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Technical Discussions
Giorgio Pozzi
Engineering
Italy, Joined Oct 2008, 1

Giorgio Pozzi

Engineering
Italy,
Joined Oct 2008
1
01:29 Oct-15-2008
Ultrasonic Standard Reference Blocks

We are using standard reference blocks to perform periodic check of our ultrasonic test instruments. These standard blocks are built according to ASTM E127 and ASTM E317 standards. My question is about the period of validity of this kind of blocks. I would like to know if there is any standard which establishes a period of time for the life of these blocks and the actions to be perfomed at the end of this period such as a verification of the block or purchasing of a new one.
Thank you for your help.


 
 Reply 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
04:51 Oct-15-2008
Re: Ultrasonic Standard Reference Blocks
As one of the companies that sell such blocks, we do not set any time limit on their use, and I am not aware of any standard that calls for recertification although perhaps some customers have established their own. Since the block certification is based on the quality of the metal used and the geometry of the drilled reference hole, there is nothing that will change over time, at least on a human scale! Flat bottom hole reference blocks will last for decades if you treat them gently. The only plausible way in which they could vary over time would be due to severe wear on the coupling surface, which should not happen in normal use. If a block was damaged by rough treatment, it would be visible to the eye, and in such cases the block should probably be retired.




 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 891

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
891
08:17 Oct-15-2008
Re: Ultrasonic Standard Reference Blocks
Tom,

You've hit the nail on the head. Throughout my career, I've seen so many shop where these blocks have been abused. The things that just floor me is that I grew up in NDT with the notion the cleanliness was next to Godliness and as such, to treat your tools with respect. The end results of our inspection depend greatly in the quality and accuracy that we start with. And to think that technician don't understand why sometimes employer are reluctant to give them a better rate of pay!!! Now we know why (not true in all cases, but surely in many). In the end someone has to pay for this and where is it come from?

Cherrio's

Michel

----------- Start Original Message -----------
: As one of the companies that sell such blocks, we do not set any time limit on their use, and I am not aware of any standard that calls for recertification although perhaps some customers have established their own. Since the block certification is based on the quality of the metal used and the geometry of the drilledreference hole, there is nothing that will change over time, at least on a human scale! Flat bottom hole reference blocks will last for decades if you treat them gently. The only plausible way in which they could vary over time would be due to severe wear on the coupling surface, which should not happen in normal use. If a block was damaged by rough treatment, it would be visible to the eye, and in such cases the block should probably be retired.
------------ End Original Message ------------




 
 Reply 
 
Navita Gupta
Navita Gupta
00:20 Oct-16-2008
Re: Ultrasonic Standard Reference Blocks
Dear Giorgio Pozzi
As long as your reference calibration blocks give you standard results with calibrated equipments, you can keep using the same reference blocks.
Navita
----------- Start Original Message -----------
: We are using standard reference blocks to perform periodic check of our ultrasonic test instruments. These standard blocks are built according to ASTM E127 and ASTM E317 standards. My question is about the period of validity of this kind of blocks. I would like to know if there is any standard which establishes a period of time for the life of these blocks and the actions to be perfomed at the end of this period such as a verification of the block or purchasing of a new one.
: Thank you for your help.
------------ End Original Message ------------




 
 Reply 
 

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