FF-178-12-2211-S004 Tank specification_B.pdf

DESARRROLLO DESARRROLLO DE LA INGENIERA CONCEPTUAL CONCEPTUAL Y B#SICA DEL PROYECTO DE EXPANSI%N DE PRODUCCI%N DE 105 MBD A 160 MBD

N Documento PSSA :

N Proyecto : P!gina :

FF-178-12-2211-S004

178

N  Proyecto ICHQ Fase del Proyecto N Documento ICHQ :

1 of 19

5083E

BASIC DESIGN

Rev.

5083E-1-FFX-D-2500-M4DETN-0001

B

STORAGE TANK SPECIFICATION FS

B A REV.

16/04/12 23/03/12 23/03/12 FECHA

19 19 P &G

NCORPORACI$N DE COMENTARIOS EMISI$N PARA COMENTARIOS DESCRIPCI$N

DERECHOS RESERVADOS

WW / ZXG

WW / ZXG REV. APROB. ELAB. ICHQ APROB No. Documento HQCEC

APROB. PSSA

5083E-04-2000-M20-111-003

Este documento es propiedad de PSSA. No se permite la divulgaci( divulgaci(n u otro uso de este documento sin la previa autorizaci( autorizaci( n escrita de PSSA.

FF-178-12-2211-S004_ Tank specification_Rev B.

LXB LXB

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Archivo Electr (nico:

FF-178-12-2211-S004_B

DESARRROLLO DE LA INGENIER A CONCEPTUAL Y B#SICA DEL PROYECTO DE EXPANSI%N DE PRODUCCI%N DE 105 MBD A 160 MBD

N Documento PSSA : FF-178-12-2211-S004

N Proyecto : P !gina : 178

N Proyecto ICHQ Fase del Proyecto N Documento ICHQ :

2 of 19

5083E

BASIC DESIGN

5083E-1-FFX-D-2500-M4DETN-0001

Rev.

B

CONTENT

1 GENERAL ................................................................................................................4 1.1 Scope ....................................................................................................................4 1.2 Codes, Standard and Specifications......................................................................4 1.3 Data / Certification.................................................................................................7 1.4 Submittals..............................................................................................................7 2 MATERIALS .............................................................................................................8 3 DESIGN....................................................................................................................9 3.1 General..................................................................................................................9 3.2 Design Data.........................................................................................................11 3.3 Fixed Roofs .........................................................................................................11 3.4 Open Vents .........................................................................................................12 3.5 Floating Roofs .....................................................................................................13 4 INTERNALS AND ACCESSORIES........................................................................14 5 FABRICATION AND ERECTION ...........................................................................14 6 TOLERANCES .......................................................................................................15 7 INSPECTION AND TESTS ....................................................................................16 7.1 Surveys ...............................................................................................................16 7.2 Sectioning............................................................................................................16 FF-178-12-2211-S004_ Tank specification_Rev B.

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DESARRROLLO DE LA INGENIER A CONCEPTUAL Y B#SICA DEL PROYECTO DE EXPANSI%N DE PRODUCCI%N DE 105 MBD A 160 MBD


N Proyecto : P !gina : 178

N Proyecto ICHQ Fase del Proyecto N Documento ICHQ :

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5083E

BASIC DESIGN

5083E-1-FFX-D-2500-M4DETN-0001

Rev.

B

7.3 Cleaning ..............................................................................................................17 7.4 Testing.................................................................................................................17 8 DATA SHEET CERTIFICATION ............................................................................18 9 GROUNDING SYSTEM .........................................................................................18 10 VENDOR*S GUARANTEE....................................................................................18


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DESARRROLLO DE LA INGENIERA CONCEPTUAL Y B#SICA DEL PROYECTO DE EXPANSI%N DE PRODUCCI%N DE 105 MBD A 160 MBD



FF-178-12-2211-S004

1.

GENERAL

1.1.

