6.2 Curvature 14 6.3 Roundness 14 7.0 INSPECTION 14 7.1 Procedures 14 7.2 Methods 15 8.0 TESTING 17 8.1 Statutory Testing 17 8.2 Test Procedures 17 8.3 Nameplates 19 SECTION TITLE PAGE


GES D.04 of 22 Rev 0 1999

9.0 DOCUMENTATION 19 9.1 Introduction 19 9.2 Schedules/Reports 19 9.3 Data and Calculations 19 9.4 Drawings 20 9.5 Other Documents 20 9.6 Manuals 21 10.0 PRIOR TO SHIPMENT 21 10.1 Paintings and Coatings 21 10.2 Spares 21 10.3 Packing/Storage 21 10.4 Shipping 22 10.5 Warranty 22 DATA SHEETS Tank Data Sheet (4 sheets)


GES D.04 of 22 Rev 0 1999

1.0 SCOPE OF SPECIFICATION 1.1 Introduction 1.1.1 This specification covers the minimum requirements for design, materials, fabrication and erection,

inspection and testing of large, welded, low pressure carbon steel above-ground storage tanks. 1.1.2 These storage tanks shall be designed, fabricated, erected, inspected and tested in accordance with API

620, plus the additional requirements of this specification. 1.1.3 The tanks covered by this specification are designed for metal temperatures not greater than 250°F

(120°C) and with pressure in the gas or vapour space up to 15 psig (103 kPag). 1.1.4 Atmospheric storage tanks are covered by GES D.01. 1.1.5 This specification applies to equipment for refineries, onshore oil and gas, installations and processing

facilities. 1.1.6 The Purchase Order/Contract will state that the tanks will be purchased either by: (a) Owner buying tank materials and a local Contractor carrying out the erection, or (b) local Contractor carrying out procurement and erection. 1.1.7 The following storage tanks are not covered by this specification: (a) low pressure storage tanks for refrigerated products at temperatures from 40°F (4°C) to -60°F

(-50°C) which are designed to Appendix `R' of API 620 Standard; (b) low pressure storage tanks for liquified hydrocarbon gases at temperatures not lower than -270°F

(-168°C) which are designed to Appendix `Q' of API 620 Standard. Tanks for the above service conditions are specified in GES D.03. 1.1.8 The Vendor/Contractor shall comply fully with the provisions laid down in this specification. Any

exception must be authorised in writing by the Owner. 1.1.9 In the event of any conflict between this specification and the applicable codes and standards, the

Vendor/Contractor shall inform the Owner in writing and receive written clarification before proceeding with the work.

1.1.10 The tank foundations will be provided by the Vendor/Contractor responsible for the erection of the

tanks. 1.1.11 This General Engineering Specification will form part of the Purchase Order/Contract. 1.2 Other NOC Specifications Where indicated in this specification the following additional NOC Specifications shall apply: GES H.07 - Fire-fighting Facilities for Storage Tanks GES W.01 - Welding Procedure and Welder Qualification GES W.02 - Storage and Control of Welding Consumables


GES D.04 of 22 Rev 0 1999

GES W.03 - Post-Weld Heat Treatment of Materials GES X.01 - Surface Preparation and Painting Application GES X.02 - Colour Coding of Equipment and Piping GES X.03 - External Protective Coatings 2.0 DEFINITIONS 2.1 Technical The technical terms used in this specification are defined as follows: Low Strength Tank Steel Steels having a specified minimum yield strength equal to or less than 43,000 psi (296 MPa) and a

specified maximum tensile equal to or less than 85,000 psi (586 MPa). High Strength Tank Steels Steel having a specified minimum yield strength greater than 43,000 psi (296 MPa) and a specified

maximum tensile strength equal to or less than 100,000 psi (689 MPa). Peaking Is the deviation of shell contour from a true circle at vertical joints. Peaking shall be determined over a

horizontal span of 36" (915 mm) centred on the weld. Banding Is the deviation of the shell at horizontal joints from a vertical line. Banding shall be determined over a

vertical span of 36" (915 mm) centred on the weld. Annular Plates Are bottom plates forming the annular ring upon which the shell rests. Production Impact Test Plates Coupon plates which provide the required impact test specimens for the weld metal and heat affected

zones in the finished product. Plate as Rolled Refers to the unit plate from a slab, or rolled directly from an ingot.


GES D.04 of 22 Rev 0 1999

2.2 Contractual The commercial terms used in this specification are defined as follows: 2.2.1 Owner The oil or gas company, an associate or subsidiary, who is the end user of the equipment and facilities. 2.2.2 Vendor The company supplying the equipment and material. 2.2.3 Contractor The main Contractor for a defined piece of work 2.2.4 Sub-Contractor A company awarded a contract by the Contractor to do part of the work awarded to the Contractor. 2.2.5 Inspection Authority The organisation representing the Owner or Vendor/Contractor that verifies that the equipment and

facilities have been designed, constructed, inspected and tested in accordance with the requirements of this specification and the Purchase Order/Contract.

