In addition to the welding connection, the Chongqing flange connection is also widely used in the connection of pressure pipelines. The number of bolts in the Chongqing flange is large and the working condition is complex. In recent years, the leakage accidents caused by flange interfaces have been increasing, causing great harm to the operation of the device. About 18% of all leakage accidents are caused by flange joint leakage. Therefore, it is particularly important to control flange installation quality and strengthen flange management.

First, let's analyze the causes of flange leakage. There are many reasons for flange leakage, and the main reasons for flange leakage in the construction stage are as follows:　

1) Flange, gasket, and other sealing surface damage;

2) Materials such as gaskets or bolts are used incorrectly, which cannot meet the operating conditions of pipeline operation;

3) Flange deflection causes leakage;

4) Gasket damage caused by non-standard fastening;

5) Due to insufficient fastening load, the gasket can not achieve sealing performance;

6) Due to excessive fastening load, the Chongqing gasket rot.

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