Scope

178


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BASIC DESIGN

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B

This Specification together with referenced codes and standards, Data Sheets, standard drawings and requisition defines basic technical requirements for the design, material, fabrication, erection and testing of erected cylindrical, welded steel storage tanks for +Expansion of the Area of Morichal and Jose Blending Plant from 105 MBD to 160MBD ,. Any deviations from these specifications are not acceptable, unless prior notification of such has been submitted, received and approved by the CLINENT or its representative only, in writing. Therefore the VENDOR shall be held responsible for the required engineering design, material procurement, fabrication, testing and shipment of all equipment assigned to him by the CLINENT in accordance with these specifications. Any special requirements not covered by the scope of these specifications shall be clearly indicated on Data Sheets. Where conflict occurs between special requirements, these specifications, or the requirements of the Code, it shall be the duty of the VENDOR to call such discrepancies to the attention of the CLINENT, who shall make final disposition of the problem. 1.2.

Codes, Standard and Specifications The following codes, standards and specifications, at latest edition, including applicable addenda, shall form a part of this specification ASME Standards l

SECTION II, Material Specification

l

SECTION V, Non-Destructive Examination.

l

SECTION IX, Welding And Brazing Qualifications.

l

B16.5 Steel Pipe Flanges and Flanged Fittings B16.47 Large Diameter Steel Flanges (Series A)

l

API Standard l

API-650 Welded Steel Tanks for Oil Storage.

l

API-620

Recommended Rules for Design and Construction of Large, Welded, Low Pressure Storage Tanks

l

API-653 Tank Inspection, Repair, Alteration, and Reconstruction

l

API RP 2015 Requirements For Safe Entry And Cleaning Of Petroleum Storage Tanks


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API RP 651 cathodic protection of aboveground petroleum storage tanks

l

API-2000 Atmospheric and Low Pressure Storage Tanks

l

API-2550 Method for Measurement and Calibration of Upright Cylindrical

B

Storage Tanks l

RP 2003

Protection Against Ignition Arising Out of Static, Lightning and Stray Currents

l

SPEC 5L Line Pipe.

l

API SPEC 12D

Specification for Field Welded Tanks for Storage of

Production Liquids ASTM Standard l

A6

General Requirements for Rolled Steel Plates, Shapes, Sheet Piling and Bars for Structural Use

l

A36

Standard Specification for Structural Steel

l

A53

Specification for Pipe, Steel, Black and Hot-Dipped, Zinc Coated Welded and Seamless

l

A105

Specification for Forgings, Carbon Steel, for Piping Components

l

A106

Specification for Seamless Carbon Steel Pipe for High Temperature

l

A307

Standard Specification for Carbon Steel Bolts and Studs, 60000 psi Tensile Strength

l

A325

Specification for Structural Bolts, Steel, Heat Treated, 120/105 Ksi Minimum Tensile Strength

l

A333

Specification for Seamless and Welded Steel Pipe for Low Temperature Service

l

A350

Specification for Forgings, Carbon and Low-Alloy Steel, Requiring Notch Toughness Testing for Piping Components

l

A370

Methods and Definitions for Mechanical Testing of Steel Products

ANSI Standards l

B16.9

B1.1

l l

B2.1

Steel Butt welding Fittings Unified Inch Screw Threads Pipe Threads


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FF-178-12-2211-S004

l

178


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B18.2.1 Cap

5083E

BASIC DESIGN

5083E-1-FFX-D-2500-M4DETN-0001

Rev.