2.2.6 Inspector A qualified individual representing the Owner, Vendor/Contractor or the assigned Inspection

Authority, who verifies that the equipment and facilities have been designed, constructed, inspected and tested in accordance with the requirements of this specification and the Purchase Order/Contract.

3.0 DESIGN 3.1 Codes and Standards 3.1.1 The design and construction of storage tanks shall comply with this specification as well as with codes,

standards and provisions indicated on the data sheets provided by the Owner. 3.1.2 The following codes and standards shall be used in conjunction with this document, as specified by the

Owner. ASME - American Society of Mechanical Engineers ASME Boiler and Pressure Vessel Code Section II - Material Specification Part A Ferrous and Part B Non-ferrous Section IIC - Specification for Welding Rods, Electrodes and Filler Metals Section IID - Material Properties Section V - Non-destructive Testing Section VIII - Pressure Vessels, Division 1 Section IX - Welding and Brazing QualificationsASME ASME B16.5 - Pipe Flanges and Flanged Fittings ASME B16.9 - Factory Made Wrought Steel Butt-welding Fittings ASME B16.11 - Forged Steel Fittings Socket Welding and Threaded ASME B16.20 - Ring-joint Gaskets and Grooves for Steel Pipe Flanges


GES D.04 of 22 Rev 0 1999

ASME B16.47 - Large Diameter Carbon Steel Flanges ASME B31.3 - Process Piping API - American Petroleum Institute API 620 - Design and Construction of Large Welded Low Pressure Storage Tanks API 2000 - Venting Atmospheric and Low Pressure Storage Tanks ANSI - American National Standards Institute ANSI A12.1 - Safety Requirements for Floor and Wall Openings, Railings and Toe Boards 3.2 Additions and Exceptions In addition to the minimum requirements of API 620 design code, the following shall be taken into

consideration: 3.2.1 Corrosion Allowance (a) Minimum corrosion allowance for tank components constructed from carbon steel shall be 1/16"

(1.5 mm) in sweet service and _" (3 mm) in sour and corrosive service. (b) The design diameter of anchor bolts and the design thickness of holding down straps, shall be

increased in all cases by _" (3 mm) as corrosion allowance. (c) Sacrificial anodes shall be provided to protect the inside wetted areas of the tank. The

composition of the anodes shall be compatible with the fluids and any corrosion inhibitor proposed by the Owner.

3.2.2 Design Loads (a) Design loading of the tank shall take into account cyclic operations, erection and test loadings. (b) During erection, start-up or operation, all applicable loads shall be considered as acting

simultaneously. (c) During hydrostatic testing, wind load (wind pressure) equivalent to a 35 mph (16 m/s) wind

velocity shall be considered acting simultaneously with the hydrostatic test load. (d) Roof live load shall not be less than 25 lb/sq ft (1.2 kPa) applied over the projected roof area. 3.2.3 Design Stress (a) The allowable design stress shall be in accordance with API 620. 3.2.4 Bottom Design for Cylindrical Tanks Tank bottom design shall be based on a maximum predicted settlement ≤ 3" (75 mm) at the shell,

including initial water loading of the tank, unless otherwise specified. Annular plates shall be 2 ft (600 mm) minimum width. The annular plate thickness shall be the greater of that required by API 620 or the following table:

BOTTOM SHELL COURSE THICKNESS

ANNULAR RING PLATE MINIMUM THICKNESS


GES D.04 of 22 Rev 0 1999

in mm in mm

≤ ½ ≤ 12.5 > ½ to _ > 12.5-22 > _ to 1¼ > 22-32 > 1¼ > 32

¼ 6 5/16 8 _ 9.5 7/16 11

Bottom plates shall be a minimum nominal thickness of ¼" (6 mm) and shall be square edged. 3.2.5 Nozzles and Connections Attachments and shell openings, wherever practicable, shall be located so that the welds do not overlap

shell seams or interfere with welds of other attachments. Nozzles NPS 2 and larger shall be flanged and shall have the same material grade as the tank shell.

Corrosion protection equivalent to that of the tank shall be provided. Connections smaller than NPS 2 shall be threaded, except for relief valve connections. 6000 psi

couplings shall be used for threaded connections. Additional coupling thickness shall be provided for corrosion allowance, as required. All couplings shall be installed with complete penetration welds. Half couplings welded to the outer surface of the sphere or tank roof may be used.

Nozzles and piping shall be designed in accordance with ASME B31.3. Partial penetration welding is acceptable for attachment of reinforcing pad plates. The design of top entry nozzles and associated piping, including piping supports, shall be approved by

the Owner. Splash pans shall be furnished at all flanged joints and at other connections, such as valve packing joints on the tank roof where leakage is possible. Splash pans shall be constructed of material suitable for exposure to the stored product and the environment.

Flanges larger than NPS 24 shall be per ASME B16.47, or designed per ASME Code Section VIII with

allowable stresses as determined by that code. Flanges designed per the ASME Code for connections with attached piping shall include the bending

moment from the attached piping. All shell openings shall be reinforced for the following conditions: (a) static liquid load, plus pressure, (b) loads imposed by the attached piping and effects of predicted long term settlement. Reinforcing plates at all nozzles and manholes shall be drilled and tapped ¼" NPT to permit air

pressure testing of welds. Holes shall be plugged with a plastic sealant. Manhole covers shall be hinged or provided with handling davits.


