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GBT12385-2008

Chinese Standard: 'GBT12385-2008'
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GB/T 12385‐2008 
GB
ICS 23.040.60
J 15
National Standard
of the People's Republic of China
Replacing GB/T 12385-1990
Standard test method for sealability of
gaskets for pipe flanges
ISSUED ON. MAY 7, 2008
IMPLEMENTED ON. NOVEMBER 1, 2008
Issued by. State Administration for Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of China.
Table of Contents
Foreword ... 3 
1  Scope ... 4 
2  Test Method A ... 4 
3  Test method B... 8 
4  Test report ... 11 
Foreword 
This Standard is revision to GB/T 12385-1990 Standard Test Method for Sealability of
Gaskets for Pipe Flanges. Compared with GB/T 12385-1990, the main changes are as
follows.
— The applicable scope of the Standard is modified. Add the non-asbestos rubber
gaskets, rubber gaskets, Teflon gaskets. Expand or modify Teflon gaskets, flexible
graphite composite gaskets, and gaskets of serrated metal, corrugated metal
and waveform serrated metal with non-metallic coating;
— Rules and regulations are supplemented for the added gasket types, including
sample pretreatment method, gasket preload stress, test temperature, test medium
pressure and so forth;
— Referring to ASTM F112 and F37, pressure drop method is adopted for the
measurement of leakage rate in test method B. And test apparatus, test procedures
and the calculation of leakage rate are changed accordingly;
— General provisions for the key measuring instruments are added;
— Provisions for the number of tests and the test report content are added.
This standard replaces GB/T 12385-1990, from the date of implementation.
This Standard was proposed by China Machinery Industry Federation (CMIF).
This standard shall be centralized by National Pipe Accessories Standardization Technical
Committee.
Drafting organizations of this Standard. Nanjing Tech University, China Productivity Center
for Machinery (CPCFM), Zhejiang Cathay Packing & Sealing Co., Ltd., Ningbo Tiansheng
Sealing Packing Co., Ltd., Ningbo IDT Sinyuan Sealing Technology Co., Ltd., National
Non-metallic Mineral Products Quality Supervision and Inspection Center, and East China
University of Science and Technology.
The main drafters of this Standard. Gu Boqin, Li Junying, Wu Yimin, Cai Renliang, Chen
Ye, Li Xinggen, Yuan Yilin, Lei Jianbin, and Feng Mei.
Previous version of the standard replaced by this Standard are as follows.
— GB/T 12385-1990.
Standard test method for sealability of gaskets for pipe flanges
1  Scope 
This Standard specifies 2 test methods, Method A and Method B, for the sealability of
gaskets for pipe flanges.
The 2 test methods of this Standard are applicable to asbestos rubber gaskets,
non-asbestos rubber gaskets, rubber gaskets, Teflon gaskets, expanded or modified
Teflon gasket, flexible graphite composite gaskets, spiral wound gaskets, metallic clad
gaskets, Teflon clad gaskets and gaskets of serrated metal, corrugated metal
and waveform serrated metal with non-metallic coating. They are also applicable to
metallic flat gaskets.
2  Test Method A 
2.1 Test apparatus
2.1.1 The test shall be carried out on dedicated test apparatus for the comprehensive
performance of gasket. The test apparatus consists of gasket loading system, medium
supply system, leak detection system and test flanges, etc., as shown in Figure 1.
1 Standard vessel;
2 leak detection chamber;
3 Simulation flange;
8 calibration gas source;
9 Displacement sensor;
10 Load Sensor;
4 Gasket;
5 Cylinder;
6 Pressure source;
7 Test medium;
11 Pressure sensor;
12 Temperature sensor;
13 Micro-pressure sensor;
14 Data collection system.
Figure 1 Test apparatus of gasket sealability - Test method A
2.1.2 Gasket loading system shall be able to provide the required gasket preload
stress. And it can control the constant loading and unloading speed. Fluctuations of the
gasket preload stress during the test shall be within ± 2% of the specified value. When the
gasket preload stress is not greater than 35 MPa, the speed of loading and unloading is
0.2 MPa/s. When the gasket preload stress is greater than 35 MPa, the speed of loading
and unloading is 0.5 MPa/s.
2.1.3 Test medium supply system shall be able to provide the required test medium
pressure. Fluctuations of the medium pressure during the test shall be within ± 2% of the
specified......
Related standard:   GB 18384-2020  GB/T 13402-2019
   
 
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