Pipeline hydrostatic test

[A.I.H]

thread378-417369
I need your help
I have agas pipeline with 27 km length 36". The test pressures will be 125 bar. The pipeline has a various elevation a long it.and I need to make a test sections for it.
1 what is the max elevation allowable in each section?
2 The max elevation will be between the first and the end point or along the section?

 

[LittleInch]

You need to read that previous post carefully. All your questions are answered there.

1) It's not max elevation that's the problem, but difference between bigness and lowest point in any section.

That difference will depend on many things including the test pressure required at the highest point, the pressure at the lowest point which equates to 95% SMYS based on your minimum walk thickness and the elevation difference

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[zdas04]

You might want to take a few minutes and watch the Video in the link. The ultimate risk of filling a 27 km, 36 inch line with water and pressurizing it to 125 bar is several orders of magnitude higher than the risk of doing the same test with air or nitrogen. Over 27 km it is pretty common for the terrain features to exceed 100 m which is a 10 bar difference in pressure, so if you put your gauge at a high point, the low point will exceed your test pressure by about 8%. If you put it a the low point the high points will be under pressured by about 8% and might not be above MAWP (depending on your test multiplier) which should derate your line by a pressure class. Watch the video.

[bold]David Simpson, PE[/bold]
MuleShoe Engineering

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist