jerms-d-3205 manufacture of atmospheric tanks
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JERMS-D-3205
Manufacture of
Atmospheric Tanks
Revision
2
Responsibility
JER Engineering Division
4 November
2008
Jubail Export Refinery
Material Specifications
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Jubail Export Refinery
Material Specifications
JERMS-D-3205
Rev-2Manufacture of Atmospheric Tanks 4 November 2008
This document is the property of Jubail Export Refinery and no parts of this document shall be reproduced by
any means without prior approval by the Company.
Page 2 of 39
Revision Tracking
Revision Revision Date Scope of Revision
2 4 November 2008Revised to update paragraphs: 3.1, 13.1.1, 8.3.2, 14.1.Adding references: JERES-H-001, JERES-H-002 & JERES-H-005
1A 2 October 2008 Revised to update par. 3.1, 8.6.8.2; Par. 10.1.2 and 13.1.1 and 14.3
0 29 April 2008 Issued for bid package.
03 14 April 2008 For adjusting formatting
02 31 March 2008 Issued for bid package. Only for Review
01 03 August 2007 The first official JERMS-D-3205 is issued
0008 February2007
First draft issued is based on Saudi Aramco 32-SAMSS-005Manufacture of Atmospheric Tanks issue date 31 December, 2003.
Document was modified to incorporate amendments and modifications.
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Jubail Export Refinery
Material Specifications
JERMS-D-3205
Rev-2Manufacture of Atmospheric Tanks 4 November 2008
This document is the property of Jubail Export Refinery and no parts of this document shall be reproduced by
any means without prior approval by the Company.
Page 3 of 39
Table of Contents
Section Contents Page
1 Scope 5
2 Conflicts, Deviations and Clarifications 5
3 References 5
4 Definitions 7
5 Introduction Note 8
6 (1) Scope 8
7 Materials 9
8 Design 10
9 Fabrication 17
10 Erection 17
11 Methods of Inspecting Joints 22
12 Welding Procedure and Welder Qualifications 23
13 Marking 23
14 Coatings and Painting 24
15 Documentation 24
16 Disinfection 24
Appendixes
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Jubail Export Refinery
Material Specifications
JERMS-D-3205
Rev-2Manufacture of Atmospheric Tanks 4 November 2008
This document is the property of Jubail Export Refinery and no parts of this document shall be reproduced by
any means without prior approval by the Company.
Page 4 of 39
B Recommendations for Design and Construction of Foundationfor Aboveground oil Storage Tanks
26
C External Floating Roofs 27
G Structurally Supported Aluminum Dome Roofs 31
H Internal Floating Roofs 33
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Jubail Export Refinery
Material Specifications
JERMS-D-3205
Rev-2Manufacture of Atmospheric Tanks 4 November 2008
This document is the property of Jubail Export Refinery and no parts of this document shall be reproduced by
any means without prior approval by the Company.
Page 5 of 39
1 Scope
This standard covers the minimum mandatory requirements that shall be used as the
basis for developing detailed design and construction of foundations for storagetanks.
2 Conflicts, Deviations and Clarifications
2.1 Any conflicts between this standard and other applicable Company EngineeringStandards (JERES), Material Specifications (JERMS), Standard Drawings (JERSD),
Engineering Procedures (JEREP), Company Forms or Industry standards,
specifications, Codes and forms shall be brought to the attention of CompanyRepresentative by the Contractor for resolution.
Until the resolution is officially made by the Company Representative, the most
stringent requirement shall govern.
2.2 Where a licensor specification is more stringent than those of this standard, the
Licensors specific requirement shall apply.
2.3 Where applicable Codes or Standards are not called by this standard or its
requirements are not clear, it shall be brought to attention of CompanyRepresentative by Contractor for resolution.
2.4 Direct all requests for deviations or clarifications in writing to the Company or itsRepresentative who shall follow internal Company procedure and provide final
resolution.
3 References
The selection of material and equipment, and the design, construction, maintenance,
and repair of equipment and facilities covered by this standard shall comply with thelatest editionof the references listed below as of the CUT-OFF DATE as specified
in the Contract unless otherwise noted.
3.1 Company References
Company Engineering Standards
JERES-A-007 Hydrostatic Testing Fluids and Lay-Up Procedures
JERES-A-112 Meteorological and Seismic Design Data
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Jubail Export Refinery
Material Specifications
JERMS-D-3205
Rev-2Manufacture of Atmospheric Tanks 4 November 2008
This document is the property of Jubail Export Refinery and no parts of this document shall be reproduced by
any means without prior approval by the Company.
Page 6 of 39
JERES-A-206 Positive Material IdentificationJERES-B-017 Fire Water System Design
JERES-B-018 Air Foam Systems for Storage Tanks
JERES-H-001 Coating Selection & Application Requirements for Industrial
Plants & Equipment.
JERES-H-002 External Coatings for Buried Steel Piping and Pipelines
JERES-H-005 Internal Coating for Vessels, Tanks and Equipment
JERES-J-300 Level
JERES-J-600 Pressure Relief DevicesJERES-W-017 Welding Requirements for API Tanks
Company Materials Specifications
JERMS-G-3217 Side-Entry Mixers
JERMS-H-9107 Qualification Requirements and Application of Composite
Fluropolymer/Ceramic Coatings to Fasteners
JERMS-J-4319 Radar Tank Gauging Equipment
Company Standard Drawings
JERSD-D-0001 Manholes and Vents for Tanks
JERSD-D-0002 Roof Center Vent for Cone-Roof Tanks
JERSD-D-0003 Radar, Temperature and Manual Gauging Assembly for
Floating Roof Tanks
JERSD-X-0013 Half Shell Bracelet Type Anode for Pipe Sizes 4-60 Inch
JERSD-P-0003 Tank Grounding
JERSD-D-0004 General Assembly of Gauge well for External Floating Roof
Tanks
Company Inspection Requirements
JERITP-D-324900 Tanks: Atmospheric, Steel within the Scope ofJERMS-D-3205
Company Forms and Data Sheets
Form NMR-7918-1 Nonmaterial Requirements for Tanks
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Jubail Export Refinery
Material Specifications
JERMS-D-3205
Rev-2Manufacture of Atmospheric Tanks 4 November 2008
This document is the property of Jubail Export Refinery and no parts of this document shall be reproduced by
any means without prior approval by the Company.
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Form NMR-7918-2 Nonmaterial Requirements for Floating and Internal FloatingRoofs
3.2 Industry Codes and Standards
American Petroleum Institute
API STD 650 Welded Steel Tanks for Oil Storage
API STD 2000 Venting Atmospheric and Low-Pressure Storage Tanks
API RP 2003 Protection Against Ignitions Arising Out of Static, lightning,
and Stray Currents
American Society of Mechanical Engineers (Boiler and Pressure Vessel Code)
ASME B16.11 Forged Fittings, Socket-Welding and Threaded
ASME SEC V Nondestructive Examination
National Fire Protection Association
NFPA 68 Guide for Venting of Deflagration
NFPA 255 Standard Method of Test of Surface Burning Characteristics of
Building Materials
American Water Works Association
AWWA C652 Disinfection of Water Storage Facilities
4 Definitions
4.1 Definitions presented in this Standard and other JER documents have precedence
over other definitions. Conflicts between various definitions shall be brought to theattention of Company Representative by the Contractor for resolution.
