Pipeline pressure testing requirements and procedures

Pressure Testing Requirements

System Isolation: During pipeline pressure testing, all equipment and pipelines that cannot participate in the test must be properly isolated from the system. If isolation is not possible, the equipment must be approved by the design and construction units before it can be included in the system pressure test.

Test Pressure: The test pressure for the entire system should be based on the highest design pressure of the pipelines within the same grade system. Pipelines with different pressure ratings should not be tested together in series.

Pipeline Pressure Testing

Pipeline and Equipment Testing: When pipelines and equipment are tested as a single system, the approval of the construction/supervisory and design units is required. The following conditions must be met:

a) If the pipeline test pressure is less than or equal to the equipment test pressure, the test should be conducted at the pipeline test pressure.

b) If the pipeline test pressure exceeds the equipment test pressure and the equipment cannot be isolated, the test should be conducted at the equipment test pressure, provided that the equipment test pressure is at least 77% of the pipeline test pressure.

Pressure Testing Process

Before conducting pressure tests on pipelines, a necessary inspection of the welded pipelines must be performed. Only after passing this inspection can pressure testing proceed. The pressure testing process is illustrated in the following diagram:

Pressure Testing Process

By adhering to these requirements and procedures, pipeline pressure testing can be conducted safely and effectively, ensuring the integrity and reliability of the piping system.