200%RT
200%RT
(OP)
is there any engineering reason or any code for 200% RT ie first RT the root pass and then RT after completion of the weld in piping?
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RE: 200%RT
I have seen it done in order to verify the integrity of the root pass prior to welding it out. No code mandate that I
am aware of.
Regards,
RLS
RE: 200%RT
RE: 200%RT
RE: 200%RT
We might also employ 200%RT for common grade CS pipe welds where someone submits an approvable golden weld hydro waiver request.
Cheers
Rob
RE: 200%RT
RE: 200%RT
is it economical to RT all welds to prevent reparing the root pass?
IMO no it's not.
fazel1 said:
isn't it better to MT or PT the root pass?
Every extra step takes time and money. Weigh it up against the benefit.
Cheers
Rob
RE: 200%RT
RE: 200%RT
This is directly related to repair costs after the job goes into service (I cannot even imagine how high a repair cost could be...millions?)
RE: 200%RT
if you want to find economical way that is better you have qulified welder & qulified welding inspector that control during welding.also if the thickness of the material is more,if you can performe PT or MT is not bad but you should be know only open surface defects specify by PT and with MT ( DC current) you can find the defects up to 1mm under surface .So 200% RT is performed for alloy steel matreials that have PWHT,first step befor heat tratemaent and second step after PWHT.
RE: 200%RT
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