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GB/T 45182-2025 English PDF

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GB/T 45182-2025: Test procedures of gasket parameters based on leakage rate for the pipe flange joints
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GB/T 45182-2025English519 Add to Cart 5 days [Need to translate] Test procedures of gasket parameters based on leakage rate for the pipe flange joints Valid GB/T 45182-2025

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Basic data

Standard ID GB/T 45182-2025 (GB/T45182-2025)
Description (Translated English) Test procedures of gasket parameters based on leakage rate for the pipe flange joints
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard J15
Classification of International Standard 23.040.60
Word Count Estimation 26,237
Date of Issue 2025-01-24
Date of Implementation 2025-08-01
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 45182-2025: Test procedures of gasket parameters based on leakage rate for the pipe flange joints


---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 23.040.60 CCSJ15 National Standard of the People's Republic of China Gasket parameter test method for pipe flange based on leakage rate flangejoints Released on 2025-01-24 2025-08-01 Implementation State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 General requirements for testing 2 5 Sample 2 6 Test conditions 3 7 Determination of the maximum allowable stress Qsmax and the unloading elastic modulus EG of the gasket 3 8 Determination of creep relaxation factor PQR and creep amount ΔeGC 7 9 Determination of the minimum gasket assembly stress Qmin(L) and the minimum gasket working stress Qsmin(L) 7 10 Determination of axial thermal expansion coefficient αG10 11 Determination of static friction coefficient μG 10 12 Test Report 10 Appendix A (Informative) General Test Bench 12 Appendix B (informative) Compression, compression creep and creep relaxation test module 13 Appendix C (Informative) Room temperature leak test module 14 Appendix D (Informative) Leak test bench allowing the use of replaceable pressure plates 15 Appendix E (Normative) Determination of sealing performance of strip gaskets 16 Appendix F (Informative) Test bench for simulating the minimum working stress Qsmin (L) of gaskets under long-term high temperature 17 Appendix G (Informative) Recommended method for determining the static friction coefficient μG of gaskets 18 References 20

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Machinery Industry Federation. This document is under the jurisdiction of the National Technical Committee for Standardization of Pipeline Accessories (SAC/TC237). This document was drafted by. China Machinery Productivity Promotion Center Co., Ltd., East China University of Science and Technology, Zhejiang Guotai Xiaoxing Sealing Materials Co., Ltd. Company, Ningbo Tiansheng Sealing Co., Ltd., Jiangsu Special Equipment Safety Supervision and Inspection Institute, Sinopec Engineering Construction Co., Ltd., China Tianchen Engineering Co., Ltd., PetroChina East China Design Institute Co., Ltd., Ningbo Yitiandi Xinyuan Sealing Technology Co., Ltd., Guangzhou Dongshan Nanfang Seals Co., Ltd., Ningbo Labor Safety Technology Service Co., Ltd., Taizhou Longjiang Chemical Machinery Technology Co., Ltd., China Electric Power Science Research Institute Co., Ltd., Yanqi Lake Basic Manufacturing Technology Research Institute (Beijing) Co., Ltd. The main drafters of this document are. Zhang Lanzhu, Wu Yimin, Feng Feng, Li Xinggen, Lin Jianhong, Li Ke, Zhao Yong, He Hua, Liu Hongfu, Liu Jianxin, Wu Kaijun, Xiong Conggui, Chai Junhui, Gu Ke, and Wang Xiaojuan. Gasket parameter test method for pipe flange based on leakage rate

1 Scope

This document describes the test methods and test procedures for gasket parameters, including the maximum allowable stress Qsmax, unloading elastic modulus EG, creep Variable relaxation factor PQR, creep amount ΔeGC, minimum gasket assembly stress Qmin(L), minimum gasket working stress Qsmin(L), axial thermal expansion coefficient αG and static friction coefficient μG. This document is applicable to parameter testing of non-metallic flat gaskets (except rubber gaskets), semi-metallic gaskets and metal gaskets, and other shapes and sizes. Gaskets can also be used for reference.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 9124.1 Steel pipe flanges Part 1.PN series GB/T 9124.2 Steel pipe flanges Part 2.Class series

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Maximum allowable gasket stress The maximum stress that can be applied to the gasket at a specified temperature without causing collapse, rupture, compression failure or damage to the pressure surface. 3.2 Qmin(L) When installing the gasket at room temperature, the minimum gasket stress required to ensure that the sealing level between the flange faces reaches L under the test internal pressure. 3.3 Qsmin(L) The minimum gasket stress required to maintain sealing level L under test conditions (temperature and internal pressure). 3.4 Sealing level tightnessclass Different leak rate ranges or maximum values for defined leak rates. 3.5 PQR Characterizes the stress relaxation characteristics of gaskets exposed to test temperature for a long time, expressed as the ratio of residual gasket stress to initial gasket stress.

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