According to the national standard, straight seam steel pipe should be 100% for hydraulic pressure test before delivery. Different specifications of the straight seam steel pipe, straight seam steel pipe of different standard in testing the hydraulic test pressure is different. Now for the low pressure fluid conveying high frequency straight seam steel pipe and straight seam welding resistance welded pipe as an example, detailed instructions on straight seam welded pipe test pressure calculation and related regulations.

According to the provisions of GB/T3091-2008 standards, under this standard of welded pipe shall be carried out by root pressure test, the test pressure according to the calculated formula of P/D = 2 st. In which P said the minimum test pressure steel pipe; S steel yield strength under 60% of the unit is Newton per square millimeter; D said steel tube diameter, the unit is mm; T said steel pipe wall thickness, the unit is mm. In the experiment, calculating the water pressure value to the nea