B

Square and Hex Bolts and Screws, Inch Series, including Hex Screw and Lag Screws

l

B18.2.2

Square and Hex Nuts (Inch Series)

PDVSA CODE l

F-201

ATMOSPHERIC STORAGE TANKS

l

PDVSA O-201 SELECCI $N Y ESPECIFICACIONES DE APLICACI $N DE SISTEMAS PROTECTIVOS DE P INTURAS

l

PDVSA L-212 Caliente

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PDVSA FJ-251

l

PDVSA 90615.1.010 Fundaciones para tanques de almacenamiento

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PDVSA 0603.1.204 Water draw off sump

l

0603.1.203

Anclajes Para Tanques Cilindricos de Fondoplano

l

0603.1.204

SUMIDERO

l

10603.2.503 TOLERANCLAS PARA TANQUES DE ALMACENAMIENTO

l

90615.1.014 DISENO SISMORRESISTENTE DE TANQUES METALICOS

Aislamianto Termico para Tuberias y Equipos de Servicio en Diseno S -smico de Tanques Met !licos

N.A.C.E Standard l

RP 0193-2001 External Catholic Protection of on grade carbon steel storage tank bottom

l

RP 0169-2002 Control of external corrosion on underground or submerged Metallic Piping System ,.

AISC Standard l

Manual of Steel Construction-Allowable Stress Design. Ninth edition

AWS Standard l

A5.1

Specification for Covered Carbon Steel Arc Welding Electrodes

l

A22

Nondestructive Testing Symbols

l

D1.1

Structural Welding Code-Steel

ASNT Standard l

SNT-TC-1A-88

Recommended Practice

PROJECT SPECIFICATIONS: l

FF-178-12-2211-S001


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Mechanical Equipment design Criteria




FF-178-12-2211-S004

1.3.

178


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5083E

BASIC DESIGN

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5083E-1-FFX-D-2500-M4DETN-0001

B

Data / Certification VENDOR shall make detailed calculations covering the design of tanks shown on the Data Sheets and shall prepare any additional detailed shop drawings as required. VENDOR shall submit to CLINENT or duly authorized representative prints of shop drawings, welding procedures and detailed calculations for approval. Shop work shall not start until VENDOR has received prints of shop drawing and welding procedures approved by CLINENT. No subsequent revision may be issued to the shop without submitting then to CLINENT

1.4.

Submittals

1.4.1.

General For review, VENDOR *s drawings, calculations and engineering data submitted to CLINENT shall be in English language. The English System of units shall be used in all documents and drawings.

1.4.2.

Documents for approval VENDOR shall submit to CLINENT drawings and documents in the format and quantity specified in the Purchase Order for approval. However, review of the Vendor *s documents by CLIENT does not relieve the Vendor of responsibility for compliance with the applicable codes, standards, CLIENT drawings, and specifications, or the accuracy of shop dimensions. VENDOR shall not start fabrication before obtaining the approval of CLINENT. Drawings and documents shall be signed as checked prior to submittal. Unchecked data will not be accepted for review. VENDOR will not proceed with fabrication until authorized by CLINENT. As a minimum, the Vendor shall submit the following engineering data for review by CLIENT: l

All drawings required for the fabrication and erection of each tank. A drawing index for each tank is required and shall be resubmitted each time drawings are revised and reissued.

l

Welding procedures per API-650 Standard and AWS Specifications.

l

Heat treatment procedures (if apply).


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5083E

BASIC DESIGN

l

All required NDE and testing procedures.

l

Vendor design calculations.

5083E-1-FFX-D-2500-M4DETN-0001

Rev.

B

All subsequent revisions made by the Vendor to the data listed in above paragraphs shall be resubmitted to CLIENT for review.

2.

