LSAW steel pipes shall be subjected to hydraulic test one by one, and the test pressure shall be calculated according to the formula, the maximum pressure shall not exceed 10MPa, and shall be stabilized. The time should be more than 5s, and there should be no leakage on the pipe wall. P=2RS/D(2)

In the formula: 

P——test pressure, MPa;

R——stress, 50% of the yield point, MPa;

S——Nominal wall thickness of steel pipe, mm;

D——Nominal outer diameter of steel pipe, mm;

The supplier can replace the hydraulic test with eddy current flaw detection, and the qualification level should meet the A level in the GB/T 7735-1995 standard.

Changsha Xiangjia Metal Materical Co., Ltd. has been engaged in the  steel pipe industry over 20 years and has now become a leader in the industry. If you have any inquiry, welcome to contact us!