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　　(1) Geometric dimension inspection of seamless welded steel pipe outer diameter, wall thickness, bending degree and length can be inspected by external caliper, micrometer, bending relief ruler and length tape ruler on the inspection table.

　　(2) Visual inspection is generally used to inspect the inner and outer surfaces of seamless welded steel pipe, and besides visual inspection, reflection prism can also be used to inspect the inner surfaces of seamless welded steel pipe. Some special purpose seamless welded steel pipe also require non-destructive testing, including eddy current, magnetic flux leakage, ultrasonic, magnetic particle testing, etc. to inspect the internal and external surface quality of seamless welded steel pipe.

　　(3) In order to verify that the mechanical properties of API 5CT PSL2 Seamless Welded Steel Pipe meet the requirements of the standards, it is necessary to test the mechanical properties of seamless welded steel pipe by sampling.

　　(4) Non-destructive testing (NDT) refers to the direct inspection of internal and surface defects of seamless welded steel pipe without damaging them. At present, magnetic flux leakage testing, ultrasonic testing, eddy current and fluorescent magnetic particle testing have been widely used in seamless welded steel pipe enterprises. In recent years, non-destructive testing has made great progress. Recently, new technologies such as acoustic emission holography, ultrasonic spectrum analysis, ultrasonic imaging and high temperature ultrasonic testing have emerged. Insiders of China Seamless Pipeline Network have learned.

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