Certification of all materials is required. CLIENT reserves the right to review Certified Material Test Reports for all materials of construction at any time during shop fabrication or field erection. Vendor shall maintain these documents readily available for such review and shall submit them to CLIENT for final record if specifically requested. MATERIALS All carbon steel materials shall conform to the requirements of API Standard 650 and equipment Data Sheet. All high alloy materials shall conform to the material specifications listed on the individual equipment Data Sheets. The minimum thickness for tank bottom, shell and roof plates shall be in accordance with API Standard 650 unless noted otherwise. When materials of construction are not specified on equipment Data Sheets, the Vendor shall propose appropriate materials for the specified design conditions. Substitution of materials must have the written approval of CLIENT before being used. All welded attachments to the tank (both temporary and permanent attachments) shall be of the same material as the tank. All flanged connections (except man ways) shall be ANSI Class 150 minimum. Flanges for 24 inches and smaller nominal pipe sizes shall conform to ASME/ANSI B16.5. Flanges over 24 inches nominal pipe size shall conform to ASME B16.47(A). All connections shall be flanged. Vendor shall supply mill test certificates on all plates, pipe, nozzles, and appurtenances to be used in the construction of the tanks. Materials not having mill test certificates will not be accepted. Mill test certificates shall indicate yield and tensile strength, chemistry and impact values. Bolts shall be hot dip galvanized in accordance to ASTM A 307. Gasket material shall conform to service requirements based in product stored, temperature and fire resistance.


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9 of 19

5083E

BASIC DESIGN

Rev.

5083E-1-FFX-D-2500-M4DETN-0001

B

Gaskets for Man ways and Flush Type Cleanouts shall be one of the following: l

1/8, inch Stainless steel reinforced, graphite sheet Gasket, Flexitallic Flexicarb Wr.

l

1/8, inch Graphite Steel Gasket, Flexitallic Flexicarb Hs.

l

1/8, inch Garlock Style 3000 compressed non asbestos Gasket.

All platform and structure shall be hot dip galvanized. 3.

DESIGN

3.1.

General Capacities shall be as specified in Data Sheet. When requested in the Data Sheet, the tanks shall be calibrated (strapped) and Vendor shall furnish tank calibration tables as specified on the Data Sheet. Capacity sizing for hydrocarbon tanks shall be based on a frangible roof-toshell joint per API 650, and emergency venting capacity shall be provided per API Std. 2000. For floating roof tanks, the net working capacity is the liquid volume contained between the maximum operating level (24 inches [610 mm] below rim for fabric type seals) and the minimum operating level. For open top and fixed roof tanks, the net working capacity is the liquid volume contained between the minimum operating level and the maximum operating level (limited to the top of internal pipe of overflow or 3 inches (76 mm) below foam chamber connection or 6 inches (152 mm) below rim, whichever dimension is greater. The 6 inches (152 mm) dimension shall be increased as necessary to provide sufficient freeboard (slosh height allowance) when tanks are designed to the alternate method (API Standard 650, Appendix K ). The tank shell course thickness shall be designed according to the +1-foot method of API 650 ,. Calculation of the thickness by the +variable design point method, requires CLIENT approval. The tank shell thickness shall be calculated for liquid level (both operating and test condition) at the top of tank shell. The specific gravity used for the design shall be 1.0 . Use actual value when the specific gravity of the fluid is greater than 1.0.


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10 of 19

5083E

BASIC DESIGN

Rev.

