Work pressure welding type: - 0. 1 - 10MPa。 The overall drilling type: - 0. 1 - 30MPa。 Along with the selected material and the use of different temperature, nominal pressure should be reasonably used as work pressure after the derating. Hydrostatic test test pressure level to protect the pipe pressure level 1. 5 times. Medium flow rate is less than 80 m/s.