Company: Jubail Export Refinery.
Company Representative: A designated person from the Company or an assignedthird party representative.
Company Inspector:A designated person or an agency responsible for conducting
inspection activities on behalf of the Company.
4.2 List of Definitions
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JERMS-D-3205
Rev-2Manufacture of Atmospheric Tanks 4 November 2008
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Page 8 of 39
Design Engineer: The Engineering Company responsible for specifying the designrequirements on the Storage Tank Data Sheet.
Design Metal Temperature: The lowest of the following temperature values:
1) The lowest one-day mean atmospheric temperature (LODMAT) per JERES-A-
112, or
2) The minimum operating temperature, or
3) The hydrostatic test temperature
Tank Manufacturer: The Company responsible for the design and fabrication of
tanks.
5 Introduction Note
The API STD 650, Third Edition, September 2003, is part of this specification. The
text in each paragraph below is an addition, deletion or exception to API STD 650 as
noted in parenthesis. Paragraph numbers not appearing in API STD 650 are newlyadded paragraphs inserted in numerical order. For these new paragraphs there is no
addition, deletion or exception wordings in parenthesis.
The API STD paragraph numbers are indicated in parenthesis.
Only the paragraphs of the API STD 650 that have been modified (by addition,
deletion or exception) by this standard are mentioned. The other API STD 650
paragraphs that are not mentioned in this standard remain applicable.
6 (1) Scope
6.1 (1.1) General
6.1.2 (1.1.6) Appendix B and all other pertinent requirements of this specification shall be
used as the basis for developing detailed design and construction of foundations forstorage tanks.
6.1.3 (1.1.7) Additional requirements for external floating roofs are contained in
Appendix C of this specification.
6.1.4 (1.1.11) Additional requirements for optional self-supporting aluminum dome
roofs are contained in Appendix G of this specification.
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Jubail Export Refinery
Material Specifications
JERMS-D-3205
Rev-2Manufacture of Atmospheric Tanks 4 November 2008
This document is the property of Jubail Export Refinery and no parts of this document shall be reproduced by
any means without prior approval by the Company.
Page 9 of 39
6.1.5 (1.1.12) Additional requirements for internal floating roofs are contained inAppendix H of this specification.
6.1.6 (1.1.23) This specification shall be attached to and form an integral part of a
purchase order.
6.2 (1.3 )Compliance
6.2.1 (1.3.1) Any conflicts between this standard and other applicable Company
Engineering Standards (JERESs), Materials Specifications (JERMSs), StandardDrawings (JERSDs), or industry standards, codes, and forms shall be resolved in
writing by the Company Engineering Manager.
Until the resolution is officially made by the Company Engineering Manager, themost stringent requirement shall govern.
Direct all requests to deviate from this standard in writing to the Company
Representative, who shall follow internal Company procedure.
6.2.2 (1.3.2) Direct all requests to deviate from this specification in writing to the
Company Representative.
6.2.3 (1.4)Referenced Publications
Materials or equipment supplied to this specification shall comply with the latest
edition of the references listed below and those referenced in API 650, unless
otherwise noted.
7 (2) Materials
7.1 (2.1) General
7.1.1 (2.1.1) The Tank Manufacturer shall submit a complete material specification
with the proposal.
The Tank Manufacturer may propose the use of alternative materials to those that arelisted in API STD 650. The alternative materials shall comply with all the other
requirements of API STD 650 and this specification. The chemical compositions
and mechanical properties of non-ASTM materials shall be submitted to theCompany Representative for approval.
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Rev-2Manufacture of Atmospheric Tanks 4 November 2008
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Materials proposed by the Tank Manufacturer that are equivalent to those specifiedin API STD 650 shall be approved by the Company Representative.
7.1.2 (2.1.2) Exception
All materials shall be clearly identified and provided with mill test certificates.
Materials shall be alloy-verified by the Tank Manufacturer in accordance with
JERES-A-206.
7.1.3 (2.2) Plates
7.1.4 (2.2.1) General
7.1.5 (2.2.1.5) Annular plate material shall be of the same material group per API STD650 as the lowest shell course.
7.1.6 (2.2.1.6) Rimmed and capped steels shall not be used for shell, bottom and roof
plates.
7.1.7 (2.2.9.3) Exception
The design metal temperature as defined in paragraph 1.5 of this specification shall
be used as the basis for impact test exemption of Figure 3.1 of API STD 650.
7.2 (2.7) Bolting
Flange bolting material shall conform to A193 Grade B7 bolts with A194 Grade 2H
nuts. All bolting shall be coated with a fluoropolymer/ceramic coating in accordance
with JERMS-H-9107.
7.3 (2.9) Gaskets
Gasket materials shall be non-asbestos.
8 (3) Design
8.1 (3.1) Joints
8.1.1 (3.1.3) Restrictions on Joints
8.1.2 (3.1.3.5) Lap-welded joints shall be lapped at least five times the nominal
thickness of the thinner plate joined; however, with double-welded lap joints, the lap
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JERMS-D-3205
Rev-2Manufacture of Atmospheric Tanks 4 November 2008
This document is the property of Jubail Export Refinery and no parts of this document shall be reproduced by
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need not exceed 50 mm (2 in.), and with single-welded lap joints, the lap shall not beless than 25 mm (1 in.).
8.1.3 (3.1.5) Typical Joints
8.1.4 (3.1.5.3a) Exception
Top angles shall be attached to the shell by butt welds with complete penetration and
complete fusion.
8.2 (3.2) Design Considerations
8.2.1 (3.2.6) Information provided by the Design Engineer on the API STD 650Storage Tank Data Sheet and a completed Company Form 2696-ENG shall be usedfor the tank design in accordance with API STD 650 and this specification.
8.2.2 (3.2.7) Nozzle Loads
8.2.3 (3.2.7.1) Associated piping systems loads shall be specified on the tank data sheet.
8.2.4 (3.2.7.2) Tank Manufacturer shall ensure that stresses at nozzle-to-tank
connections, due to piping loads specified on the tank data sheet, are within the
allowable limits.
8.3 (3.3) Special Considerations
8.3.1 (3.3.4) Weld Hardness
Weld hardness testing requirements and acceptance criteria shall be in accordance
with JERES-W-017.
8.3.2 (3.3.5) A foundation drip ring shall be provided in order to prevent the ingress
of rainwater or condensation between the tank bottom and foundation. The ring shallmeet the following requirements.
1) Material shall be carbon steel, 3.2 mm (1/8 inch) thick.
2) Continuously seal welded to the edge of the tank bottom or annular plate. All
radial joints between the drip ring sections shall also be seal welded.
3) Extend at least 75 mm (3 inch) beyond the outer periphery of the concrete ring
wall.
4) Turn down at its outer diameter at a 45-degree angle.