5083E-1-FFX-D-2500-M4DETN-0001

B

The minimum nominal thickness of all internal and external structural members shall be 0.25 inches. Top shell angle on fixed roof tanks shall project outside tank and be double butt welded to tank shell. The tank shell to roof junction shall be designed to withstand the forces caused by sloshing of the liquid contents during an earthquake (see equipment Data Sheet for earthquake design requirements). As an alternate, the tank shell height may be increased to provide sufficient freeboard (slosh height allowance) to prevent any damage to the roof and upper shell. The Vendor shall state which design he proposes to use and shall submit calculations to the CLIENT, for review, to substantiate his design. Corrosion allowance shall be as specified on Data Sheet (but never be less than 1.5 mm) and shall be added to calculated shell and self-supporting roof thickness to minimum nominal thickness of bottom and supported roof plates; to nozzles and manholes and to all exposed surfaces of internal structural members and non removable internals. Hydrocarbon tanks shall have a foam distribution system mounted to the tank wall if noted in the Data Sheet. The foam system should be designed and installed to supply a foam blanket on the liquid surface for extinguishing a tank fire. The foam system shall meet or exceed the requirements of NFPA 15/30. The overall system shall have a separate foam system for each half of the tank. Shell nozzle connections shall be API Standard 650 regular type furnished with flanges as specified in point 4. As a minimum, one 24 inches (610 mm) API shell man ways and one 36 inches x 48 inches (914mm x 1176mm) extended neck flush type cleanout shall be furnished complete with cover, gaskets, bolts, nuts, handles, lifting lugs and davits on tanks for crude, heavy fuels, slop, recovered oil, emulsion breaking, skimmed oil, ballast tanks and tanks in which bottom sludge and water are deposited, with capacities of 2000 barrels or more. One 6 inches x 48 inches (914mm x 1176mm) cleanout shall be furnished. Cleanouts for tanks designed to Appendix A of API 650 shall be extended neck, flush type cleanouts. As a minimum, one 24 inches (610mm) API roof manway shall be furnished complete with cover, gaskets, bolts, nuts and handles on each tank. Vents shall be sized in accordance with API Standard 2000 unless otherwise specified. Bottom plates shall be lap welded per API 650 on the topside only. A two-pass weld shall be used to produce a full fillet weld. FF-178-12-2211-S004_ Tank specification_Rev B.

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FF-178-12-2211-S004

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5083E

BASIC DESIGN

5083E-1-FFX-D-2500-M4DETN-0001

Rev.

B

All vertical and horizontal shell joints shall be double butt-welded. All structural attachments to the tank shall be continuously seal welded. Protection against ignition of tank contents due to static electricity, lightning and stray current shall be in accordance with API RP 2003. A minimum of two grounding connections shall be used. Reinforcing plates, continuously seal welded to the bottom, shall be provided under all concentrated loads such as heating coils, support legs for floating roofs, and other internal construction. Wear plates / inch (6 mm) thick shall be installed under pipes discharging against the tank bottom and below any gage hatch or gage still pipe. When wear plates at horizontal tank mixers are specified, they shall be supported at least 2 inches (50 mm) above the tank bottom and be so designed that they may be removed for inspection of the bottom. Vendor shall identify the tank by nameplate and certificate of compliance, in accordance with API 650, Section 8, Figure 8-1 and 8-2. 3.2.

Design Data Wind girder and intermediate wind girder requirements shall be based on a wind velocity indicated in Data Sheet. Tanks shall be designed per API 650 Standard Appendix E; Seismic Data will be indicated on particular Data Sheet. Design metal temperature shall be 70 F (21C), unless noted otherwise on equipment Data Sheet. Maximum soil bearing pressure shall be indicated in the equipment Data Sheet. Design climatic conditions shall be in accordance with t o Mechnical Equipment design criteria:Nr. FF-178-12-2211-S001.

3.3.

Fixed Roofs Cone roofs must be self-supporting. Vendor may propose an alternate for supplying self-supporting dome when feasible and more economical. Internal clips shall be seal welded for corrosion protection. Seal welding of external clip may be required in some location. Lateral braces between outer bay rafters must be provided when unsymmetrical structural shapes are used for rafters and the tanks are located


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BASIC DESIGN

5083E-1-FFX-D-2500-M4DETN-0001

Rev.

B

in areas subject to earthquake. The bracing must be adequately sized for seismic zone as specified in the equipment Data Sheet, and shall not be less than the minimum required per API Standard 650. 3.4.

Open Vents

3.4.1.

Tank Service Requirements. A storage tank may have an open vent if contained liquid meets all of the following: l

Does not produce outdoors.

l

Be not degraded by moisture.

l

Does not require air emissions control per EPA regulation 40 CFR, Part 60.

l

Does not require pressure-vacuum vent valves per OSHA regulation 29 CFR 1910.106.

l

Be noncombustible, or be combustible but has both of the following: (1) Flash point of 150 F or higher. (2) Storage temperature below flash point.

If approved in writing by CLIENT, tanks may have open vents if liquid service will result in sticking or obstruction of pressure-vacuum vent valves. Internal floating roof tanks shall have open roof vents per requirements of API Std 650, Appendix H. 3.4.2.

