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GB/T 29026-2012 PDF English


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GB/T 29026-2012: PDF in English (GBT 29026-2012)

GB/T 29026-2012 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 13.240 J 16 Spring loaded safety valve for cryogenic service (BS EN 13648-1:2008, Cryogenic vessels - Safety devices for protection against excessive pressure - Part 1: Safety valves for cryogenic service, NEQ) ISSUED ON: DECEMBER 31, 2012 IMPLEMENTED ON: OCTOBER 01, 2013 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People’s Republic of China. Table of Contents 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  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 GB/T 12241, Safety valves - General requirements (GB/T 12241-2005, ISO 4126-1:1991, MOD) GB/T 12242, Performance test code - Pressure relief devices (GB/T 12242- 2005, ASMEPTC 25:1994, MOD) GB/T 12243, Spring loaded safety valves (GB/T 12243-2005, JISB 8210:1994, MOD) JB/T 2203, Structural length of spring type safety valve Notes: 1 -- valve seat; 2 -- valve body; 3 -- positioning screw; 4 -- positioning rod; 5 -- adjusting ring; 6 -- valve flap; 7 -- disc holder; 8 -- guide sleeve; 9 -- bellows; 10 -- isolation cavity; 11 -- spring; 12 -- valve cover; 13 -- valve stem; 14 -- adjusting screw; 15 -- bonnet. Figure 1 -- Typical structural form of cryogenic safety valve 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 5.2.1 Design temperature The safety valve shall work normally between the required minimum operating temperature and +65 °C. 5.2.2 Drain Regardless of the outlet connection, the design or installation of the safety valve shall avoid the accumulation of liquid in the valve. 5.2.3 Guide device The guide device shall be designed to avoid malfunctions due to the deposition and condensation of humid gases in the valve in the normal operation of the valve. The guide device of the valve shall be reliable and shall not be affected by normal handling. 5.2.4 Valve body The safety valve shall be designed to avoid the accumulation of solid substances in the valve body or the outlet, which will cause the valve to 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. 5.3.2.3 When the working medium is oxygen or has oxidizing properties, the safety valve material shall have compatibility with oxygen. 5.3.2.4 If the mixed medium contain acetylene, the copper content in the metallic material shall not exceed 70%. 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. 5.3.3.2 Non-metallic materials are generally used at the valve flap or valve seat, so as to enhance the tightness when the valve is closed. 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 5.6.1 Valve body strength The safety valve shall ensure normal work under operating conditions; no harmful deformation shall occur under the valve body strength test and operating conditions. 5.6.2 Motion performance The set pressure deviation, discharge pressure, opening height, opening and closing pressure difference of the safety valve shall meet the requirements of GB/T 12243. 5.6.3 Sealing performance The sealing performance of the safety valve shall meet the requirements of GB/T 12243. each specification of valves for sampling is 10; the number of samples is 2. When the user samples, the number of samples for sampling is not limited; the number of samples is still 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: a) safety valve manufacturing license number and sign; b) name of the manufacture company; c) safety valve type; d) the date of manufacture and its product number; e) nominal pressure; f) nominal size; g) flow diameter or flow area; h) set pressure; i) valve body material; j) minimum operating temperature; k) rated displacement factor or rated capacity that is guaranteed for a certain fluid. 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 ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.