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Page 12 of 39
5) The top of the drip ring and a 75 mm (3 inch) height of the tank shell shall bepainted with a 250-300 microns (10-12 mils) thick epoxy coating in accordance
with JERES-H-001.
8.3.3 (3.3.6) Under-tank leak detection and sub-grade protection
8.3.4 (3.3.6.1) Tanks in services other than water shall be provided with under tank leakdetection and sub-grade protection according to API STD 650, Appendix I.
Acceptable construction details are Figures I-1, I-2, I-3, I-6, I-7, I-8, I-9 and I-10.
8.3.5 (3.3.6.2) Flexible membrane leak-barrier (liner) of minimum 1000 microns (40
mils) thickness compatible with the stored product shall be specified under the tankbottom. The liner shall be placed in accordance with JERSD-X-0013, extending to
the internal top edge of the ring foundation.
8.3.6 (3.3.6.3) Joints in the liner shall satisfy the leak tightness, permeability and
chemical resistance requirements for the liner material.
8.3.7 (3.3.6.4) Alternative under-tank leak detection and sub-grade protection systems
shall not be permitted without the prior approval of the Company Representative.
8.3.8 (3.3.7) Reinforcing pads and all other external attachment pads shall haverounded corners of minimum 50 mm (2 inch) radius. Pads that cover shell seams
shall be provided with a 6 mm telltale hole.
8.4 (3.4) Bottom Plates
8.4.1 (3.4.4) Tank bottom shall be sloped in accordance with the specification
provided on the Storage Tank Data Sheet.
8.4.2 (3.4.5) Bearing plates shall be provided under all fixed roof support columns.
The bearing plates shall be twice the diameter of the column section with a minimum
356 mm diameter (14 inch), 12.7 mm (1/2 inch) thick, and shall be attached to thebottom by 4.8 mm (3/16 inch) continuous fillet welds.
8.5 (3.6) Shell Design
8.5.1 (3.6.5) Design methods other than the one-foot method and the variable-design-point method provided in API STD 650 shall be approved by the Company
Representative.
8.5.2 (3.7) Shell Openings
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Rev-2Manufacture of Atmospheric Tanks 4 November 2008
This document is the property of Jubail Export Refinery and no parts of this document shall be reproduced by
any means without prior approval by the Company.
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8.5.3 (3.7.1) General
8.5.3 (3.7.1.10) Number, size, type, and orientation of nozzles and manways shall be in
accordance with JERSD-D-0001and as specified on the Storage Tank Data Sheet.
8.5.4 (3.7.6) Shell Nozzles and Flanges
8.5.4 (3.7.6.4) All shell nozzles shall be the API Low Type, unless otherwise specified.
8.6 (3.8) Shell Attachments and Tank Appurtenances
8.6.1 (3.8.2) Bottom Connections
When specified, bottom connections shall be designed in accordance with API STD650, Appendix O.
Connections shall be fabricated from elbows; miter joints are prohibited.
Vortex breakers shall be provided for bottom connections.
8.6.2 (3.8.5) Roof Nozzles
8.6.3 (3.8.5.3) All open vents shall be protected by bird screens, except those in asphalt
service.
8.6.7 (3.8.9) Threaded Connections
Threaded and socket welded connections shall be in accordance with ASME B16.11.
8.6.8 (3.8.10) Platforms, Walkways, and Stairways
8.6.8.1 (3.8.10.1) Type and location of stairway shall be as specified on the Storage TankData Sheet and Company Form 2696-ENG.
8.6.8.2 (3.8.10.2) Gauger's platform in accordance with JERSD-D-0006 shall be provided
for external floating roof tanks.
8.6.8.3 (3.8.10.3) Stairs and platforms shall be fabricated of open grating. Checker-plate
grating is not permitted.
8.6.8.4 (3.8.10.4) Walkways shall be fabricated of diamond-pattern (checker-plate) grating
with anti-skid paint.
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8.6.8.5 (3.8.10.5) Stairways on insulated tanks shall be provided with stringers on bothsides.
8.6.9 (3.8.11) Floating Suction Lines
8.6.9.1 (3.8.11.1) Floating suction lines shall be provided, when specified on the Storage
Tank Data Sheet.
8.6.9.2 (3.8.11.2) Floating suction lines using rigid pipe shall be designed to prevent them
from being raised past the vertical axis.
8.6.9.3 (3.8.11.3) Floating suction lines using articulated pipe shall be designed so that the
tip of the suction line is always on the axial centerline of the tank throughout its totaltravel.
8.6.10 (3.8.12) Inlet Diffusers
8.6.10.1 (3.8.12.1) An inlet diffuser shall be provided for tanks with internal floating roofs.
The inlet diffuser shall be sized based on the maximum pumping in rate and themaximum permissible exit velocity through the slots in the diffuser.
8.6.10.2 (3.8.12.2) The diffuser shall be slotted. The slots shall be located at 60 degrees (2
o'clock and 10 o'clock positions) from the vertical centerline of the diffuser.
8.6.10.3 (3.8.12.3) Number and dimensions of slots shall be calculated so that the exit
velocity does not exceed 1 m/sec (3.28 ft/sec) at the maximum inlet flow until there
is a minimum of 1m of liquid cover over the inlet.
8.6.11 (3.8.13) Mixers
8.6.11.1 (3.8.13.1) Number and type of mixers shall be as specified on the Storage Tank
Data Sheet.
8.6.11.2 (3.8.13.2) Side-entry propeller mixers shall be designed, inspected, and tested inaccordance with JERMS-G-3217.
8.6.11.3 (3.8.13.3) Nozzles for side-entry mixers shall be designed in accordance with APISTD 650 for manways. Supports for the mixer may be needed to maintain stresses at
the nozzle-to-shell junction within the allowable limits.
8.6.11.4 (3.8.13.4) Jet-nozzle mixers shall not be used in tanks with internal floating roofs
on floats.
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8.6.12 (3.8.14) Foam and Water Systems
Fire or cooling water and foam systems shall be provided in accordance with JERES-
B-017and JERES-B-018, respectively, when specified on the Storage Tank Data
Sheet.
8.6.13 (3.8.15) Gauging
8.6.13.1 (3.8.15.1) External-floating roofs shall be provided with a radar gage assembly in
accordance with JERSD-D-0003and JERES-J-300.
8.6.13.2 (3.8.15.2) External floating roof tanks shall be provided with a radar liquid level
gauge in accordance with JERMS-J-4319, located adjacent to the gauger's platform.The top of the gauge piping shall be located from 150 mm (6 inch) to 300 mm (12inch) above the platform handrail and approximately 150 mm (6 inch) horizontally
from the gauger's platform for easy maintenance access.
8.6.13.3 (3.8.15.3) Fixed-roof tanks shall be provided with a radar gauge assembly.
8.6.14 (3.8.16) Grounding
8.6.14.1 (3.8.16.1) Tanks in hydrocarbon services shall be provided with grounding lugs in
accordance with JERSD-P-0003at a minimum of four points spaced equidistantly
around the base of the tank.
8.6.14.2 (3.8.16.2) The design of bonding shunts between the tank shell and the roof shall
be in accordance with JERSD-P-0003and API RP 2003 requirements.