Normally Stored Liquids. Liquids normally stored in open vented tanks are: Asphalt.

l l

Unfinished lubricating oil

l

Finished lubricating oil (if moisture from in-breathing of outside atmosphere does not degrade quality).

l

Treated water, boiler feed water, etc.

l

Fresh caustics.


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3.5.



13 of 19

5083E

BASIC DESIGN

5083E-1-FFX-D-2500-M4DETN-0001

Rev.

B

Floating Roofs Floating roofs shall comply with API Standard 650, Appendix C. The type of roof and seal to be provided shall be as specified on Data Sheet. The pontoon bulkheads shall be completely welded for liquid tightness. Roof supporting legs shall be adjustable to provide two minimum roof levels: one of them shall be the lowest possible for correct tank operation, and the other shall be 8 feet 0 inch, for maintenance purposes. A rolling ladder shall be furnished complete with self-leveling handrails and stair treads. Each compartment shall be provided with a liquid tight man way. Roof drains shall be at least 6 inches nominal pipe size closed drains with swing joints. If a secondary roof drain shall be installed to prevent the accumulated water level on the roof drain shall have all apparatus which applies to primary drain, including separate sump and check valve. Automatic bleeder vents shall be installed on the roof deck. Electrical shunts shall be provided on the floating roof above all seals to ground the roof to the shell. A secondary electrical shunt consisting of a continuous electrical cable connected to the roof and tank wall shall be supplied. Cable may be routed along, and attached to the rolling ladder. Vendor shall include all appurtenances and accessories required for the proper performance of each floating roof tank in its specified service. These shall include (but not be limited to) the following: l

Rim seals and rim vents when required.

l

Weather shield and foam resilient fabric covered type seals.

l

Automatic bleeder vents.

l

Anti-rotation device.

l

Electrical bonding and grounding as recommended in API RP 2003.

l

Roof supports with operating and cleaning level adjustments. (Level shall be set at 2 *-6, [735mm] from bottom for operating, or at a level for the seal to clear top of manhole or feed nozzles, and at 8 *-0, [196mm] from bottom for cleaning).


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l

4.



14 of 19

5083E

BASIC DESIGN

Rev.

5083E-1-FFX-D-2500-M4DETN-0001

B

Gauges platform and rolling stair with self-leveling treads.

INTERNALS AND ACCESSORIES Vendor shall furnish and install all internals and accessories as noted on Data Sheet and/or as specified in the contract. All free vents shall be provided with removable screens. Heating coil or heater nozzles (when applicable) shall be furnished with a 6 inches long internal projection beveled for field welding. Firefighting system piping and accessories for the tanks shall be provided and properly supported, a CLIENT connection shall be a flange provided at 24 inches from the ground. Stairways, landing platforms, ladders, and handrailing shall be provided. Unless otherwise stated, ladders shall not be used except for tanks with heights of 20 feet (6.1 m) or less. Safety gates or handrails shall be provided at the open ends of all platforms and walkways. Gate and handrail systems shall be approved by CLIENT. Tanks shall have a high handrail mounted on the roof on both sides of a stairway or ladder landing. Handrails shall extend at least 6 feet (1.83 m) beyond any point requiring routine access. Platforms shall extend from the stairway onto the roof to provide access to all sides of roof nozzles requiring routine access, such as manholes, vent nozzles, steam-out connections or foam heads. Platforms shall fully encircle the roof nozzle(s). Stairways for insulated tanks shall be double stringer type supported by a minimum number of brackets. Handrails shall be provided on both sides if the clearance between tank shell and stringer exceeds 8 inches (196mm).

5.

FABRICATION AND ERECTION Prior to the start of erection, Vendor shall inspect each tank foundation for levelness, and formally notify CLIENT of the acceptance or rejection. Tanks shall be welded and inspected in accordance with API Standard 650.