GES D.04 of 22 Rev 0 1999

The type of end termination, elevation, orientation and location will be specified, where necessary, to

match the Owner's mating piping connections. 3.2.6 Stairways and Platforms (a) Stairways and platforms shall be provided to allow access to operating valves. The use of

permanent ladders to service instruments, connections and access openings will be specified. (b) A stairway with handrail shall be provided from grade to the top of the tank. (c) Stairways shall have the following provisions: - maximum angle of stairway shall be maximum 45 degrees, - minimum effective tread width shall be 8" (200 mm), - minimum effective width of stairway shall be 30" (750 mm), - stair landings shall not be less than 30" (750 mm) square. (d) Guard railings and toe plates shall enclose all product nozzle, pressure relief device and instrument

attachments located on the top of the tank. (e) Platform flooring shall be steel grating. (f) Any pipe used as handrailing shall be seal-welded to avoid internal corrosion. (g) Railing and toe plates shall be carbon steel and per ANSI A12.1. 3.2.7 Pressure Relief Devices (a) Pressure and vacuum relief devices, conforming to API 2000 shall be furnished and installed by

the tank Vendor/Contractor, unless specified otherwise. (b) If the number, type and size of pressure and vacuum relief devices have not been specified, the

Vendor's/Contractor's proposals shall be submitted to the Owner for approval. 3.2.8 Instrumentation (a) Where instruments are to be supplied by the Vendor/Contractor, the Vendor/Contractor shall

submit with the tender documents the manufacture and model type of all instruments for approval by the Owner.

3.2.9 Painting, Thermal Insulation Systems (a) Metal surface preparation, painting and paint systems shall be as per GES X.01, GES X.02 and

GES X.03. Alternative coating systems require the Owner's approval. (b) Vendor's/Contractor's proposals to use thermal insulation materials and thicknesses alternative to

those specified shall be submitted to the Owner for approval. 3.2.10 Fire-fighting Facilities (a) For fire-fighting facilities refer to GES H.07.


GES D.04 of 22 Rev 0 1999

(b) The tank Vendor/Contractor shall furnish and install firewater deluge system and components,

terminating at the laterals at the base of the tank. 3.2.11 Auxiliary Piping Systems The supply, erection and testing of piping and components for the following systems will be by the

Vendor/Contractor, unless stated otherwise: - product fill and discharge piping within the diked area, - manual sampling systems, - Pressure relief device discharge piping and risers; - firewater deluge and spray systems from the laterals at the base of the tank to tie-in points. 4.0 MATERIALS 4.1 Materials of Construction Materials shall be in accordance with API 620 and the additional requirements of this specification. 4.1.1 A complete material specification shall be submitted with the Vendor/Contractor's bid proposal. 4.1.2 Annular plates shall be of the same material specification and grade as the lowest shell course. 4.1.3 Pipe and formed plate used for nozzles, manhole necks and flush-type clean-out fitting assemblies shall

comply with the following table:

MATERIAL LIMITATION MATERIAL SPECIFICATION

SEAMLESS WELDED

Pipe Attachment to steel having a yield strength < 43,000 psi (296 MPa)

ASTM A53, A106 GrB or C API 5L

Not permitted

Attachment to steel having a yield strength > 43,000 psi (296 MPa)

ASTM A 106 GrB or C

Not permitted

Formed Plate Same as plate to which component is attached. Component to be fabricated using full penetration and full fusion weld.

4.1.4 If impact testing is required by API 620, tests shall be conducted per ASTM E23 using the Charpy Vee

(Type A), specimens shall be taken per ASTM A370 for plate materials, and per ASTM A333 for pipe materials.


GES D.04 of 22 Rev 0 1999

The required number of impact tests to be made are as follows: (a) Plate Materials An impact test shall be made on each plate "as rolled". (b) Pipe Materials The number of tests shall be per ASTM A333, except that the test specimens shall be taken from

the thickest pipe from each heat. 4.1.5 Materials for permanent structural attachments, welded to the shell, shall be of the same nominal

composition. 4.1.6 Cast iron fittings shall not be employed on the shell or bottom. 4.2 Chemical Composition 4.2.1 The carbon equivalent of carbon steel plate used for the tank shell, shell nozzles, annular plates and

bottom plates, as defined by the equation below, shall meet the following limits: Carbon Equivalent (CE) is: CE = C + (Mn)/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 = 0.45% C = 0.28% max All elements shall be determined for each heat of material. 5.0 FABRICATION/ERECTION 5.1 Introduction Fabrication and erection shall comply with the requirements of API 620 code, and the additional

requirements of this specification. No fabrication shall commence until complete material certification has been received and written

approval of shop drawings, calculations, weld procedures plus welder performance qualifications has been received by the Vendor/Contractor.

