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If it is a regular lets say sa 106 gr b carbon steel pipe. (p1) And you do have a thickness of less than .75 inches, then normally the weld dose not have to be PWHT. However, if your WPS says you have to PWHT P1 materials, then unfortunatly you have to post weld heat treat the materials. You...

for duck 50. hydros pnue are for testing the system integrady, PIPE, WELDS, VALVES, FITTINGS, so on. If you want to test a weld, use NDT Mt, rt, ut, vt, so on. double check the Material data sheet.

i think i miss read your post. If the test was Hydro testeed, replace 1.2 with 1.5 and do the math from there. 1.2 for pnue. 1.5 for hydro.

There are seveal problems with the statement that you have made. First is the pressures, If your line was only tested to 6750psi. That means by b31.1 requirements, your maximum allowable working pressure is only 5625. Do the math, 6750/1.2 = 5625. once you tested to this pressure, and the...

You'r question is a little vauge, and i dont have a b31.3 book in front of me. However, I can say that normally when looking at working pressures in a line, you have to take into consideration what the material data sheets say the pipe can hold, what your maximum allowable working conditions...

you can determine the grade of the pipe by haivng an certified NDE tech to do a PMI (positive material identafication.) test on the pipe. Basicaly it will create a spark on the pipe, and measure the spectrum of light given off. Once the test is over, it will give you a material percentage read...