8.7 (3.9) Top and Intermediate Wind Girders
8.7.1 (3.9.4) Stiffening Rings as Walkways
Top wind girders, when specified as walkways, shall be located 1067 mm (42 inch)
from the top of the tank.
8.7.2 (3.9.7) Intermediate Wind Girders
8.7.2.1 (3.9.7.1) The minimum required thickness for the design condition, excluding
corrosion allowance, shall be used to calculate the maximum height of unstiffenedshell.
8.8 (3.10) Roofs
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8.8.1 (3.10.2) General
8.8.1.1 (3.10.2.1) Type of roof shall be as specified on the Storage Tank Data Sheet.
8.8.1.2 (3.10.2.9) When an internal coating is specified for a fixed roof, a self-supported
roof shall be used, and the roof lap joints shall be continuously welded on both sides.
For internal tank walls, surface preparation, painting, and coating specifications shall
be selected in accordance with JERES-H-005.
8.8.2 (3.10.4) Supported Cone Roofs
8.8.2.1 (3.10.4.6) Exception
Only welded joints are permitted for all structural attachments in the roof supporting
system other than the following joints:
a) Rafter clips for the outer row to the tank shell.
b) Column-base clip guides to the tank bottom.
8.8.3 (3.10.5) Self-Supporting Cone Roofs
Only welded joints are permitted for all structural attachments in the roof supportingsystem.
8.8.4 (3.10.6) Self-Supporting Dome and Umbrella Roofs
Only welded joints are permitted for all structural attachments roofs' supportingsystems in self-supporting roofs, except for self-supporting aluminum dome roofs.
8.8.5 (3.10.8) Tank Venting
8.8.5.1 (3.10.8.1) Exception
Fixed roof tanks with internal floating roofs shall be treated as fixed roof tanks when
determining their venting requirements.
Commentary Note:
When circulation vents are not installed in fixed roof tanks with an internal floating roof,
individual designated venting devices/arrangement shall be provided for the fixed roof and
the internal floating roof according to venting requirements of API STD 2000 and this
specification.
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Rev-2Manufacture of Atmospheric Tanks 4 November 2008
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8.8.5.2 (3.10.8.3) Exception
Emergency venting capacity per API STD 2000 and explosion hatch per NFPA 68
shall be provided for API STD 650 fixed roof tanks. A frangible shell-to-roof joint
may be considered as an alternative to additional venting devices that are normally
provided to relieve excess pressure during emergency conditions for tanks of
diameters equal to or larger than 50 feet. Frangible shell-to-roof joint shall conform
to the requirements of API STD 650.
8.8.5.3 (3.10.8.4) Venting requirements shall be specified in accordance with API STD
2000, JERES-J-600, JERSD-D-0001and JERSD-D-0002and the requirements ofthis specification.
9 (4) Fabrication
9.1 (4.1) General
9.1.1 (4.1.1) Workmanship
9.1.1.1 (4.1.1.3) All flange bolt holes shall straddle the axial centerline of the tank.
9.1.2 (4.1.4) Marking
9.1.2.1 (4.1.4.1) Marking shall be done with water soluble materials containing nosubstances that would attack or harmfully affect the tank at both ambient and
operating temperature.
9.1.2.2 (4.1.4.2) Marking materials shall be free of lead, sulfur, zinc, cadmium, mercury,
chlorine or any other halogens.
9.1.3 (4.1.5) Shipping
All flange faces and other machined surfaces shall be greased and properly protected
for shipping.
9.2 (4.2 )Shop Inspection
9.2.1 (4.2.3) Company Inspector shall have the right to inspect the fabrication at anystate and to reject material or workmanship, which does not conform to the specified
requirements.
10 (5) Erection
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10.1 (5.1) General
10.1.1 (5.1.1) The Tank Manufacturer shall check to ensure that the dimensional
tolerances of the tank foundation are satisfactory prior to start of erection.
10.1.2 (5.1.6) The bottom side of the bottom plates shall be cleaned of all foreign
matter and grit-blast cleaned prior to being coated and placed in position for welding.The topside surface of bottom plates, regardless whether coating is required or not,
shall also be grit-blast cleaned prior to welding. Surface preparation shall be
according Mfrs datasheet recommendation.
10.2 (5.2 )Details of Welding
10.2.1 (5.2.1) General
10.2.1.1 (5.2.1.11) Documentation that details the welding sequences for the tank shall beprovided to Company prior to the start of field erection.
10.2.1.2 (5.2.1.12) All structural attachment welds to the tank shell, bottom, roof, andappurtenances shall be continuously seal welded.
10.2.1.3 (5.2.1.13) All welds shall be free from coarse ripples, undercuts, grooves, overlaps,
abrupt ridges and valleys to avoid stress concentration points and interference with
interpretation of NDT results.
10.2.2 (5.2.2) Bottoms
10.2.2.1 (5.2.2.4) Weld crowns of the bottom annular plate joints shall be ground flush at
the contact areas with the first shell course.
10.2.3 (5.2.4) Shell-to-Bottom Welds
Exceptions
a) Perform oil-penetrate leak test on the entire length of the first weld pass by applying
high flash point penetrant oil such as light diesel oil for a minimum 4 hours(preferably overnight).
b) Perform oil-penetrate leak test on the entire length of the first completed weld, before
welding the second fillet weld, by applying high flash point penetrant oil such as light
diesel oil for a minimum 4 hours (preferably overnight). Alternatively, apply a vacuum
test at 35 kPa gauge (5 psig), using a vacuum box fit to the shell-to-bottom junction.
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c) The inside fillet welds of the shell-to-bottom joint in a cylindrical flat-bottom tankshall be examined by either the dye-penetrant or wet-fluorescent magnetic particle
method before hydrotest.
10.2.4 (5.2.5) Roofs
10.2.4.1 (5.2.5.1) Internal floating roofs shall be installed in accordance with the
instructions provided by the internal floating roof manufacturer.
10.2.4.2 (5.2.5.2) Prior to the installation of fixed roof plates, roof 's column supports shall
be inspected for plumbness. Roof support columns with out-of-plumbness exceeding1/200 of the total tank shell height shall be realigned.
10.2.4.3 (5.2.5.3) All internal clips, lugs, brackets etc. that are used temporarily for
construction purposes shall be removed from the roof supporting columns and shell
plates and ground flush and smooth prior to roof installation.
10.3 (5.3 )Inspection, Testing, and Repairs
10.3.1 (5.3.1) General
10.3.1.1 (5.3.1.1) Inspection shall be in accordance with Company Inspection Requirement
JERITP-324900, JERES-W-017and the following additional requirements.
10.3.1.2 (5.3.1.5) All required Nondestructive Examination shall be performed in
accordance with inspection procedures that are in complete compliance with ASMESEC V and this specification. This written procedure shall address each inspection
method and technique used including acceptance criteria. When required by the
purchase order the procedure(s) shall be submitted to Company Inspection
Department for approval.
