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- since 1996 -
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Technical Discussions
Adam
Adam
23:56 Sep-03-2015
Piping calibration blocks

ASME Section V says:

T-434.1.7 Block Curvature
T-434.1.7.1 Materials With Diameters Greater
Than 20 in. (500 mm). For examinations in materials
where the examination surface diameter is greater than
20 in. (500 mm), a block of essentially the same curvature,
or alternatively, a flat basic calibration block, may be used.

The question is, a curved piping calibration block has a notch depth of .07-.11T. A Non-Piping calibration block is .02T. The customer essentially gets a MUCH higher sensitivity in their inspection if a piping block of "essentially the same curvature" cannot be made, and a "basic flat block" is used? Why couldnt one just create a flat block with the same notch depth as the curved standard in this case? The difference between the two would be of little significance?

 
 Reply 
 
Philippe Rioux
R & D, Sonatest
Sonatest, Canada, Joined Jan 2015, 37

Philippe Rioux

R & D, Sonatest
Sonatest,
Canada,
Joined Jan 2015
37
13:05 Sep-04-2015
Re: Piping calibration blocks
In Reply to Adam at 23:56 Sep-03-2015 (Opening).

Hi,
ASME also says :
Piping Calibration Blocks. The basic calibration block configuration and reflectors shall be as shown in Fig. T-434.3. The basic calibration block shall be a SECTION of pipe of the same nominal size and schedule. The block size and reflector locations shall be adequate to perform calibration for the beam angles used.

Good Luck,

 
 Reply 
 
Phil Herman
Sales, - Manufacture of NDT Reference Standards/Test Blocks
PH Tool Reference Standards, USA, Joined Oct 1999, 79

Phil Herman

Sales, - Manufacture of NDT Reference Standards/Test Blocks
PH Tool Reference Standards,
USA,
Joined Oct 1999
79
14:41 Sep-04-2015
Re: Piping calibration blocks
In Reply to Adam at 23:56 Sep-03-2015 (Opening).

Adam, as a manufacturer of these UT blocks, we do exactly as you described when a client prefers a flat block for diameters over 20". Start with a flat plate and machine the 10% deep reflectors.
Good luck.
Phil Herman
PH Tool Reference Standards

 
 Reply 
 
Anmol Biring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 785

Anmol Biring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
785
02:45 Sep-14-2015
Re: Piping calibration blocks
In Reply to Adam at 23:56 Sep-03-2015 (Opening).

Piping calibration blocks are shown in ASME V (2013) Article 4 T-434.3-1 or T-434.3-2.

 
 Reply 
 

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