While the standard testing requirements outlined in the API 5L specification apply to PSL1 and PSL2 pipelines, the PSL2 classification also comes with additional testing requirements to further ensure the quality and suitability of the pipeline for critical applications. These additional and common tests include:
Chemical composition control: PSL2 requires stricter chemical composition control than PSL1, including higher purity and lower content of unfavorable elements.
Mechanical properties: PSL2 has higher requirements in terms of tensile properties, impact resistance, etc. to avoid brittle fracture. In addition, PSL2 also has higher requirements for tensile strength and yield strength.
Non-destructive testing: PSL2 requires non-destructive testing of each pipe to ensure the safety and integrity of the pipeline. Specific testing methods may include radiographic testing, ultrasonic testing, etc..
Hydrostatic testing: PSL2 requires hydrostatic testing of each pipe, and non-destructive testing cannot be used instead of hydrostatic testing.
Pipe End Treatment: The pipe ends of PSL2 require sandblasting to ensure welding quality and reduce corrosion risks
Low Temperature CVN Impact Test: This test evaluates the impact resistance of the pipeline at low temperatures (usually as low as -40°C (-40°F) or lower) to ensure the performance of the pipeline during operation in cold climates or winter.
Weldability Test: This evaluation evaluates the ability of the pipeline to be welded without affecting its mechanical properties, ensuring the integrity of the welded joint.
Hardness Test: This test measures the surface hardness of the pipeline, which is important for resisting wear, abrasion and deformation during installation and operation.
Drop Weight Tear Test (DWTT): This test measures the pipeline's resistance to brittle fracture, which is critical to ensuring the integrity of the pipeline in high-pressure, high-stress applications.
API 5L PSL2 X60 pipe line
