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GB/T 29026-2012Spring loaded safety valve for cryogenic service (English PDF)

低温介质用弹簧直接载荷式安全阀

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine

Level / Type

National · Recommended

Issue date

December 31, 2012

Implementation date

October 1, 2013

Scope

GB/T 29026-2012 is the English-translated version of 低温介质用弹簧直接载荷式安全阀.

GB/T 29026-2012 — This Standard specifies the terms and definitions, structural form and structural length, technical requirements, inspection methods, inspection rules, signs, protection, packaging, transportation, and storage of spring loaded safety valve for cryogenic service (hereinafter referred to as "safety valve").

This Standard applies to safety valves for cryogenic gas service, of which the nominal pressure is PN16 ~ PN100; the nominal size is DN15 ~ DN200; the temperature is not less than -196 °C; the minimum set pressure is 0.1 MPa.

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Document preview — GB/T 29026-2012

National Standard of the People's Republic of China

ICS: 13.240
Classification: J 16

Issued by: General Administration of Quality Supervision, Inspection and Quarantine

Foreword...3
1 Scope...4
2 Normative references...4
3 Terms and definitions...5
4 Structural form and structural length...5
5 Technical requirements...6
6 Test method...9
7 Inspection rules...11
8 Signs, protection, packaging, transportation and storage...13

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard, with the use of the redrafting method, is compiled with reference

to BS EN 13648-1.2008, Cryogenic vessels - Safety devices for protection

against excessive pressure - Part 1.Safety valves for cryogenic service. It is

not equivalent to BS EN 13648-1.2008.

This Standard was proposed by China Machinery Industry Federation.

This Standard shall be under the jurisdiction of National Technical Committee

503 on Safety Devices for Protection against Excessive Pressure of

Standardization Administration of China (SAC/TC 503).

The drafting organizations of this Standard. Beijing Aerospace Petrochemical

Technology and Equipment Company.

Organizations that participate in the drafting of this Standard. Yuming Valve

Group Co., Ltd., Hangzhou Hangyang Tooling Valve Co., Ltd., National

Engineering Research Center for Special Pump and Valve, Yongyi Valve Group

Co., Ltd., Wujiang Dongwu Machine Co., Ltd., The Boiler & Pressure Vessel

Safety Inspection Institute of Henan Province.

The drafters of this Standard. Zhang Yukun, Yang Ying, Zhang Jiandong, Hu

Yun, Gan Aigen, Ze Xiaofeng, Dang Lingui.

Spring loaded safety valve for cryogenic service

1 Scope

This Standard specifies the terms and definitions, structural form and structural

length, technical requirements, inspection methods, inspection rules, signs,

protection, packaging, transportation, and storage of spring loaded safety valve

for cryogenic service (hereinafter referred to as "safety valve").

This Standard applies to safety valves for cryogenic gas service, of which the

nominal pressure is PN16 ~ PN100; the nominal size is DN15 ~ DN200; the

temperature is not less than -196 °C; the minimum set pressure is 0.1 MPa.

2 Normative references

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

For dated references, only the dated version applies to this document. For

undated references, the latest edition (including all amendments) applies to this

document.

GB/T 228.1, Metallic materials - Tensile testing - Part 1.Method of test at

room temperature (GB/T 228.1-2010, ISO 6892-1.2009, MOD)

GB/T 229, Metallic materials - Charpy pendulum impact test method (GB/T

229-2007, ISO 148-1.2006, MOD)

GB/T 12225, General purpose industrial valves - Specification of copper alloy

castings

GB/T 12230, General purpose industrial valves - Specification of stainless

steel castings

3 Terms and definitions

Terms and definitions determined by GB/T 12241 are applicable to this

document.

4 Structural form and structural length

4.1 Structural form

The typical structural form of the safety valve is shown in Figure 1.

Notes.

4.2 Structural length

The structural length of the safety valve is in accordance with the provisions of

JB/T 2203.

5 Technical requirements

5.1 General requirements

In addition to meeting the requirements of this Standard, safety valves shall

also meet the requirements of GB/T 12241 and GB/T 12243.If these standards

differ from the requirements of this Standard, this Standard shall prevail.

