1. The overview and the experiment preparation:

 

The purpose of this procedure is to describe and guidance to the maximum operating pressure leak test (MOP) test methods.

2. The test medium: the nitrogen as the test medium.

3. Steps:

1) under the stable, controlled way gradually step up in 2 bar or design pressure (with lower accurate) holding 10% of the 10 min.

2) the pressure should be gradually rise to test, with 25%, 50%, 75%, 100% increment to the final test pressure.

3) the holding four hours, all the joint, flange when the holding for leak detection.

4) after the repair according to the same procedure to check again. Against revisionism region after acceptance in accordance with the standards of the same.

5) pressure relief slowly, and then pressure release completely.

4. The pressure test equipment