1.1 This standard specifies the requirements of design (including rule-based and analysis-based, similarly hereinafter), manufacture, assembly welding, inspection and acceptance for steel spherical tanks (hereinafter referred to as "spherical tanks").
1.2 This standard is applicable to orange-type or hybrid-type column supported spherical tanks with design pressure not greater than 6.4 MPa and design temperature range as per the steel allowable service temperature.
1.3 This standard is not applicable to:
a) spherical tanks in nuclear-energy plant;
b) spherical tanks subjected to relative movement (e.g. on-board);
c) spherical tanks less than 50 m3 in nominal capacity;
d) double-decked spherical tanks.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 150.1~150.4-2011 Pressure Vessels
GB/T 228.1 Metallic Material - Tensile Test - Part 1: Ambient-temperature Test
CB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 232 Metallic Materials - Bend Test
GB/T 699 Quality Carbon Structural Steels
GB/T 700 Carbon Structural Steels
GB 713 Steel Plates for Boilers and Pressure Vessels
GB/T 985.1 Recommended Joint Preparation for Gas Welding Manual Metal Arc Welding Gas-shield Arc Welding and Beam Welding
GB/T 985.2 Recommended Joint Preparation for Submerged Arc Welding
GB/T 1220 Stainless Steel Bars
GB/T 3077 Alloy Structure Steels
GB/T 3274 Carbon Structural and Low Alloy Steel - Rolled Plates And Strips
GB 3531 Low Alloy Steel Plates for Low Temperature Pressure Vessels
GB/T 3965 Methods for Determination of Diffusible Hydrogen in Deposited Metal
GB/T 4842 Argon
GB/T 6052 Industrial Liquid Carbon Dioxide
GB 6479-2000 Seamless Steel Tubes for High-Pressure for Chemical Fertilizer Equipment
GB/T 6803 Test Method for Drop-weight Test to Determine Nil-ductility Transition Temperature of Ferritic Steels
GB/T 8162 Seamless Steel Tubes for Structural Purposes
GB/T 8163 Seamless Steel Tubes for Liquid Service
GB 9948 Seamless Steel Tubes for Petroleum Cracking
GB/T 12771 Welded Stainless Steel Pipes for Liquid Delivery
GB 13296 Seamless Stainless Steel Tubes for Boiler and Heat Exchanger
GB/T 14976 Stainless Steel Seamless Tubes for Fluid Transport
GB/T 17261 Steel Spherical Tanks Type and Dimension Data Base
GB/T 18591 Welding - Guidance on the Measurement of Preheating Temperature - Interpass Temperature and Preheat Maintenance Temperature
GB 19189 Quenched and Tempered High Strength Steel Plates for Pressure Vessels
GB/T 20878 Stainless and Heat-resisting Steels - Designation and Chemical Composition
GB/T 21433 Detecting Susceptibility to Intergranular Corrosion in Stainless Steel Pressure Vessels
GB 24511 Stainless Steel Plate, Sheet and Strip for Pressure Equipment
GB/T 26929-2011 Terminology for Pressure Vessels
GB 50009 Load Code for the Design of Building Structures
GB 50011 Code for Seismic Design of Buildings
GB 50017 Code for Design of Steel Structures
JB/T 4711 Coating and Packing for Pressure Vessels Transport
JB/T 4730.1 Nondestructive Testing of Pressure Equipment - Part 1: General Requirements
JB/T 4730.2 Nondestructive Testing of Pressure Equipment - Part 2: Radiographic Testing
JB/T 4730.3 Nondestructive Testing of Pressure Equipment - Part 3: Ultrasonic Testing
JB/T 4730.4 Nondestructive Testing of Pressure Equipment - Part 4: Magnetic Particle Testing
JB/T 4730.5 Nondestructive Testing of Pressure Equipment - Part 5: Penetrant Testing
JB/T 4730.6 Nondestructive Testing of Pressure Equipment - Part 6: Eddy Current Testing
JB 4732-1995 Steel Pressure Vessels - Design by Analysis (Confirmed in 2005)
NB/T 47008 Carbon and Alloy Steel Forgings for Pressure Equipment
NB/T 47009 Low-alloy Steel Forgings for Low Temperature Pressure Equipment
NB/T 47010 Stainless and Heat-resisting Steel Forgings for Pressure Equipment
NB/T 47013.10 (JB/T 4730.10) Nondestructive Testing of Pressure Equipment - Part 10: Ultrasonic Time of Flight Diffraction Technique
NB/T 47014 (JB/T 4708) Welding Procedure Qualification for Pressure Equipment
NB/T 47015 (JB/T 4709) Welding Specification for Pressure Vessels
NB/T 47016 (JB/T 4744) Mechanical Property Tests of Products Welded Test Coupons for Pressure Equipment
NB/T 47018.1 (JB/T 4747.1) Technical Permission of Welding Materials for Pressure Equipment - Part 1: General Rule
NB/T 47018.2 (JB/T 4747.2) Technical Permission of Welding Materials for Pressure Equipment - Part 1: Steel Welding Rod
NB/T 47018.3 (JB/T 4747.3) Technical Permission of Welding Materials for Pressure Equipment - Part 3: Steel Electrodes and Rods for Gas-shielded Arc Welding
NB/T 47018.4 (JB/T 4747.4) Technical Permission of Welding Materials for Pressure Equipment - Part 4: Electrodes and Fluxes for Submerged Arc Welding
TSG R0004-2009 Supervision Regulation on Safety Technology for Stationary Pressure Vessel
3 General Provisions
3.1 General Requirements
The design, manufacture, assembly welding, inspection and acceptance of spherical tank shall comply with not only this standard but also GB 150.1~150.4 and JB 4732.
3.2 Management System
The units for the design, manufacture, and assembly welding of spherical tank shall develop and effectively implement a sound quality management system.
3.3 Statement of Conformity
The design, manufacture, assembly welding of spherical tank within the jurisdiction of TSG R0004 shall undergo the supervision of safety supervision unit for special equipment. This standard conforms to the basic safety requirements specified in the nationally-issued pressure vessel safety codes and the statement of conformity of the standard is as specified in Appendix A.
3.4 Delimitation of Spherical Tank
3.4.1 Connection between spherical tank and external pipe:
a) Beveled end of the first girth joint of welded connection;
b) The first flange sealing surface of flange connection.
3.4.2 Pressure head, flat cover and fasteners of spherical tank nozzles and manholes
3.4.3 Connection weld joint between non-pressure parts and spherical shell
3.4.4 Non-pressure parts, e.g. column, strut and base plate, directly connected to spherical tank.
3.4.5 Safety attachments:
a) The overpressure relief devices of spherical tank shall comply with Appendix B in GB 150.1-2011 or Appendix E in JB 4732-1995.
b) Valves and instrumentation of spherical tank shall comply with Appendix B.
3.5 Qualifications and Responsibilities
3.5.1 Qualifications
Include:
a) Design units of the spherical tank within the jurisdiction of TSG R0004 shall hold a license for design of special equipment (pressure vessel - spherical tank). If analysis-based design is to be performed, they shall hold a license for design of special equipment (pressure vessel - analysis-based design) additionally.
b) Manufacturer of the spherical tank within the jurisdiction of TSG R0004 shall hold a license for manufacture of special equipment (pressure vessel - manufacture of spherical shell plate);
c) Assembly welding units of the spherical tank within the jurisdiction of TSG R0004 shall hold a license for manufacture of special equipment (pressure vessel - on-site assembly welding of spherical tank).
3.5.2 Responsibilities
