Pipeline grade pressure rating
Thread Content
When determining the pipe grade, must the nominal pressure of that grade be at least 1.5 times the design pressure of the medium? Is this the way to ensure the strength of the hydrostatic test? I would appreciate some guidance from experts, thank you!
I checked the standards for pipes, flanges, and valves, and indeed it’s not necessary to determine the nominal pressure of the pipes based on 1.5 times the design pressure; since both the pipes and valves are tested at a pressure of 1.5 times or more at the time of manufacture, it’s unnecessary to do so. Thank you!
It is not necessary; simply calculate based on the wall thickness, then refer to the standards to select the appropriate value. The calculated wall thickness can be verified using working hours, and generally there is no need to consider this factor. It is only when the verification of the wall thickness does not yield a valid result that it becomes necessary to increase the wall thickness