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15 of 19

5083E

BASIC DESIGN

5083E-1-FFX-D-2500-M4DETN-0001

Rev.

B

Vertical weld seams in bottom shell courses shall be at least 212 inches (94mm) away from bottom annular ring radial weld seams. All structural clips and other attachments to the tank shall be welded with continuous fillet welds all around and shall be of the same material as the tank. All temporary erection attachments welded to the interior or exterior of the shell or to the bottom shall be removed by arc gouging and the weld area repaired and ground smooth. Temporary erection attachments shall be of the same material as the tank shell and bottom. The interior of tanks to be internally lined or coated shall have all edges rounded to a minimum of 1/8 , radius. All internal welds shall be seal welded, ground smooth and free of surface porosity, pockets, and high spots. All weld splatter shall be removed. Any additional surface preparation shall be performed by the Vendor as specified on Purchaser *s tank drawing. Vertical weld seams on API Standard 650 tanks shall be located to avoid openings wherever possible. Vendor shall comply with all minimum weld clearance requirements. If the location of connections or attachments, which are established by CLIENT, does not permit adequate clearance, the matter shall be referred to CLIENT for decision. Cutting edges shall be provided with rounded corners. This will prevent excessive abrasion on tank lining or painting. The first course shall be plumb and level all around, with maximum permissible top tolerances of 1/16 inches between maximum and minimum elevations in any 30 feet of arc length and 3/8 inch between maximum and minimum elevations of the entire course. Nozzle locations shall not deviate more than 1/4 inch (6mm) either vertically or horizontally from the position shown on the Data Sheets. Flange bolt holes shall straddle vertical centerline. Flange face of nozzles shall be within one (1) degree of the normal plane, for nozzles up to 12 , diameter. Flange face of man-ways shall be within two degrees of the normal plane. 6.

TOLERANCES Tank erection and foundation tolerances shall be in accordance with API Standard 650, unless otherwise specified.


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5083E

BASIC DESIGN

5083E-1-FFX-D-2500-M4DETN-0001

Rev.

B

The maximum out of plumbness of the top of the shell relative to the bottom of the shell shall not exceed 1/200 of the total height. Tank nozzles (excluding manholes) shall be installed within the following tolerances: l

Projection from outside of tank shell to extreme face of flange 0 plus or minus 5mm (3/16 inch).

l

Elevation or radial location 0 plus or minus 6mm ( / inch).

l

Flange tilt in any plane, measured on a diameter across the gasket surface 0 plus or minus 1 degree for nozzles over 12 , diameter.

Tank manholes shall be installed within the following tolerances: l

Projection from outside of shell to extreme face of flange diameter 0 plus or minus 12mm.

l

Elevation or radial location 0 plus or minus 13mm ( 1 inch).

l

Flange tilt in any plane, measured on a diameter across the gasket surface 0 plus or minus 1 degree.

7.

INSPECTION AND TESTS

7.1.

Surveys Upon completion of welding of the first course shell plates and prior to erection of the second course, a survey of levelness, circularity, and plumbness shall be performed by the Vendor. Measurements shall be taken adjacent to and midpoint between each vertical weld seam. The locations shall be clearly marked and identified with reference number, and shall be used for any subsequent surveys as well as the final survey. During the course of tank erection, additional surveys shall be performed as deemed necessary by the Vendor. A final survey shall be performed by the Vendor after all roof framing has been installed. Vendor shall submit the results to CLIENT immediately after each survey has been completed.

7.2.

Sectioning


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17 of 19

5083E

BASIC DESIGN

5083E-1-FFX-D-2500-M4DETN-0001

Rev.

B

Sectioning is not permitted on tank welds. Spot radiography shall be used in lieu of sectioning. 7.3.