10.3.1.3 (5.3.1.6) All Nondestructive Examination, including Magnetic Particle and LiquidPenetrant examinations, shall be performed by personnel certified or equivalent
National Certification Programs that has been approved by the Company Inspector.
Personnel responsible for interpretation of Nondestructive Examination results shall
be certified to a minimum of Level II.
10.3.1.4 (5.3.1.7) Prior to final inspection and pressure testing, the inside and outside ofthe tank shall be thoroughly cleaned of all slag, scale, dirt, grit, weld spatter, paint,
oil, etc.
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10.3.1.5 (5.3.1.8) Company Inspector may reject the use of any materials, equipment, ortools that do not conform to the specification requirements, jeopardize the safety of
personnel, or impose hazard or damage to Company property.
10.3.1.6 (5.3.1.9) Testing shall be in accordance with Company Inspection RequirementsForm 175-324900 and the following additional requirements.
10.3.2 (5.3.3) Inspection of Tank Bottom Welds
Exception
Only vacuum box test method is permitted.
10.3.3 (5.3.5) Testing of the Shell
10.3.3.1 (5.3.5.1) Tanks shall be hydrostatically tested by filling it with water of quality inaccordance with JERES-A-007as follows:
1) to the maximum design liquid level, H specified in API STD 650,
2) for a fixed roof tank , to 50 mm (2 in.) above the weld connecting the roof plate
or compression bar to the top angle or shell; or
3) to a level lower than that specified in items (a) or (b) when restricted by
overflow, an internal floating roof, or other freeboard.
10.3.3.2 (5.3.5.2) Hydrostatic testing duration shall be minimum 24 hours. The water-filling rate shall not exceed the rate shown in the following table:
Water Filling Rate Table
Bottom Course Thickness Tank Portion Filling Rate
Less than 22 mmTop course 300 mm/hour
Below top course 450 mm/hour
22 mm and more
Top third of tank 225 mm/hour
Middle third of tank 300 mm/hour
Bottom third of tank 450 mm/hour
10.3.3.3 (5.3.5.3) Testing of the shell by a method other than hydrotesting such as painting
with highly penetrating oil, applying vacuum or a combination of both methods isnot permitted.
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10.3.3.4 (5.3.5.4) Floating roof seals, either primary or secondary, shall be completelycontained within the shell when the test water level reaches the test liquid level.
10.3.3.5 (5.3.5.5) The Tank Manufacturer shall furnish all test materials and facilities,
including blinds, bolting, and gaskets.
10.3.3.6 (5.3.5.6) The tank shall be completely drained and thoroughly dried immediatelyafter completion of the hydrostatic test. If sea water or raw water is used for
hydrostatic testing of tanks in other than these services, the tank shall be thoroughly
washed with fresh water immediately after draining.
10.3.3.7 (5.3.5.7) The Tank Manufacturer's plan for disposal of hydrotest water shall beevaluated by the engineering contractor.
10.3.4 (5.3.6) Testing of the Roof
10.3.4.1 (5.3.6.1) Exception
All roof weld joints of a tank designed to be gas tight, such as a tank with peripheral
circulation vents or a tank with free or open vents, shall be vacuum box tested.
Applying internal pressure for the detection of leaks is not permitted. External
floating roof testing shall be in accordance with Appendix C of this specification.
Internal floating roof testing shall be in accordance with Appendix H of this
specification.
10.3.5 (5.3.8) Magnetic Particle or Liquid Penetrant Examination
The dye penetrant or magnetic particle method before the hydrostatic test.
10.4 (5.4 )Repairs to Welds
10.4.1 (5.4.5) Repairs to welds shall be in accordance with JERES-W-017.
10.5 (5.6 )Tank Settlement Measurements
10.5.1 (5.6.1) The base elevation shall be established and recorded at equidistantlocations around the tank circumference in multiples of four, but not to exceed 10 m(32.8 foot) between each reference point and no less than eight (8) locations. The
measurement points shall be at well marked locations on the bottom projection
outside the tank or on clips welded to the shell. Elevation readings shall be taken asfollows:
1) Before hydrostatic testing has started.
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Page 22 of 39
2) At the filled point.3) At the filled point.
4) After 24 hours from filling the tank at the maximum water fill height.
5) After the tank has been emptied of test water.
10.5.2 (5.6.2) Any differential settlement greater than 1.5 mm (60 mils) per meter of
circumference, or a uniform settlement in excess of 50 mm (2 inch), shall bereviewed by the Company Representative. Filling shall be stopped until clearance to
continue has been received from the Company Representative.
10.5.3 (5.6.3) For tanks 15.24 m (50 foot) diameter and larger, internal bottomelevation measurements shall be made before and after the hydrostatic test. These
measurements shall be made at 3 m intervals along diametric lines across the bottom.
The diametric lines shall be spaced approximately 10 m (32.8 foot) apart at the tank
shell.
11 (6) Methods of Inspecting Joints
11.1 (6.1) Radiographic Method
11.1.1 (6.1.1) Application
Exception
Radiographic inspection is required for the weld joining the top angle to the shell.
11.1.2 (6.1.2) Number and Location of Radiographs
11.1.2.1 (6.1.2.4) Exception
This requirement is permitted only if a group of tanks are erected by the same tank
manufacturer.
11.1.3 (6.1.5) Radiographic Standards
Tungsten inclusions in gas tungsten arc welds shall be evaluated as individualrounded indications. Clustered or aligned tungsten inclusions shall be removed and
repaired.
11.1.4 (6.1.6) Determination of Limits of Defective Welding
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The additional spots to be radiographed shall be specified by the Company Inspectorin accordance with JERES-W-017.
11.2 (6.2 )Magnetic Particle Examination
11.2.1 (6.2.5) Magnetic Particle Examination shall be according to JERES-W-017.
11.3 (6.5) Visual Inspection
Welds shall be visually inspected for any defects prior to performing nondestructive
examination (radiography, magnetic particle, liquid penetrant, ultrasonic). Visual
inspection shall not replace any required nondestructive examination.
11.4 (6.6) Vacuum Testing
11.4.1 (6.6.3) Exception
A partial vacuum of 70 kPa gauge (10 psig) shall be used for the test.
11.4.2 (6.6.11) Delete this paragraph.
12 (7) Welding Procedure and Welder Qualifications
12.1 (7.2) Qualification of Welding Procedures
12.1.1 (7.2.1) General Requirements
12.1.1.1 (7.2.1.1) All welding procedures and procedure qualifications shall be in
accordance with JERES-W-017and be submitted for review by Company
13 (8) Marking
13.1 (8.1) Nameplates
13.1.1 (8.1.5) All tanks with internal coatings shall have the Approved Protective
Coating Systems specification number marked on the nameplate. For internal tankwalls, surface preparation, painting, and coating specifications shall be selected in
accordance with JERES-H-005.
For buried external section of tank walls, surface preparation, painting, and coating
specifications shall be selected in accordance with JERES-H-002.
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13.2 (8.4) Tank number and content shall be painted in both Arabic and English at90 degree intervals around the tank.
13.3 (8.5) Marking shall be done with water soluble materials containing no
substances that would attack or harmfully affect the tank at both ambient andoperating temperature.