5.2 Structure and design

5.3 Materials

5.3.1 General

The materials that are used for the safety valve shall be selected according to

the operating temperature and material properties, and shall meet the following

requirements.

5.3.2 Metallic materials

5.3.2.1 Cryogenic steel castings are in accordance with JB/T 7248; copper alloy

castings are in accordance with GB/T 12225; austenitic stainless steel castings

are in accordance with GB/T 12230.The visual quality of steel castings is in

accordance with the provisions of JB/T 7927.

5.3.2.2 The cryogenic impact value shall meet the requirements of JB/T 7248.

5.3.3 Non-metallic materials

5.3.3.1 Non-metallic materials shall meet the minimum operating temperature

requirements, be able to pass normal and low temperature tests, and have

compatibility with oxygen.

5.4 Non-destructive testing

Non-destructive testing shall be in accordance with the provisions of JB/T 7248

and meet the corresponding requirements.

5.5 Degreasing

Before assembly, all parts shall be cleaned, and degreased if necessary.

5.6 Performance

5.6.4 Mechanical characteristics

The mechanical characteristics of the safety valve shall meet the requirements

of GB/T 12243.

5.6.5 Displacement

The displacement calculation of the safety valve is in accordance with GB/T

12241.

5.6.6 Cryogenic tightness

The cryogenic leakage rate of the safety valve shall not be greater than the

specifications in Table 1.

6 Test method

6.1 Normal temperature test

The normal temperature test items are in accordance with the requirements of

Table 2; the normal temperature test methods shall meet the requirements of

GB/T 12241, GB/T 12242 and GB/T 12243.

6.2 Materials

For the materials of the pressure-containing parts, the analysis of the chemical

composition is in accordance with the relevant standards; the mechanical

property test is in accordance with the provisions of GB/T 228.1; the cryogenic

impact test is in accordance with the provisions of GB/T 229.

6.3 Low temperature test

6.3.5 Tightness test procedure

After the safety valve pops up, open the globe valve on the test vessel land;

when the pressure is reduced to 70% of the set pressure of the safety valve,

close the globe valve, to allow the cryogenic medium in the system to naturally

vaporize the pressure; maintain the pressure in the test vessel at 90% of the

set pressure through the globe valve; observe the leakage at the outlet of the

safety valve. The test results shall meet the requirements of 5.6.6.

6.4 Signs, protection

Visual inspection of the safety valve's signs and protection shall comply with

the provisions of 8.1 and 8.2.

7 Inspection rules

7.1 Inspection classification

Safety valve inspection is divided into factory inspection and type inspection.

The inspection items, technical requirements and test methods are shown in

Table 2.

7.2 Factory inspection

Each safety valve must be subject to the factory inspection, and can be

delivered only when all item inspections are qualified.

7.3 Type inspection

7.3.1 In any of the following cases, the prototype shall be subject to the type

test; the batch production can be performed only when the test is qualified.

7.4 Sampling method

Type inspection sampling. randomly select from the inventory valves that pass

the inspection of the manufacturer, or randomly select from the valves that have

been supplied to the user but have not been used. The minimum number of

each specification of valves for sampling is 10; the number of samples is 2.

8 Signs, protection, packaging, transportation and storage

8.1 Signs

8.1.1 A permanent nameplate shall be fixed at the obvious position of the safety

valve; the nameplate shall be made of corrosion-resistant materials; the

nameplate or the outer surface of the safety valve shall have the following

contents.

8.1.2 The product number shall be a permanent sign on the valve body.

8.2 Protection

Safety valves that pass the inspection are equipped with protective covers at

the inlet and outlet and are sealed.

8.3 Packaging

8.3.1 The packing box shall be sturdy and durable. Use a reliable fixing method

to ensure that the safety valve is vertical and does not shake in the box.

8.4 Transportation

During transportation, the product shall be placed upright to avoid violent impact

and upside-down. Pay attention to rain and moisture.

8.5 Storage

The safety valve shall be stored in a clean and dry indoor environment, and

shall be stored in a box when conditions permit.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 13 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 6892 · ISO 148

Cited by

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