Cleaning In addition to the general cleaning requirements of API Standard 650, thoroughly broom sweep or wash clean inside of each tank. Remove all weld slag, loose scale, oil, dirt, sand, debris, and rubbish. For austenitic stainless steel tanks, the following cleaning, painting and marking requirements shall apply:

7.4.

l

Only stainless steel brushes, clean iron free sand, ceramic or stainless steel grit shall be used for cleaning alloy surfaces.

l

Solvents used to clean or remove scale or oil shall be free of organic and inorganic chlorides.

l

Do not use marking inks, crayons, or paint that contain sulphur, chloride, carbon, or harmful metal or metal salts such as zinc, lead, or copper which may cause corrosive attack when the vessel part is heated.

Testing Tanks shall be tested in accordance with API Standard 650. Each compartment of pontoon roofs shall be individually tested with air at a pressure of 3 inches of water gauge. A soapy water mixture, linseed oil or equivalent shall be applied to all welded joints under pressure. Prior to pressure testing the floating roof drain system, the pipe or hose system shall be thoroughly flushed to ensure the removal of any internal obstruction. For open top, fixed roof and open floating roof tanks, the water filling height shall be to the top of top angle. The floating roof must return into the tank without damage to seal or weather shield when the water level is lowered. Any tank showing evidence of leakage from the bottom during test must be emptied immediately. The source of leakage must be determined and the defect repaired prior to refilling. Austenitic stainless steel and austenitic stainless steel lined tank shall be hydrostatically tested with clean filtered high purity water containing less than 50 ppm chlorides, unless stated otherwise on the tank outline drawing. As an alternative, tanks that can be completely rinsed may be hydrostatically tested with clean filtered chlorinated potable water followed by immediate


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18 of 19

5083E

BASIC DESIGN

5083E-1-FFX-D-2500-M4DETN-0001

Rev.

B

draining and rinsing with high purity water containing less then 50 ppm chlorides. The test water chemistry and rinsing procedure shall be submitted for review and approval by CLIENT before this alternative is used. Settlement observations shall be made and recorded by Vendor during the water test program in order to control the rate of filing, to prevent overstress of fine grained solid, and to confirm whether or not the tank can be commissioned for its design duty. Test shall be terminated if any excessive settlement is observed, and shall be resumed only by permission of CLIENT. Tank shall be completely drained and thoroughly dried within 48 hours of testing. Acceptable methods of drying include mopping, wiping, or blow drying with cool air or nitrogen less than 140 F. Vendor shall submit a cleaning and drying procedure for CLIENT approval prior to filling the tank for hydrostatic testing. When tank is subject to an extended hydrostatic test or wet lay up condition (greater than 48 hours) the test water shall be checked, and if necessary treated, on a daily basis with a biocide to minimize the risk of zone microbiological contamination. An acceptable biocide is ozone (0.1 ppm residual). Any other biocides shall be reviewed and approved by CLIENT. After drying, tank shall be sealed air-tight and maintained in a clean dry condition. 8.

DATA SHEET CERTIFICATION Upon completion of construction, the Vendor shall furnish CLIENT with copies of a Data Sheet according to Appendix L of API Standard 650, that reflects the as-built conditions and certifies that the tank conform with the requirements of API Standard 650 and the additional requirements of this specification and other CLIENT Specifications referred to.

9.

GROUNDING SYSTEM The Contractor shall let prevision to connect the cable grounding. It will consist in a steel plate of dimension 10x10x5 cm provided with a hole of diameter 7/16 ,. Each tank shall provide four steel plates to be connected to ground.

10.

VENDOR *S GUARANTEE


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5083E

BASIC DESIGN

5083E-1-FFX-D-2500-M4DETN-0001

Rev.

B

VENDOR shall guarantee the mechanical design of the equipment when operating at the design conditions. This guarantee covers any fabrication defect or any problem due to improper mechanical design including vibration damage. VENDOR shall guarantee all equipment to be free from defects in workmanship and/or material and shall agree to repair or replace at his own expense any part proving defective within the period of time as specified on the commercial contract.


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FF-178-12-2211-S004 Tank specification_B.pdf

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