Precautions for Seamless Line Pipe Production Process

 　　Precautions for seamless line pipe production process:

　　1. Raw material inspection and inspection

　　The raw material manufacturer's product quality certificate, the raw material is sampled in batches, and the steel pipe manufacturer will conduct various inspections and issue an inspection report.

　　2. Hydrostatic pressure test

　　Each steel pipe shall be subjected to hydrostatic pressure test without leakage, and the test pressure shall be at least not lower than the requirements in API 5L. The test pressure holding time for seamless steel pipes of various sizes shall be no less than 5 seconds. In order to ensure that each steel pipe can reach the required test pressure, each testing machine should be equipped with a recorder to record the test pressure and holding time of each steel pipe. If there is a representative of the purchaser in the factory for inspection, these records or charts should be available for inspection by the inspector of the purchaser. The test pressure test device is checked every 4 months. The storage of verification records shall comply with the provisions of the API 5L standard.

　　3. Non-destructive testing

　　For all seamless steel pipes, non-destructive inspection should be carried out in accordance with the provisions of the API 5L standard.

　　4. Tensile test

　　A complete tensile test should include the determination of yield strength, ultimate tensile strength and elongation.

　　5. Non-destructive testing

　　For all seamless steel pipes, non-destructive inspection should be carried out in accordance with the provisions of the API 5L stand

　　6. Tensile test

　　A complete tensile test should include the determination of yield strength, ultimate tensile strength and elongation.

　　7. Charpy impact test

　　Charpy impact test is not required for PSL1 products;

　　Charpy impact test of PSL2 is sampling test according to API 5L standard.

　　8. Appearance and surface inspection

　　There should be no cracks, folds, folds, scars and delamination on the inner and outer surfaces of the steel pipe, and these defects should be completely removed. The cleaning depth should not exceed the negative deviation of the nominal wall thickness, and the actual wall thickness at the cleaning site should not be less than the minimum allowable wall thickness deviation.

　　On the inner and outer surface of the steel pipe, the allowable depth of the straight line is as follows:

　　Cold drawn steel pipe: not more than 4% of the wall thickness, and the maximum depth is 0.3mm;

　　Hot-rolled steel pipe: not more than 5% of the wall thickness, and the maximum depth is 0.5mm.

　　Other local defects that do not exceed the negative deviation of the wall thickness are allowed to exist.

　　http://www.xysteelpipe.com/info/Precautions-for-Seamless-Line-Pipe-Production-Process-1975-1.htm

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