13.4 (8.6) Marking materials shall be free of lead, sulfur, zinc, cadmium, mercury,
chlorine, or any other halogens
14 (9) Coatings and Painting
14.1 (9.1) Type of coating and painting systems to be applied shall be as specified
on the Storage Tank data Sheet.
For external tank walls, surface preparation, painting, and coating specifications shall
be selected in accordance with JERES-H-001.
For internal tank walls, surface preparation, painting, and coating specifications shall
be selected in accordance with JERES-H-005.
For buried external section of tank walls, surface preparation, painting, and coatingspecifications shall be selected in accordance with JERES-H-002.
14.2 (9.2) Surfaces to be coated shall be cleaned and prepared prior to its coating in
accordance with the applicable coating and painting systems.
14.3 (9.3) Tank placed directly on soil sub-grade shall be coated with Coal tar
Epoxy paint, 600thick or Epoxy coating for Atmospheric service, 450thick, asapplicable, on its soil side leaving minimum 2.5 cm (1 inch) wide strip of uncoated
steel along the underside of the floor plate, centered on, and directly below the weldseam. This will typically require masking a strip along the underside of each end
(edge) of each bottom plate approximately 5 cm (2 inch) wide. Coal tar Epoxy paint
shall be specified for tank with maximum operation temperature of 70C (158F),
while Epoxy coating for Atmospheric service shall be specified for higher operationtemperatures up to 150C.
14.4 (9.4) In tanks where internal coating is not required, top side of the bottom and
the bottom portion of the shell, starting from the tank bottom up to minimum onefoot above water line, shall be coated according to the applicable coating
specifications.
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14.5 (9.5) Gasket contact surfaces shall not be coated or painted.
14.6 (9.6) The tank number and content shall be painted in both Arabic and English
at 90 degree intervals around the tank.
15 (10 )Documentation
The Tank Manufacturer and internal floating roof manufacturer shall prepare
drawings, calculations, and data in accordance with Form NMR-7918-1 and FormNMR-7918-2, Non-Material Requirements, as applicable.
Drawings and calculations, which are approved by the Design Engineer, shall notrelieve the Manufacturer of the responsibility to comply with the Code and this
specification.
16 (11) Disinfection
16.1 (11.1) All potable water storage tanks shall be disinfected in accordance with
AWWA C652.
16.1.1 (11.2) The chlorine and bacteriological tests shall be approved by the CompanyRepresentative.
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Appendix B Recommendations for Design and Construction of Foundations forAboveground Oil Storage Tanks
B.2 Subsurface Investigation and Construction
B.2.6 Top fill layer 10-15 cm (4-6 inch) shall be a mixture of sweet sand and 3% cement(33:1 ratio, i.e., 3% cement). The material specifications and mixing requirements
shall be as follows:
1) The maximum permissible soil content is 0.1%. Sand shall be dried to a free-
moisture content of not more than 2.0% by weight of dry soil.
2) The dry sand must be screened through 6.4 mm (1/4 inch) mesh (maximum).Care must be taken in using clean mixing and handling equipment to ensure
mixture remains free from foreign matter.
3) The sand shall then be thoroughly mixed with cement in a 33:1 ratio by weight
in a concrete mixer. After laying the mixture shall be rolled a minimum sixtimes by a 3-ton roller. Vibratory plate tampers may be used in lieu of rollers
for areas where a roller cannot reach and/or cover.
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Appendix C - External Floating Roofs
C.2 MATERIAL
Exceptions
Galvanized parts shall not be used.
Electrical bonding shunt materials shall be Type 304 stainless steel.
C.3 DESIGN
C.3.3 Decks
C.3.3.1 Exception
Roofs shall be of the contact type designed to eliminate the presence of any air-vapor
mixture under the deck.
C.3.4 Pontoon Design
C.3.4.1 Floating roofs shall have sufficient buoyancy to remain afloat based on the lower of
the product specific gravity or 0.7, with the primary drain inoperative for theconditions stated in API STD 650.
C.3.3.5 The deck of single deck pontoon floating roofs shall be in contact with the liquid
during normal operation.
C.3.3.6 Roofs greater than 91 m (300 foot) in diameter shall be of the double-deck type.
C.3.7 Ladders
C.3.7.1 Rolling ladders shall meet the following requirements:
1) The minimum inside width of the ladder shall be 710 mm (28 inch).
2) Wheels shall be provided at the lower end of the ladder and sized to prevent
binding of the ladder at any position and provided with sealed non-lubricating
bearings.
3) Self-leveling treads shall be used for the ladder.
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C.3.8 Roof Drains
Exception
External floating roofs shall be provided with primary drains of either the flexible pipe
(Coflexip or equal), or the articulated pipe type. A swing type check valve shall be provided
at the inlet of the drain. Siphon type drains are not acceptable for primary roof drains.
Siphon type drains, however, may be provided as a secondary roof drain if specified on the
Storage Tank Data Sheet. Emergency drains for double deck floating roofs shall be of the
open-type design.
C.3.9 Vents
C.3.9.1 As a minimum, two overpressure/vacuum bleeder type vents shall be installed.
Vents shall be sized to handle a total of 125% of the maximum filling/withdrawal
rates that are specified on the Storage Tank Data Sheet.
Commentary Note:
Bleeder vents shall be designed to open and close automatically when the roof is 75mm
above its low support legs position upon emptying and filling the tank, respectively.
C.3.9.2 Vents for protection against overpressure/vacuum, while the roof is floating, shall beprovided as follows:
1) Their overall capacity shall be determined according to API standard 2000
requirements, considering 25% of the filling/emptying rates and 100% of
thermal breathing.
2) Vents shall be evenly distributed and close to the roof periphery enough ventsshall be provided close to the inlet diffuser in services where gas slugs are
expected.
3) Vents shall be designed so as not to allow any carry over of stored liquid onto
the floating roof.
Commentary Notes:
1) Normally, vents are of the open type that does not undergo testing but rather in-situ
inspection. In case relief valves are used, their number shall be such that the total
required venting capacity is always available when a number of valve(s) are removed
for testing.
2) Anticipated operation upset conditions such as an increase in temperature of the input
stream to a tank or chemical injection that will result in vaporization beyond that
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Page 29 of 39
associated with the true vapor pressure design limit of 90 kPa (13 psia) and gaspurges shall be also considered in determining the required venting capacity.
C.3.10 Supporting Legs
C.3.10.3 Support legs shall be carbon steel pipe, Schedule 80 minimum thickness.
C.3.10.4 Support legs shall be adjustable to two positions. The lower position shall allow the
roof to descend to a position at least 75 mm (3 inch) above internal accessories orroof seal mechanism. The higher position shall provide a 2 m (79 inch) clearance
between the lowest portion of the roof and the tank floor.
C.3.10.5 Bearing plates shall be provided under all support legs so as to distribute the weightof the internal floating roof on the tank bottom plates and to avoid damage to internal
tank coatings. The bearing plates shall be twice the diameter of the support section,12.7 mm (1/2 inch) thick, and shall be attached to the bottom by 4.8 mm (3/16 inch)
continuous fillet welds.
