Tests conducted on API 5L ERW pipe mainly include the following:
Tensile performance test: Straight welded casing pipes shall be subjected to base metal and weld tensile tests for each batch according to the standard. The yield strength, tensile strength, elongation of the longitudinal and transverse base metals and the tensile strength of the transverse welds shall meet the standard requirements. Specifically, the longitudinal base metal tensile specimen shall be cut at a 90° position with the weld.
Charpy V-notch impact test: The Charpy impact energy of the longitudinal and transverse base metals and transverse welds of straight welded casing pipes shall meet the standard requirements. One pipe shall be drawn from a batch of pipes, and three impact specimens shall be taken from the same part for testing. Visually visible defects such as gray spots are not allowed on the fracture of the impact specimens.
Chemical composition analysis: The chemical composition of ERW steel pipes shall meet the standard requirements. The steel samples used in the pipeline shall be carefully checked to determine whether they meet the chemical composition specified in the API 5L standard. Including the content limits of carbon, manganese, silicon, phosphorus, sulfur and other elements. The smelting analysis and finished product analysis of each batch shall not exceed the range specified by the standard.
Hydrostatic test: Before leaving the factory, ERW steel pipes usually need to undergo hydrostatic testing to ensure that their pressure bearing capacity and sealing meet the standard.
Nondestructive testing: Among these methods, ultrasonic testing is a common technology for evaluating ERW pipes. The procedure requires high-frequency sound waves to be transmitted through the pipe wall, followed by reflection analysis to detect potential internal defects. In addition to ultrasonic testing, radiographic testing is another important nondestructive testing method for evaluating API 5L ERW pipes. By using X-rays or gamma rays, radiographic testing can generate images of the internal structure of the pipe.
high temperature welded pipe
