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GB 50341-2014 English PDF (GB50341-2014)

GB 50341-2014 English PDF (GB50341-2014)

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GB 50341-2014: Code for design of vertical cylindrical welded steel oil tanks

This code is formulated to standardize design of vertical cylindrical welded steel oil tanks and make it advanced in technology, cost-effective, safe and applicable and high quality. 1.0.2 This code is applicable to design of vertical cylindrical welded steel oil tanks at and close to normal pressure for storing petroleum and petrochemical and other similar liquid but it is not applicable to design of buried tank, tank holding extremely and highly hazardous medium and artificial refrigerant fluid tank.
GB 50341-2014
UDC GB
NATIONAL STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
P GB 50341-2014
Code for Design of Vertical Cylindrical Welded Steel Oil Tanks
ISSUED ON. MAY 29, 2014
IMPLEMENTED ON. MARCH 1, 2015
Jointly issued by. Ministry of Housing and Urban-Rural Development;
General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China.
3. No action is required - Full-copy of this standard will be automatically & immediately delivered to your EMAIL address in 0~60 minutes.
Contents
Foreword??...??6
1 General Provisions??...??8
2 Terms??...??8
3 Basic Requirement??...??9
4 Materials??...??11
4.1 General Requirement??...??11
4.2 Steel Plates??...??12
4.3 Steel Pipe??...??14
4.4 Forgings??...??15
4.5 Screw and Nut??...??17
4.6 Structural Steel??...??17
4.7 Welding Materials??...??18
5 Bottom Design??...??18
5.1 Size of Bottom Plates??...??18
5.2 Bottom Structure??...??19
6 Shell Design??...??22
6.1 Shell Plate's Arrangement and Connection??...??22
6.2 Curb Angle??...??23
6.3 Shell Thickness??...??24
6.4 Wind Girder??...??25
7 Fixed Roof??...??30
7.1 General Requirement??...??30
7.2 Allowable Stress of Structural Components??...??32
7.3 Self-supporting Cone Roof??...??34
7.4 Column-Supported Cone Roof??...??35
7.5 Self-supporting Dome Roof??...??36
8 Floating Roof??...??38
8.1 General Requirement??...??38
8.2 Structure and Connection of Floating Roof??...??39
8.3 Floating Roof Supports??...??39
8.4 Primary Floating Roof Drains??...??40
8.5 Emergency Roof Drains??...??40
8.6 Rolling Ladder and Track...??40
8.7 Automatic Bleeder Vents??...??41
8.8 Guiding Devices??...??41
8.9 Peripheral Seals and Static Extracting Devices??...??41
8.10 Floating Roof Manhole??...??42
8.11 Compartment Manhole??...??42
8.12 Wax Scrapers??...??42
9 Internal Floating Roof??...??42
9.1 General Requirement??...??42
9.2 Open-Top Bulk-Headed, Single-Deck and Double-deck Internal Floating Roof??...??43 9.3 Internal Floating Roof on Floats??...??44
9.4 Internal Floating Roof Supports??...??44
9.5 Peripheral Seals??...??44
9.6 Automatic Bleeder Vents??...??45
9.7 Vents??...??45
9.8 High Liquid Level Protection??...??46
9.9 Guiding Devices??...??46
9.10 Manhole and Inspection Hatches??...??46
10 Appurtenances??...??46
10.1 General Requirement??...??46
10.2 Shell Opening and Reinforcement??...??47
10.3 Shell Manholes??...??48
10.4 Shell Nozzles??...??51
10.5 Flush-type Cleanout Fittings??...??56
10.6 Roof Manholes??...??61
10.7 Roof Nozzles??...??62
10.8 Drain Elbows??...??63
10.9 Water Draw-off Sumps??...??64
10.10 Spiral Stairway, Platforms and Handrails??...??65
10.11 Scaffold Cable Support??...??66
10.12 Protection against Lightning, Static and Others??...??67
11 Wind Stable Calculation and Anchorage Design of Oil Tanks??...??67
11.1 Wind Stable Calculation??...??67
11.2 Anchorage Design??...??69
12 Prefabrication, Assembling, Welding and Inspection??...??71
12.1 Prefabrication, Assembling and Welding??...??71
12.2 Non-destructive Testing and Tests of Welding Seam??...??72
12.3 Geometry and Dimension Inspection??...??75
12.4 Water Filling Test??...??77
12.5 Fixed Roof Test??...??78
Appendix A Design of Tank for Small Internal Pressures??...??79
Appendix B Design of Storage Tank for External Pressure??...??83
Appendix C Requirements for Tank Operating at Elevated Temperatures??...??93 Appendix D Seismic Design of Oil Tank??...??95
Appendix E Basic Requirement of Foundation and Basis for Oil Tank??...??102 Appendix F Load Combinations??...??106
Appendix G Variable-design-point Method on Tank Shell Thickness Calculation??...??108 Appendix H Calculation for Spherical Dome Roof with Rib Reinforcement??...??111 Appendix J Allowable External Loads on Shell Openings??...??114
Explanation of Wording in This Code??...??124
List of Quoted Standards??...??125
Foreword