Approval of material certificates and welder qualification certificates are the responsibility of the

Owner's Inspector and/or the Inspection Authority. Approval of the tank drawings, calculations and weld procedure are the responsibility of the Owner. The Vendor/Contractor shall notify the Owner of the proposed starting date of actual fabrication. Tank Vendor/Contractor shall provide erection tools for the Owner or his Contractor to erect and weld

the tank.


GES D.04 of 22 Rev 0 1999

5.2 Procedures 5.2.1 Plate Cutting and Preparation for Welding Carbon and carbon manganese steels may be cut to size, and bevelled by thermal or mechanical

methods consistent with accepted practice. 5.2.2 Welding Procedure and Procedure Qualifications Prior to carrying out any production welding, the Vendor/Contractor shall submit to the Owner his

proposed welding procedures. Welding procedures for field welding may be carried out away from the construction site. Testing and inspection shall be as per the requirements of API Standard 620 and GES W.01. Where impact testing is required by API 620, tests shall be made for each weld procedure qualification

test plate required per ASME Code, Section IX as follows: - impact tests shall be made on the weld metal and the HAZ; - impact tests shall be conducted at the design metal temperature; - impact specimens of the weld metal and HAZ shall be taken per API 620. Welding procedure qualification test welds shall be carried out under conditions simulating the worst

access and environmental conditions expected during production welding. 5.2.3 Welder's Performance Qualification Tests All welders and welding operators shall be qualified in accordance with API 620 and GES W.01.

Welder's performance qualifications shall be conducted at the construction site and in the Vendor's/Contractor's works. The Owner may require re-qualification of welder performance on site at his option.

5.2.4 Identification and Welders All welders qualified for the work shall be assigned identification numbers. A small area of the weld

reinforcement shall be ground flat and the welder's identification mark stamped in this area. As an alternative, "As-Built" drawings showing location and extent of welding carried out by each welder is acceptable.

Records showing the date and the results of qualification tests conducted by each welder, and the

identification mark assigned to him, shall at all times be available for scrutiny. 5.2.5 Production Control Test Plates Unless production control test plates are specified by the code or other statutory requirements, then the

Owner does not require such tests. When such tests are called for by the code or other statutory requirements, they shall be fabricated and

tested in accordance with those requirements.


GES D.04 of 22 Rev 0 1999

5.2.6 Preheat and Post-weld Heat Treatment Pre-heat and post-weld heat treatment shall be in accordance with API 620 code and GES W.03. 5.2.7 Welding (a) Holes shall not be made in shell plate for erection purposes. (b) All shell joints shall be complete penetration and complete fusion welds. (c) The shell to annular plate joint shall be a complete penetration complete fusion weld, or double

fillet `T'. If the `T' joint is used, the fillets shall be made with a minimum of 2-passes, and the minimum size of fillet shall be equal to the annular plate thickness. Tack welds for shell-to-bottom fillet welds, if used, shall be removed prior to welding fillets.

(d) Annular plates shall be butt-welded with complete penetration and complete fusion. (e) Bottom plates shall be 2-pass fillet welded to develop a minimum joint efficiency of 70%. (f) The qualification procedure for bottom fillet weld shall be: - using the same type of electrode (same manufacturer's designation), plate (same material

and thickness) and weld procedures, as will be used for the bottom, two linear feet (600 mm) of lap weld shall be made;

- three 3" x 18" (75 x 450 mm) tensile test strips shall be cut from this weld and tested at

the design metal temperature. The maximum breaking load of the strips shall be at least 70% of the specified or guaranteed minimum tensile strength of the unwelded plate at test temperature. Weld failure shall be at least 95% shear fracture;

- three cross sections of the weldment shall be polished and etched sufficiently to show the

weld's penetration into the base material. Complete fusion shall exist throughout each cross section. If the first pass destroys the vertical edge of the lap weld, a minimum of 3/32" peak penetration into the bottom plate shall be shown.

(g) Attachment welds for tank anchors, shell stiffeners, insulation supports, stairway clips, pipe

supports and similar components shall be continuously fillet welded. (h) Radial buttwelds between shell stiffener sections shall terminate approximately ½" (13 mm) from

the tank shell. (i) Single pass buttwelds and multiple pass electrogas, or electroslag vertical buttwelds are not

permitted. (j) Weld undercuts and excessive weld metal build-up which creates steep angles at corners of fillet

welds shall be repaired. (k) Mechanical caulking shall not be permitted. (l) The roof shall not have depressions that will permit accumulation of water. (m) Hardness of hot formed sections and of weld metal, and the related heat affected zone (HAZ) of all

welds, shall not exceed 225 Brinell for P1 materials. ("P" numbers are defined in ASME Boiler


GES D.04 of 22 Rev 0 1999

and Pressure Vessel code). 6.0 TOLERANCES Tolerance shall be in accordance with the API 620 Standard and the following additional requirements. 6.1 Fabrication Shell plates shall have dimensional tolerances as follows:

