GB/T 12621-2008 English PDF

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GB/T 12621-2008: Standard test method for stress relaxation of gaskets for pipe flanges
Status: Valid

GB/T 12621: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 12621-2008	299	Add to Cart	3 days	Standard test method for stress relaxation of gaskets for pipe flanges	Valid
GB/T 12621-1990	479	Add to Cart	4 days	Test method for stress relaxation of gaskets for pipe flanges	Obsolete

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GB/T 12385   GB/T 9125.2   GB/T 13401   GB/T 45182   GB/T 12622   

Basic data

Standard ID: GB/T 12621-2008 (GB/T12621-2008)
Description (Translated English): Standard test method for stress relaxation of gaskets for pipe flanges
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J15
Classification of International Standard: 23.040.60
Word Count Estimation: 13,166
Date of Issue: 2008-05-07
Date of Implementation: 2008-11-01
Older Standard (superseded by this standard): GB/T 12621-1990
Regulation (derived from): National Standard Approval Announcement 2008 No.7 (Total No.120)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the pipe flange gasket stress relaxation A, B two test methods. A test method applies to asbestos rubber gasket, non- asbestos rubber gasket, PTFE gasket, expansion or modified PTFE gasket, flexible graphite composite gasket. Test Method B is suitable for spiral wound gasket, metal jacketed gaskets, teflon coated pads, with toothed metal and nonmetal cover layer, corrugated metal and wave toothed metal gasket. The method is also applicable to Test Method A applies gasket, metal gasket can be conducted with reference to the level of the method.

GB/T 12621-2008: Standard test method for stress relaxation of gaskets for pipe flanges

---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.
Standard test method for stress relaxation of gaskets for pipe flanges ICS 23.040.60 J15 National Standards of People's Republic of China Replacing GB/T 12621-1990 Pipe flange gasket stress relaxation test methods Posted 2008-05-07 2008-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is GB/T 12621-1990 "pipe flange gasket stress relaxation test method" amendment, and GB/T 12621-1990 Compared to the main changes are as follows. --- The scope of the standard was amended to increase the non-asbestos rubber gasket, PTFE gasket, expanded or modified polytetrafluoroethylene Ene gaskets, flexible graphite gaskets, non-metallic coating layer having a toothed metal, corrugated metal and metal gasket wave tooth; --- Test Method A, the strip specimens from the original sample to sample a ring; --- Test Method B, with respect to the increase in the gasket type, the corresponding increase in supplementary test load and test temperature and so forth; --- Increased the number of tests and test content reporting requirements. The Standard Annexes A and B are normative appendix. From the date of implementation of this standard, instead of the GB/T 12621-1990. The standard proposed by China Machinery Industry Federation. This standard by the National Standardization Technical Committee pipe accessories. This standard was drafted. Nanjing University of Technology, the machine Productivity Promotion Center, Zhejiang Cathay Pacific sealing materials Co., Ltd., Ningbo-day To Xinyuan Sealing Technology Co., Ltd., Ningbo born seals Limited, National Non-metallic mineral products Quality Supervision and Inspection Center, CHINA the University. The main drafters of this standard. Gu Boqin, Li Junying, Wu Yimin, Cairen Liang, Yuan Yilin, Li root row, Chen Ye, Mei Feng, Lei Jianbin. This standard replaces the standards previously issued as follows. --- GB/T 12621-1990. Pipe flange gasket stress relaxation test methods

1 Scope

This standard specifies the pipe flange gasket stress relaxation of the A, B two test methods. Test Method A suitable asbestos rubber gasket, non-asbestos rubber gasket, PTFE gasket, expanded or modified polytetrafluoroethylene pad Sheet, flexible graphite gasket. Test Method B is suitable for spiral wound gasket, metal jacketed gasket, PTFE-coated gaskets, non-metallic coating layer having a gold tooth Genera, and corrugated metal gasket metal wave tooth. This method also applies to Test Method A applies gasket, metal flat gasket may also refer to This method.

2 Test Method A

2.1 Test apparatus Test on a dedicated stress relaxation test apparatus, device consists of upper and lower circular plate, center bolt, push rod, washers, nuts and dial gauge And its components and other components, as shown in Fig. Upper and lower circular plate, center bolt, push rod, washers and nuts or performance therewith shall 42CrMo When the material. Calibration central bolt in accordance with Appendix A requirements. 1 --- up and down round plate; 2 --- center bolt; 3 --- dial gauge components (including connection sleeve, the plunger and fixing screws); 4 --- dial gauge; 5 --- nuts; 6 --- washers; 7 --- samples. Figure 1 is applied to the gasket stress Test Method A relaxation test apparatus ......

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