GB/T 18442.2-2019Static vacuum insulated cryogenic pressure vessels—Part 2:Materials (English PDF)

Foreword

GB/T 18442 "Static vacuum insulated cryogenic pressure vessels" is divided into the following 7 parts:

- Part 1: General requirements;

- Part 2: Materials;

- Part 3: Design;

- Part 4: Fabrication;

- Part 5: Inspection and test;

- Part 6: Safety device requirements;

- Part 7: Rules of pressure strengthening for inner vessels.

This Part is Part 2 of GB/T 18442.

This Part is drafted in accordance with the rules given in GB/T 1.1-2009.

This Part replaces GB/T 18442.2-2011 "Static vacuum insulated cryogenic pressure vessel - Part 2: Material". Compared with GB/T 18442.2-2011, the main technical changes of this Part are as follows:

- Delete 5 terms and definitions such as annular space and tank;

- Modify the general requirements for materials;

- Modify the requirements for steel plate for tank, steel forging, pipes and fittings, insulation material, adsorbent material, welding material, support material for annular space, purchased parts, and other materials;

- Modify the property index and quality control requirements of tank materials.

1 Scope

This Part of GB/T 18442 specifies the basic requirements for steel plates, forgings, pipes and fittings, insulation materials, adsorbent materials, welding materials, annular space support materials, and purchased parts materials used for static vacuum insulated cryogenic pressure vessels (hereinafter referred to as "cryogenic vessels").

This Part applies to cryogenic vessels, which simultaneously meet the following conditions:

a) The working pressure of the inner vessel is not less than 0.1 MPa;

b) The geometric volume is not less than 1 m³;

c) The insulation method is vacuum powder insulation, vacuum composite insulation, or high vacuum multilayer insulation;

d) The storage medium is a refrigerated liquefied gas with a standard boiling point of not lower than -196 °C.

This Part does not apply to cryogenic vessels in the following scope:

a) The material of inner vessel and outer jacket is non-ferrous metal or non-metal;

b) HAVE a spherical structure;

c) Stacked insulation;

d) Mobile;

e) STORE refrigerated liquefied gas medium with standard boiling point below -196 °C;

f) The storage medium is toxic gas according to GB 12268;

g) Those with special requirements such as national defense and military equipment.

2 Normative references

The following documents are indispensable for the application of this document.

For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document.

GB/T 150 (all parts) Pressure vessels

GB/T 713 Steel plates for boilers and pressure vessels

GB/T 3531 Steel plates for low temperature pressure vessels

GB/T 13296 Seamless stainless steel tubes for boiler and heat exchanger

GB/T 13350 Glass wool and its products for thermal insulation

GB/T 13550 Molecular sieve 5A and its determination

GB/T 14976 Seamless stainless steel pipes for fluid transport

GB/T 17600 (all parts) Steel - Conversion of elongation values

GB/T 18442.1 Static vacuum insulated cryogenic pressure vessels - Part 1: General requirements

GB/T 24511 Stainless steel and heat resisting steel plate, sheet and strip for pressure equipments

GB/T 31480 Materials for high vacuum multilayer insulation of cryogenic vessel

GB/T 31481 Guidance for gas/materials compatibility of cryogenic vessels

HG/T 2690 Molecular sieve 13X

JC/T 1020 Expanded perlite for thermal isolation of low temperature equipment

3 Terms and definitions

The terms and definitions defined in GB/T 150 and GB/T 18442.1 apply to this document.

4 General requirements

4.1 The choice of materials shall consider the mechanical properties, physical properties, technological properties, and compatibility with the media.

4.2 The materials selected for the tank shall meet the requirements of TSG 21, GB/T 150.2, and the corresponding national standards or industry standards.

4.3 For materials which may come into contact with oxygen or oxygen-enriched environments, the compatibility with oxygen shall meet the requirements of GB/T 31481.

4.6 The fabrication organization of pressure component material shall provide a material quality certificate for the fabrication organization of cryogenic vessel. The content of the material quality certificate shall be complete, clear, printed with traceable informational identification, and stamped with the quality inspection seal of the material fabrication organization.

4.7 When the fabrication organization of cryogenic vessel obtains the materials for the tank and pipeline from the non-material fabrication organization, it shall obtain the original material quality certificate provided by the material fabrication organization; or obtain a copy affixed with the official seal of the material management organization and the signature (seal) of the person in charge.

5 Tank material

6 Welding material

6.1 Welding materials shall meet the requirements of NB/T 47018.1~NB/T 47018.4; have clear and firm marks; be accompanied by quality certificates.

6.2 The selection of welding materials shall consider the matching of the mechanical properties of the welding joint and the base metal of the tank; shall comply with the provisions of TSG 21.

6.3 Welding materials shall, according to the requirements of NB/T 47014, be subjected to welding procedure qualification; and can be used only after passing the qualification.

7 Support material for annular space

7.1 When non-metallic materials are used as support elements, the following requirements shall be met.

7.2 When using metallic materials as support elements, the low-temperature performance requirements of the product shall be met. Moreover, the use temperature shall be within the allowable use temperature range of the material. The material shall have good low-temperature impact toughness.

8 Purchased parts

8.1 Purchased parts shall meet the requirements of the corresponding national standards or industry standards; have quality certification documents or product qualification certificates.

8.2 Pressure piping components such as imported valves shall also comply with the relevant regulations of the national competent authority.

9 Other materials

9.1 The bearing material shall have sufficient strength and impact toughness; meet the requirements of the corresponding bearing standards. […]