I am currently validation on a section of pipe to be replaced
The conditions are:
1. existing pipe: OD 18¨, API 5L Gr X65, thickness 0.625¨, ca: 0.0625 ¨
2. purchased by the client pipe to be replaced: OD 18¨API 5L Gr X65, thickness 0.625 ¨, 206 bar hydrostatic test
3. Design Factor: 0.72
4. ASME B31.4

The replacement of the pipe is in the crossing of a river, because the tube is observed. It's been 27 years since it was built. The hydrologic studies indicate that the pipe must be buried 5 m from the level of the river scour
The client wants to validate the specifications and stress of the pipeline, to validate if the same material and thickness? hence the confusion
I think I can verify is the buoyancy and verify if the tube during construction is able to withstand loads the weight of the earth and the passage of heavy machinery. I'm right? Is there anything else I can do?
Thanks in advance for your feedback