Ansi B31.3 Piping
Ansi B31.3 Piping
(OP)
Normal practice is to radiograph pipe butt welds prior to hydrotesting. Is this a defined requirement as per Ansi B31.3 or is it as a general safety issue only?
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RE: Ansi B31.3 Piping
If the piping is designed and installed per the ASME B31.3 Code, then there are examinations and leak tests required. For some other code besides B31.3 there may be other exam and test requirements. Most of the B31.3 fluid services will get a 5% random radiography of welds and a hydrostatic leak test. You want to do the radiography prior to hydro, so that any repairs to radiographed welds don't get you into another hydrotest of the complete piping system.
This is common sense, but the B31.3 Code states in Para.345.1 "Prior to initial operation, and AFTER (my caps) completion of the applicable examinations required by par. 341, each piping system shall be tested to ensure tightness. The test shall be a hydrostatic leak test in accordance with para. 345.4 except as provided herein."
RE: Ansi B31.3 Piping
There are other methods of examination, dye penetrant, ultrasonic, magnetic particle etc. Dont forget the good lod visual examination of a weld. You can pick porosity, undercut etc from this alone. If you observe the welders preparing the weld, and every apss you will soon get to see which welds will be dodgy.
the highe rthe level of inspection the greater the cost but the better you will sleep at night.
RE: Ansi B31.3 Piping
RE: Ansi B31.3 Piping
So not only is it good practice, it's required.
Donf
RE: Ansi B31.3 Piping
I will suggest you to read at least the whole paragraph 3.41.4
I hope this leads you on the right direction.