C.3.11 Roof Manholes
Roof manholes shall be provided in accordance with JERSD-D-0001.
C.3.13 Seals
Exceptions
1) If the sealing device employs steel shoes in contact with the shell (pantograph-type),
such shoes shall be made of only Type 304 stainless steel with a minimum nominal
thickness of 1.5 mm (16 gauge).
A low-density polymer type plastic insulation cover shall be provided at the joint
between the middle arm of the pantograph hanger and the connecting rod of the steel
shoe. The insulation cover shall have a press-type locking system and completely
electrically insulate the pantograph hanger with the seal shoe.
2) Any fabric or non-metallic materials used as a seal or seal component shall be
selected based on the design temperature, flammability, permeability, abrasion
resistance, aging, resistance to aromatics, and chemical resistance, and selected fromthe following Table.
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Seal Materials Table
Fluid Stored Non-Metallic Seal Material
Crude Oil Viton GF (FKM-GF)
Aflas (TFE/P)
Viton (FKM)
Refined Products PFA(Perfluoroalkoxy)
PTFE(Teflon) laminate
PTFE (Teflon) laminate
Gasoline/MTBE Blend KALREZ (Perfluoroelastomer)
CHEMRAZ (Perfluoroelastomer)
KALREZ (Perfluoroelastomer)
MTBE (100%) CHEMRAZ (Perfluoroelastomer)
PTFE (Teflon) laminate
Materials properties verification shall be performed by an independent laboratory.
3) The Tank Manufacturer may offer an alternate design and material at the time
of proposal. However, the alternate design shall comply with the following
requirements:
a) Seals shall be located on the skirt.
b) Materials for non-metallic components of seals shall meet requirements
in paragraph C3.13 (2) of this specification.
4) All fabric or non-metallic materials used as a seal or seal component shall havea flammability spread index not exceeding 25 established per NFPA 255.
5) All fasteners used in sealing devices shall be Type 304 stainless steel.
6) Design of secondary seals shall permit the inspection of primary seals withoutremoval of the secondary seals.
7) Fabric seal in sealing devices that employ steel shoes in contact with the shell
may be installed after the hydrostatic test.
C.3.14 Gauging devices shall be provided per paragraph 3.8.15 of this specification.
C.3.15 Bonding Shunts
Bonding shunts shall be provided on floating roofs in accordance with JERSD-P-
0003and API RP 2003 requirements.
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Appendix G Structurally Supported Aluminum Dome Roofs
G.1 General
G.1.4 Special features
G.1.4.2 Exception
The aluminum dome roof materials shall have a mill finish.
G.2 Materials
G.2.1 General
Exception
Materials for all roof components shall be compatible with the intended service.
Alternate material for any roof component (structural frame, roof panels, node
covers, bolts, fasteners, sealant and gasket material, and skylight panels) shall not
be used without prior approval of the Company Representative, as defined in Section
3 of this specification.
G.2.3 Roof Panels
Exception
Roof panels and node covers shall be fabricated from Series 3000 (H32 or H34 temper) or
5000(H32 or H34 temper) aluminum with a minimum nominal thickness of 1.2 mm (0.05
in.).
G.2.4 Bolts and Fasteners
Exception
Bolts and fasteners shall be of 7075-T73 aluminum, 2024-T4 aluminum, or 300 Series
stainless steel (AISI 302 or AISI 304). Only 300 Series stainless steel (AISI 302 or AISI
304) bolts shall be used to attach aluminum to steel.
400 Series stainless steel or aluminized mild steel HV-Huck-Lock bolts shall be used for
joining structural members (struts) at the space truss nodes.
G.5 Roof Attachment
G.5.3 Separation of carbon Steel and Aluminum
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Exception
Aluminum shall be isolated from carbon steel by austenitic stainless steel spacers.
G.5.5 The dome surface paneling shall be designed as a watertight system under all design
load and temperature conditions. All edges of aluminum panels shall be covered,
sealed, and firmly clamped with batten in an interlocking manner to prevent slippingor disengagement under all load and temperature conditions.
G.8 Roof Vents
G.8.4.3 Surface appurtenances and closure panel joints shall be designed watertight without
the use of sealants.
G.10 Testing
G.10.2 100% liquid penetrant examinations shall be performed on structural welds and
components joined by welding.
G.11 Fabrication and Erection
G.11.5 Erection
Exception
Structural frame members (struts) shall be joined at nodes by preset-torque level HV-
HUCK-Lock bolts.
G.11.6 Workmanship
Exception
Sealant shall be applied and installed in a manner suitable to that of architectural class
work. Joint surfaces shall be clean to ensure adhesion of sealants. All exposed sealant
surfaces shall be tooled slightly concave after sealant is placed in joints. Misplaced excess
sealant shall be removed.
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Appendix H - Internal Floating Roofs
H.1 Scope
Exception
Types of internal floating roofs are limited to those specified in paragraph H.2.2 of this
specification. Other types stipulated or referenced in API 650, Appendix H shall not be
considered.
H.2 Types
H.2.1 Exception
The internal floating roof shall be selected by the design engineer.
H.2.2 Exception
Only type c(metallic pontoon roofs), type d(metallic double-deck roofs) or type
e(metallic roofs on floats) shall be used.
H.3 Material
H.3.1 Exception
The Design Engineer shall specify the materials required.
Internal floating roofs with non-metallic components as part of the floats are
prohibited.
H.3.2 Steel
Exception
Galvanized components shall not be used.
H.3.3 Aluminum
Exceptions
Aluminum shall not be used in services where caustic constituents are present in the stored
liquid.
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Delete reference to sandwich panel type.
H.4 Requirements for All Types
H.4.1 General
H.4.1.6 (Exception)
H.4.1.6.1 A minimum of four anti-static stranded stainless steel cables of minimum 3 mm indiameter, uniformly distributed, shall be provided from the fixed roof to the internal
floating roof. Design of the cables shall take into account strength, flexibility, joint
reliability and service life.
H.4.1.6.2 All moveable cover accessories (hatches, manways, pressure relief devices and otheropenings) on the internal floating roof shall be bonded to the internal floating roof to
prevent static electricity sparking when they are opened. The cable shall beminimum 3.2 mm (1/8) in diameter of stranded stainless steel, with a length at least
twice the normal travel of these device covers. Design of the cables shall take into
account strength, flexibility, joint reliability and service life.
H.4.1.8 Exceptions
All closed floating compartments shall be seal welded to prevent liquid or vapor
entry.
Delete reference to floating roof type H.2.2.g.
H.4.1.9 Delete this paragraph.
H.4.1.10 Exception
Drains for decks surfaces above the liquid level shall be designed to return any
spillage or condensate to the product. Such drains shall close automatically or
extended at least 100 mm (4 in.) into the product to minimize vapor loss.
H.4.2 INTERNAL FLOATING ROOF DESIGN
H.4.2.4 Delete reference to floating roof type H.2.2.g.