According to the requirements of Ministry of Housing and Urban-Rural Development in Notice on Printing Development and Revision Plan of National Engineering Construction Standards and Codes in 2011 (JIANBIAO [2011] No. 17), the code drafting group summarizes experience from GB 50341-2003 Code for Design of Vertical Cylindrical Welded Steel Oil Tanks, refers to relevant international and foreign advanced standards and revises this code based on extensive investigation and solicitation of opinions, discussion and modification.
This code covers the design of vertical cylindrical welded steel oil tanks in following main technical aspects, including materials, bottom design, shell design, fixed roof, floating roof, internal floating roof, appurtenances, wind stable calculation and anchorage design of oil tank, tank for small internal pressures, design of storage tank for external pressure, requirements for tank operating at elevated temperatures, seismic design of oil tank, basic requirement of foundation and basis for oil tank, load combinations, variable-design-point method on tank shell thickness calculation, calculation for spherical dome roof with rib reinforcement, allowable external loads on shell openings.
There have been some significant changes in this code in the following technical aspects. 1. Chapter 11 "Wind Stable Calculation and Anchorage Design of Oil Tank", Appendix B "Design of Storage Tank for External Pressure", Appendix F "Load Combinations", Appendix G "Variable-design-point Method on Tank Shell Thickness Calculation" and Appendix J "Allowable External Loads on Shell Opening" are added;
2. Design negative pressure of atmospheric pressure storage tank is revised; positive design pressure of fixed-roof oil tank is increased to 18kPa and the maximum design negative pressure is increased to 6.9kPa;
3. Allowable stress of materials is revised; materials of Q235-A.F, Q235-A, Q345-C, Q345-D, 15MnNbR, 07MnNiCrMoVDR are removed;
4. Minimum sketch bottom plate?€?s thickness and lap width limit between bottom plates are revised; extension limit of sketch bottom plates is adjusted;
5. Liquid level and welded joint coefficient are revised in the formula for calculating shell thickness by fixed-design-point method;
6. Calculation formula for top wind girder section modulus is revised;
7. When fixed-roof oil tank roof and shell use weakly connected structure, the requirements, roof thickness and calculation formula of effective sectional area are revised; support guide support structure form and requirements of supporting cone roof and monolayer spherical latticed shell requirements are added;
8. The requirements by which the floating roof structure design shall comply, limitation of floating roof compartment to meet the tightness requirements, the relevant requirements of peripheral seals and static extracting devices are revised; the relevant requirements of wax scrapers are added;
9. Electrical continuity and static extracting of internal floating roof are revised; the relevant requirements of compartment welding are added;
10. Specification and dimension of nozzle reinforcement plate, flanged connection shell 1 General Provisions
1.0.1 This code is formulated to standardize design of vertical cylindrical welded steel oil tanks and make it advanced in technology, cost-effective, safe and applicable and high quality. 1.0.2 This code is applicable to design of vertical cylindrical welded steel oil tanks at and close to normal pressure for storing petroleum and petrochemical and other similar liquid but it is not applicable to design of buried tank, tank holding extremely and highly hazardous medium and artificial refrigerant fluid tank.
1.0.3 Design of vertical cylindrical welded steel oil tanks shall comply with not only this code but the current relevant national standards.
2 Terms
2.0.1 Annular/sketch bottom plates
The outermost bottom plates at the lower part of shell plates.
2.0.2 Annular bottom plates
Annular/sketch bottom plates with polygonal or circular inner edge.
2.0.3 Bottom plates
Bottom plates except edge plate.
2.0.4 Fixed roofs
Roof around which shell ends are fixed and connected, mainly including types as follows.
1 Self-supporting cone roof. with circular cone roof and supported only by the shell periphery;
2 Column-supported cone roof. with circular cone roof and supported by shell, girder, column or other structure;
3 Self-supporting dome roof. with spherical roof and supported only by the shell periphery.
2.0.5 Floating roofs
Roof which lifts with the liquid level, including external floating roof, in an open-top oil tank and internal floating roof, in fixed-roof oil tank. Generally, the floating roof tank refers to external floating roof tank if not specified. There are major floating roofs as follows. 1 Sing...

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