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UT on structural pipe under 24" per AWS D1.1 2015

UT on structural pipe under 24" per AWS D1.1 2015

UT on structural pipe under 24" per AWS D1.1 2015

Question: When it comes to performing UT testing on CJP welds over 5/16" thick on pipe splices or pipe to base plates or even T,K,Y, everyone I have ever met has always stated when the pipe is under 24" conventional calibration and test methods are out the window and calibration standards must be machined from the same material you are scanning on.

D1.1 2015 states

9.27.1 Amplitude based acceptance
criteria as given by 6.13.1 may also be used for groove
welds in butt joints in tubing 24 in [600 mm] in diameter
and over, provided all relevant provisions of Clause 6,
Part F, are followed. However, these amplitude criteria
shall not be applied to tubular T, Y-, and K-connections.

If you refer to ASTM E164 it shows curved shoes a required under 20" pipe, however D1.1 only refers to ASTM E164 in regards to calibration blocks acceptable for use, and I assume we cannot use ASTM E164 for reference beyond that unless it is stated in the procedure you are using.

My biggest question is when it comes to performing UT on tubing under 24" D1.1 doesn't clearly state the type of calibration standard to be used for pipe to pipe and pipe to plate welded connections it does though for T,K,Y. In ASME section 5 it states a calibration standard must be made from the same material you are scanning on or you can use a set of curved calibration blocks for a range of diameters. I am on the brink of purchasing these blocks from PH tool for a range of pipe diameters in accordance with ASME Section V, however I want to be sure that we are able to use them for this structural application. I do know that if we write a procedure for these calibration blocks from our level III then we should cover all grounds.

I guess I am looking to see what everyone else has done in this situation when you have pipe under 24" on a Structural D1.1 or D1.8 classified job with pipe to pipe and pipe to base plate connections. Do you machine calibration blocks from the material? Have you considered the ASME curved block set? I do know that you you should write a procedure from your level III etc etc, I just want to see how everyone else has tackled this situation and what steps you took in order to perform the UT on pipe under 24"

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