H.4.3 JOINT DESIGN
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H.4.3.3 Exception
Pivot joints that allow flexure between adjacent floats shall be provided on internal
floating roof designs that employ a metallic roof on tubular floats.
H.4.3.3.1 Exception
Only austenitic type stainless steel SS 304 hardware shall be used to join aluminum
and/or stainless components to each other or to carbon steel.
H.4.4 PERIPHERAL SEALS
H.4.4.2 The peripheral seal type and material shall selected by the Design Engineer.
H4.4.5 Seal Types
Exceptions
Any fabric or non-metallic materials used as a seal or seal component shall be selected
based on the design temperature, permeability, abrasion resistance, aging, flammability,
resistance to aromatics, and chemical resistance, and selected from the table in
paragraph C3.13.2 of this specification.
Only resilient foam-filled liquid-mounted and vapor-mounted rim seals shall be used.
Circumferential joints in envelope fabric seals shall overlap by at least 150 mm (6 in.). Galvanized steel components are prohibited.
All fabric or non-metallic materials used as a seal or seal component shall have a
flammability spread index not exceeding 25 established per NFPA 255.
H4.4.6 Fabric or non-metallic materials used as a seal or seal component shall be tested fortheir compatibility with the intended service by an independent laboratory.
H.4.5 ROOF PENETRATIONS
Exception
All roof penetrations shall be surrounded by a well that extends at least 100 mm (4
in.) into the stored liquid.
H.4.6 Roof Supports
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H.4.6.1 Exception
The floating roof shall be provided with fixed or adjustable supports.
H4.6.2 Exception
The height of the floating roof shall be adjustable to two positions with the tank out
of service. The design of the supports shall prevent damage to the fixed roof and
floating roof at the tank maximum design liquid level.
H.4.6.3 Exception
The high (maintenance) of adjustable roof supports position shall provide a 2 m (79foot) clearance between the lowest portion of the roof and the tank floor.
H.4.6.4 Exception
Delete reference to floating roof types H.2.2.a, b and g.
H.4.6.5 Exception
Drainable pipe supports shall be used.
H.4.6.6 Exception
Steel bearing plates shall be provided under all support legs so as to distribute the
weight of the internal floating roof on the tank bottom plates and to avoid damage to
internal tank coatings. The bearing plates shall be twice the diameter of the support
section, 12.7 mm ( inch) thick, and shall be attached to the bottom by 4.8 mm (3/16
inch) continuous fillet welds.
H.4.6.9 Where propeller-type mixers are used, the support legs shall provide a minimum
clearance of 300 mm (12 inch) from the underside of the internal floating roof to thetop of the mixer paddle(s).
H.4.6.10 Jet-nozzle mixers are not permitted.
H.5 OPENINGS AND APPURTENANCES
H.5.2 Vents
H.5.2.1 Pressure-Vacuum (Bleeder) Vents
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Exception
As a minimum, two overpressure/vacuum bleeder type vents shall be installed in the
internal floating roof. Vents shall be sized to handle a total of 125% of the maximum
filling/withdrawal rates that are specified on the Storage Tank Data Sheet.
Commentary Note:
Bleeder vents shall be designed to open and close automatically when the roof is 75 mm (3
inch) above its low support legs position upon emptying and filling the tank, respectively.
H.5.2.2 Tank Circulation Vents
H5.2.2.1 Exception
Peripheral circulation vents shall be located at the top of the shell with an outward
projecting cover. Air intake shall be from the cover bottom side to minimize dust
ingress.
H.5.2.2.4 Circulation venting and venting devices shall provide protection against
overpressure/vacuum for normal conditions (resulting from operational requirementsand atmospheric changes) and emergency conditions (resulting from exposure to an
external fire) according to API STD 2000.
H5.2.3 Vents for protection against overpressure/vacuum, while the roof is floating, shall be
provided as follows:
1) Vents shall be sized according to API STD 2000 requirements, considering25% of the filling/emptying rates and 100% of thermal breathing.
2) Vents shall be evenly distributed and close to the roof edge with enough vents
shall be provided close to the inlet diffuser in services where gas slugs are
expected.
3) Vents shall be designed so as not to allow any carry over of stored liquid ontothe floating roof.
Commentary Note:
Anticipated operation upset conditions such as an increase in temperature of the input
stream to a tank or chemical injection that will result in vaporization beyond that associated
with the product true vapor pressure design limit of 90 kPa absolute (13 psia) or gas purges
shall be also considered in determining the required venting capacity.
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Page 38 of 39
H.5.5.3 Inspection Hatches
Exception
Inspection hatches shall be located on the fixed roof to permit visual inspection of the
seal region.
H.5.6 Inlet Diffuser
Exception
Inlet diffuser shall be specified according to paragraph 3.8.12 of this specification.
H5.7 Gauging And Sampling Devices
Exception
Internal floating roofs shall be provided with gauging and sampling devices when specified
by the Design Engineer.
H.6 Fabrication, Erection, Welding, Inspection, and Testing
H.6.4 Exception
Floatation test and initial fill inspection shall be performed by the erector andwitnessed by the purchaser.
H.6.4.1 Exception
Delete reference to floating roof types H.2.2.a, b, g and f.
H.6.4.3 Exception
Potable water having less than 500 ppm chlorides shall be used for testing when the
internal floating roof is constructed of aluminum or stainless steel.
H.6.5 Internal floating roof components that are fabricated or attached by welding, such asclips, gusset plates, etc., shall be completely seal-welded.
H.6.6 Shop Fabrication
H.6.6.1 Straightening of material shall be done by pressing or other non-injurious methods
before the material is laid out or worked on in any way. Materials shall not behammered.
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H.6.6.2 When the edges of plates are cut with a torch, the resulting surface shall be uniform,smooth, and free from scale and slag before performing any welding.
H.6.7 Shop Inspection and Testing
H.6.7.1 Internal floating roofs manufactured in accordance with this specification are subject
to verification by the Company Inspector in accordance with Company InspectionRequirements Form 175-324900.
H.6.7.2 Inspection at the mill, shop, or fabrication yard shall not release the manufacturer ofthe internal floating roof from responsibility for repairing or replacing any defective
material or workmanship that may be subsequently discovered in the field.
H.6.7.3 All support brackets that are welded to tubular pontoons shall be dye-penetrantinspected.
H.6.7.4 Welded tubular pontoons shall be pneumatically pressure tested with air at 35 kPa (5
psig) and the welds visually inspected by using a soapy water solution or by
immersing the pontoons under water. All defective welds shall be repaired and the
pontoons re-tested prior to shipment.
H.7 Installation
H.7.1 Internal floating roofs shall be installed by contractors who have been approved bythe manufacturer of the internal floating roofs.
H.7.2 Internal floating roofs shall be installed in accordance with the procedures specifiedby the internal floating roof manufacturer.
H.8 Drawings and Calculations
The internal floating roof manufacturer shall prepare drawings, calculations, and datain accordance with Form NMR-7918-2, Nonmaterial Requirements. Drawings and
calculations that are approved by the Design Engineer shall not relieve the internal
floating roof manufacturer of the responsibility to comply with API STD 650 and
this specification.
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