Dimension Tolerance in mm

Length Width Difference in Diagonals

± 1/16 ± 1.5 ± 1/16 ± 1.5 ± _ ± 3.0

6.2 Curvature The tolerance for peaking and banding of shell plates is ¼" (6 mm). 6.3 Roundness The radius of the shell measured at 12" (300 mm) above the bottom corner weld shall be within the

following tolerances which represent deviation from the average radius:

Tank Diameter ft m

Tolerance on Radius in mm

< 120 < 36 120 to 210 36 to 64 > 210 > 64

½ 13 1 25 1½ 38

The circumference shall be no smaller than the theoretical circumference for the specified diameter. The maximum permissible out-of-plumb of any single course, exclusive of banding effects, shall be ¼"

(6 mm). 7.0 INSPECTION 7.1 Procedures 7.1.1 All items of plant and equipment referenced within this specification shall be subject to inspection by

the Owner or his nominated Inspection Authority.


GES D.04 of 22 Rev 0 1999

7.1.2 Inspection shall be in accordance with API 620 code and this specification. All inspection activities,

including any special requirements, shall be agreed with the Owner and shall be incorporated within the agreed Quality Control Plan provided by the Vendor/Contractor.

7.1.3 All operators of NDE equipment shall have thorough knowledge of the operation of the equipment to

be used and shall hold an appropriate certificate of competence which is to be approved by the Owner. All NDE procedures and qualifications shall be subject to approved by the Owner.

Approval of all NDE records are the responsibility of the Owner's Inspector at the

Vendor's/Contractor's works or construction site. 7.1.4 Any approvals given by the Inspector does not relieve the Vendor/Contractor of any responsibility

regarding guarantees, workmanship or compliance with the code and this specification. 7.1.5 The Vendor/Contractor shall furnish the Inspector with all reasonable facilities to satisfy themselves

that the equipment is fabricated and tested in accordance with the relevant code and this specification. The Vendor/Contractor shall afford the Inspector the opportunity to witness all or some of the

following quality control checks. The details shall be agreed mutually between the Inspector and the Vendor/Contractor, prior to the commencement of fabrication.

(a) Welding procedure and operator qualification work, (b) Examination of rolled and welded shells, (c) Identification of materials against Mill Test Certificates and impact tests, (d) Welding examination, (e) Examination of radiographic film, (f) Internal and external examination of tanks, (g) Pressure tests, (h) Final dimensional check (inc. peaking and banding), (i) Examination after cleaning, (j) Examination after painting, if specified, (k) Verification of code nameplate details, (l) Review and signature of Vendor's/Contractor's dossiers. 7.2 Methods Inspection shall be in accordance with API 620 and the additional requirements of this specification. 7.2.1 Shop Inspection Shop inspection shall be made of the following tankage and components. Shell plates may be inspected at the tank fabrications shop or the mill, or both, by the Owner's

Inspector. Inspection includes witnessing tests of physical properties.


GES D.04 of 22 Rev 0 1999

Manholes, nozzles and flush-type clean-out fittings shop welded into a tank plate or reinforcing pad, shall be inspected by the Owner's Inspector at the tank fabricator's shop.

7.2.2 Visual Inspection Final inspection shall be carried out after the removal of all mill scale, dirt, grit, weld spatter, paint, oil

or other foreign matter from the tanks. It is the Vendor's/Contractor's responsibility to offer the tanks in a suitable condition for the Inspector's

examinations, including the provision of scaffolding/ladders when required. 7.2.3 Inspection of Tank Bottom (a) Annular plate butt joints shall be 100% radiographed, or where radiography is not possible they

shall be magnetic particle inspected from the topside after completion of the root pass, and again after completion of the full weld.

(b) Bottom to shell joint shall be inspected as follows: - the inner fillet weld shall be inspected prior to welding the outside fillet weld. Leak testing shall be performed with penetrating oil after removal of slag. Oil shall be removed before welding the outer fillet, - the gap between the bottom shell ring and the lap welded bottom plates at radial weld

location shall be a maximum of _" (3 mm). (c) All bottom plate joints shall be vacuum tested using a vacuum box and soap suds solution. 7.2.4 Radiographic Method of Inspecting Shell Joints (a) For low strength tank steels, radiographic examination of welding shall be per API 620, and the

following additional requirements: - for shell plates over _" (22 mm), vertical joints shall be fully radiographed; - for shell plates _" (22 mm) or less, one spot radiograph shall be taken for every 50 ft

(15.25 m) of weld, and at all junctions of vertical and horizontal joints at a location selected by the Inspector;

- if submerged arc machine welding is used, the first 3 ft (0.9m) of complete weld made by each machine for each tank shall be 100% radiographed;

- if electro-gas welding is used, the first 8 ft (2.4 m) of completed weld made by each machine shall be fully radiographed, and all starts and stops in the welded joints shall be radiographed;

- quality control shall be done progressively throughout the job. (b) For high strength tank steels, and for tanks with a product of specific gravity greater than 1.0

radiographic requirements shall be the same as for low strength tank steels, except that all vertical seams shall be 100% radiographed.

