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- since 1996 -
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General
04:17 Nov-24-2004
UT Cal Blocks for Piping / Curved Surfaces

First I want to thank everyone who have been replying to my posts lately. It has beeen a great help for my questions.

I'm hoping someone can help me here as well.

Well dealing with piping / curved surfaces 20" diameter and less ASME V requires you to use a curved cal block and they show a diagram for it and stipulate the diameter limitations it can be used for (0.9 - 1.5 times the diametr of the cal block). My question is, what about the thickness range for the curved cal block? Do the curved blocks follow the same requirements as the non curved blocks (ie; up to one inch use a 3/4" or t thickness cal block).

I would really appreciate some input on this as I am very confused. Thanks.


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

Phil Herman Jr.

Sales, - Manufacture of NDT Reference Standards/Test Blocks
PH Tool Reference Standards,
USA,
Joined Oct 1999
79
02:17 Nov-24-2004
Re: UT Cal Blocks for Piping / Curved Surfaces
My understanding is that you need to match the wall thickness to the same schedule pipe you'll be inspecting. For example, one of your cal standards would be a 4" NPS (4.500" actual OD) with a Schedule 40 (0.237" nominal wall thickness). You would need another standard if you were inspecting a 4" NPS x Schedule 80 (.337"), or Schedule 160 (.531").

----------- Start Original Message -----------
: First I want to thank everyone who have been replying to my posts lately. It has beeen a great help for my questions.
: I'm hoping someone can help me here as well.
: Well dealing with piping / curved surfaces 20" diameter and less ASME V requires you to use a curved cal block and they show a diagram for it and stipulate the diameter limitations it can be used for (0.9 - 1.5 times the diametr of the cal block). My question is, what about the thickness range for the curved cal block? Do the curved blocks follow the same requirements as the non curved blocks (ie; up to one inch use a 3/4" or t thickness cal block).
: I would really appreciate some input on this as I am very confused. Thanks.
------------ End Original Message ------------




 
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