(c) Reference markers, on each film, shall include the tank and seam numbers. Each film shall have at

least two reference markers indicating the correct location of the film on the weld. (d) Radiograph film length shall be 10" (254 mm) minimum, or the full length of the weld if less than

10" (254mm). 7.2.5 Magnetic Particle and Liquid Penetrant Testing Magnetic particle or liquid penetrant examination shall be carried out in accordance with API 620.


GES D.04 of 22 Rev 0 1999

8.0 TESTING 8.1 Statutory Testing 8.1.1 The Vendor/Contractor shall conduct the hydraulic test on the tank in accordance with API 620 and

this specification. 8.1.2 The tests shall be carried out in the presence of the Owner's Inspector. 8.1.3 Prior to testing the Vendor/Contractor shall submit his test procedure in writing to the Owner for

approval. 8.1.4 The hydrostatic test shall not produce a stress in the bottom shell course greater than 90% of the

specified yield stress at room temperature. 8.2 Test Procedures 8.2.1 Prior to carrying out the hydrostatic test, all backing and reinforcement plates shall be leak tested using

air via a tell-tale hole and soap and water. 8.2.2 No type of preservative or paint shall be allowed to cover any joint, mechanical or welded, before the

test is complete. 8.2.3 The Vendor/Contractor shall be responsible for: (a) Hydrostatically testing the tank, including filling and emptying. If salt water is used for testing

and will remain in the tank for more than 30 days, an oxygen scavenger and a corrosion inhibitor at 50 ppm (vol) each respectively, shall be added. After testing, the tank shall be drained and thoroughly rinsed with clean fresh water.

(b) Installing the covers of deck manholes in floating roofs, before filling. (c) Furnishing, laying and removing all lines required for testing from the water supply point to the

water disposal point. (d) Cleaning out any standing water, silt or other dirt, left in a tank after hydrostatic testing so that the

tank interior is clean and ready for operation. (e) Ensuring adequate venting arrangements from the roof during filling and draining.


GES D.04 of 22 Rev 0 1999

8.2.4 Filling The water filling rate for testing shall not exceed the following:

BOTTOM COURSE THICKNESS in mm

TANK PORTION FILLING RATE in/hr mm/hr

< _ 22 Top course Below top course

12 300 18 450

≥ _ 22 Top third Middle third Below Third

9 225 12 300 18 450

8.2.5 Settlement Measurements Shell and bottom settlement measurements shall be made by the Vendor/Contractor per

the following: (a) Shell settlement measurements shall be made after tank erection, prior to

hydrostatic testing and during water filling at the ½, ¾ and full levels corresponding to design liquid height. Level readings shall be accurate to within ± 1/16" (± 1.5 mm). The minimum number of measurement locations shall be given below:

Tank Diameter ft

m

Number of Measurement Locations (equally spaced around the tank shell)

< 150 ≤ 46 > 150 to 225 > 46

to 69 > 225 to 325 > 69

to 99 > 325 > 99

16 24 32 48

(b) Bottom internal measurements shall be made after hydrostatic testing. Such

measurements shall be made at 10 ft (30 m) spacing from the centre on the radius, and the following:

Tank Diameter ft m

Number of Diameter Axes

≤ 150 ≤ 46 > 150 to 225 > 46 to 69 > 225 to 325 > 69 to 99 > 325 > 99

4 6 8 10

Additional measurements shall be made in the annular plate region at approximately 30 ft

(10 m) intervals around the tank shell. A set of at least 3 measurements shall be made at each location commencing inward from the inside surface of the tank shell and equally spaced on a radial line. A 100% visual examination shall be made of the tank bottom to detect any localized depressions. The


GES D.04 of 22 Rev 0 1999

location and extent of depressions shall be indicated on the tank bottom plate layout drawing. A full report of settlement measurements and tank bottom depressions shall be made

together with the results of the hydrostatic test including leakage rates. 8.3 Nameplates 8.3.1 A nameplate shall be provided on each tank in accordance with API 620. 8.3.2 The nameplate shall be of stainless steel stamped or engraved with the required information. 9.0 DOCUMENTATION 9.1 Introduction 9.1.1 This section covers the documentation requirements for the design, materials, fabrication,

inspection and testing. 9.2 Schedules/Reports 9.2.1 For each tank, the Vendor/Contractor shall supply with the tender, a schedule showing submission

of all documents for review and approval, proposed sub-contractors and material procurement and a production/erection programme.

9.2.2 The Vendor/Contractor shall submit with the tender a Quality Control Plan for the contract. 9.2.3 After the Purchase Order/Contract award, monthly reports on design, material procurement and

production progress shall be submitted to the Owner. 9.3 Data and Calculations 9.3.1 For each tank, the manufacturer shall supply with the tender, a completed Tank Data Sheet

containing all the relevant information necessary for appraisal of the mechanical design by the Owner. Also included shall be any additional drawings, specifications, etc and a list of any proposed subcontractors.

The documents shall be submitted for approval/review to the Owner and to the Inspection

Authority within the periods agreed between the Owner and Vendor/Contractor. It shall be the responsibility of the Vendor/Contractor to ensure that the production schedule of the tank takes into account documentation submission periods, plus a three week approval review period by the Owner and/or the Inspection Authority.

The Vendor/Contractor shall be responsible for obtaining approvals from the Inspection

Authority. 9.3.2 All calculations shall be carried out in a clear and logical manner. Where conditions involve the

use of formulae or methods not specified in the design code, the source of these formulae or methods shall be clearly referenced.

Computer calculations will only be accepted if all input is shown, together with

calculated values of intermediate terms and factors and options chosen, as well as final calculated dimensions, stresses or other values. The computer program shall be validated to the satisfaction of the Owner.


GES D.04 of 22 Rev 0 1999

9.4 Drawings 9.4.1 The following drawings listed in paragraph 9.4.2 to 9.4.5 shall be sent by the tank

Vendor/Contractor to the Owner and/or the Inspection Authority for review and approval. 9.4.2 The plating drawings, shall as a minimum, show the position of all through thickness welds,

together with material thicknesses and specifications. In addition, it shall clearly indicate the welding procedure specification which is applicable to each weld. The plating drawing may be combined with the general arrangement drawing, provided that this drawing clearly indicates the same information.

9.4.3 General arrangement drawings shall show the relative location and main dimensions of all

components including elevations and orientations of nozzles. In addition, the following information shall be included on the assembly drawings: - nozzle schedule, - list of related drawings and procedures, - operating conditions, - design conditions, - corrosion allowance, - hydrotest, - NDE requirements, - design code and main standards/specifications, - weight, empty, operating, full of water, - painting requirements, - general notes covering specified requirements, - mechanical loading conditions (e.g. nozzle loads, wind, etc). 9.4.4 Detail drawings which may be included on the general arrangement shall include thicknesses and

dimensions of all components, weld details, machining and surface finish requirements, gasket and nameplate details.

9.4.5 As-built drawings may be the general arrangement drawings marked-up with the actual as-built

dimensions. 9.4.6 Drawing sizes shall conform to ISO Standard A1 to A4. All drawings shall be suitable for

microfilming on 35 mm film mounted in aperture cards. Where drawings are CAD generated, two (2) sets of copy disks shall be supplied.

9.5 Other Documents 9.5.1 Previously qualified weld procedure may be proposed by the Vendor/Contractor, provided all

welding and testing was witnessed by an independent third party and are supported by evidence of successful previous application. Evidence shall be in the form of quality records of previous applications.

9.5.2 NDE procedures shall include the general procedure to be utilised for each type of NDE

employed, together with detailed technique sheets for each applicable joint configuration proposed for each vessel.

9.5.3 Deviations from the requirements of the Owner's specification shall be technically justified and

have the written approval of the Owner.


GES D.04 of 22 Rev 0 1999

9.6 Manuals 9.6.1 Data Book On completion of fabrication, the Vendor/Contractor shall submit to the Owner, two (2)

copies of the Tank Data Book. They shall contain the following: - all drawings, including `as-built' drawings, - all calculations, - NDE procedures and records, - hydrotest procedure and certificates, - material test certificate, - welding procedure/welder qualification certificates, - inspection certificates, - nameplate rubbing or photograph, - heat treatment procedure and records, - tank data sheets (as-built), - certificate of compliance as per API 620. 9.6.2 The Vendor/Contractor shall supply the Owner one set of reproducible original drawings. 10.0 PRIOR TO SHIPMENT 10.1 Painting and Coatings 10.1.1 Surface preparation, painting and painting materials shall be in accordance with GES X.01, GES X.02

and GES X.03. 10.1.2 Shop prefabricated plates intended for site welding shall be left with a 2" (50 mm) margin, unprimed. 10.1.3 With the written agreement from the Owner, the unprimed margins may be protected for transport,

prior to site welding, by a special weld preparation coating or a weldable prefabrication primer. 10.2 Spares The Vendor/Contractor shall submit with his proposal a priced list of recommended

spares for start-up and two years normal operation. 10.3 Packing/Storage 10.3.1 This section describes the minimum requirement for the preservation and protection of the equipment

during transportation and storage, prior to unpacking. 10.3.2 The probable storage period will be specified in the Purchase Order/Contract and shall extend from the

time of despatch to the time of unpacking at site. If the storage period is not stated, a minimum period of 24 months shall be assumed. All packing shall be suitable for sea freight.

10.3.3 The following preparation for shipment shall be a minimum requirement. - After mechanical completion at the works, the materials and equipment shall be

left in a clean dry condition.


GES D.04 of 22 Rev 0 1999

- The Vendor/Contractor shall be responsible for loading and anchoring the items to prevent damage during shipment.

10.3.4 Any additional preservation/protection requirements for sea transport shall be advised by the

Vendor/Contractor. 10.3.5 Equipment preservation and protection shall be adequate to enable the equipment to be delivered

without suffering damage or deterioration. 10.3.6 Adequate supports and bracing shall be fitted to prevent distortion of tanks and parts of tanks during

shipment. 10.4 Shipping 10.4.1 All detailed arrangements are to be covered by the Vendor/Contractor and the Purchase

Order/Contract. 10.4.2 All relevant equipment and materials shall not leave the Vendor/Contractor's works for shipment until

the release has been approved by the Owner's Inspector. 10.5 Warranty 10.5.1 The Vendor/Contractor shall warrant the tank, specified materials and services supplied against any

defect for a period of 12 months after commissioning or 24 months from the date of delivery to the site, whichever is the shorter period, or for the period stipulated in the Purchase Order/Contract.

10.5.2 Should any item be found defective, the Vendor/Contractor shall be responsible for all costs associated

with restoring the tank and equipment to the standard specified by the Purchase Order/Contract. S:\NOC9077\ADMIN\SPECIFICATIONS\D-SERIES\D-04\GESDO4RF

DATA SHEET No.

TANK P.O. / CONTRACT No.

CLIENT

PLANT LOCATION SHEET 1 of 4

SERVICE ITEM No. No. of UNITS

OPERATING AND DESIGN DATA

1 Vendor / Contractor2

3 Location 4 Fluid Stored5 Operating Press/Temp psig/°F6 SG of Liquid 7 Design Liquid Head ft8 Design Code9 Internal Design Pressure Tank in wg Coil psig10 External Design Pressure Tank in wg Coil psig11 Design Metal Temp Tank Coil 12 Min. Mechanical Design Temp. °F13 Tank Dia ft Tank Height ft14 Pumping Rate In / Out In Out usgpm15 Breathing Rate In / Out ft³/h at bar and °F16 Corrosion Allowance in 17 Inert Blanket Yes/No 18 Hazard Considerations19 20 Uniform Live Load lb/ft² Special Roof Load lb/ft²21 Foundation Type Maximum Rainfall in/hr22 Wind Design Code Wind Velocity mph23 Earthquake Design Code/ Zone /Zone 2 Earthquake Factor24

25

26 27 Shell Roof28 Bottom Reinforcement29 Nozzle Flanges Nozzle Necks30 Fittings31 Structurals32 Fixed Internals Removable Internals33 External Attachments 34 Internal Bolting / Nuts External Bolting/Nuts35 Gaskets36 Floating Roof Seal37 Internal Lining/Coating 38 Heating Coil & Nozzles 39

40

41

42

43

44

45

Revision No./DatePrepared by/DateAuthorised by/DatePurpose(C) 1999 NATIONAL OIL CORPORATION. The information on this sheet may be used only for the purpose for which it is supplied by NOC.

K:\nocspecs\SPECIFICATIONS\d-series\d-04\Dd0401r0.xls Sheet1

PAINTING

MATERIALS

DATA SHEET No.


CLIENT



CONSTRUCTION

1 Vendor / Contractor2

3 Roof Type Supported Self Supported Floating Covered Floating4 Roof Slope or Radius: Roof to Shell Details: 5 Roof Plate Seams: Lap Butt Bottom Plate Seams: 6 Bottom Plate Slope:7 Intermediate Wind Girder Top Girder Used as Walkway Yes/No8 Anchor Bolts: Yes No9 Insulation: Yes/No Thickness mm Density lb/ft³10 Weight Empty: lb11 Weight Full of Operating Fluid lb12 Weight Full of Water lb13 Nominal Capacity ft³ 14 Max. Overturning Moment at Base lb.ft15 Maximum Shear at Base lb16

17 Hydrostatic Test Full of Water18 Weld Examination Radiography 19 Supplementary Ultrasonic 20 Sectioning 21 Leak Testing Bottom 22 Shell 23 Roof 24 Mill Test Report Required / Not Required25

26

27

28 Stairway Type: Circular Straight Ladder Landings 29 Stairway Supplied By: Handrailing Yes/No 30 Walkway Width: ft Scaffold Hitch Yes/No 31 Draw Off Sump: Standard Special Yes/No32 Internal Pipe Swingline Suction Nozzle 33 Heating Coil Yes/No Surface Area ft²34 Roof Drain Hose Jointed Syphon35

36 Breather Valve: Yes/No Type: By:37 Flame Arrestor Yes/No Type: By:38 Level Indicator Yes/No Type: By:39 Dip Hatch Yes/No Type: By:40 Insulation Supports Yes/No Type: Supplied By: 41 E STANDARDS42

43

44

45 Revision No./DatePrepared by/DateAuthorised by/DatePurpose(C) 1999 NATIONAL OIL CORPORATION. The information on this sheet may be used only for the purpose for which it is supplied by NOC.


TANK ATTACHMENTS

DATA SHEET No.


CLIENT



SKETCH

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45



DATA SHEET No.


CLIENT



1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23



REINFORCING

PADS

THKO/D

NOZZLE

ATTACH

-MENTS

SERVICEANGLE

(A)

RAD

(R)

DISTANCE

from

REF. T.L.

(E)

STAND

OUT

(L)

NOZZ

SCH

FACETYPECLASS

ANSI B16.5

API 605

FLANGES

SIZEREF

No.

D-04 NOC

Documents

Transcript of D-04 NOC