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- since 1996 -

Sonatest Ltd
From our three distinct business centres in the UK, USA and CANADA, Sonatest design and produce a leading range of high performance ultrasonic NDT equipment and accessories.
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Technical Discussions
Peter
Singapore, Joined Jan 2012, 119

Peter

Singapore,
Joined Jan 2012
119
03:23 Aug-01-2013
MPI YOKE CALIBRATION

Dear All,

Is there any requirement in ASME saying that we need to calibrate the MT yoke yearly? I am unable to find such statement. Is it sufficeint just to perform in-house calibration yearly using lifting block whereby the lifting block will be calibrate yearly. Is that sufficient?


Peter

 
 Reply 
 
Keith Cain
NDT Inspector, ASNT Level 3
Chimaera Inspection Services, South Africa, Joined Jan 2009, 17

Keith Cain

NDT Inspector, ASNT Level 3
Chimaera Inspection Services,
South Africa,
Joined Jan 2009
17
11:06 Aug-01-2013
Re: MPI YOKE CALIBRATION
In Reply to Peter at 03:23 Aug-01-2013 (Opening).

Hi Peter

Have a look at ASME Section V 2010 - Article 7 Para. T-762.

The four sub-paragraphs state what is required.

Regards,

Keith

 
 Reply 
 
Dent
Consultant, NDE Manager NDELevel III/3
NDT Consultant, Canada, Joined Nov 1998, 248

Dent

Consultant, NDE Manager NDELevel III/3
NDT Consultant,
Canada,
Joined Nov 1998
248
21:41 Aug-01-2013
Re: MPI YOKE CALIBRATION
In Reply to Keith Cain at 11:06 Aug-01-2013 .

Remember Code is minimum. Most companies I deal with calibrate monthly or every 3 months. Since yokes have become lighter they are also less forgiving when it comes to wear and tear with use. I have tested a new one that barely lifted the weight straight out of the box.
If a yoke fails calibration and it has been 1 year since it was last calibrated you have a lot of work that is now in question. For the little time it takes to lift the weight it is well worth doing it more often.

What is more concerning is the pole spacing being used must not exceed the spacing used when calibrating.
Also the use of a pie gauge is not permitted by ASME to prove the field strength with a yoke.

 
 Reply 
 
Gerald R. Reams
Engineering,
Industry, USA, Joined Aug 2012, 181

Gerald R. Reams

Engineering,
Industry,
USA,
Joined Aug 2012
181
22:42 Aug-01-2013
Re: MPI YOKE CALIBRATION
In Reply to Dent at 21:41 Aug-01-2013 .

I perform frequent checks but only document on an annual basis. I record the lift weight at the maximum pole spacing able to lift the weight.

Regards,
Gerald

 
 Reply 
 
Tyler
NDT Inspector,
GE Inspection Technologies , USA, Joined May 2011, 24

Tyler

NDT Inspector,
GE Inspection Technologies ,
USA,
Joined May 2011
24
22:46 Aug-01-2013
Re: MPI YOKE CALIBRATION
In Reply to Peter at 03:23 Aug-01-2013 (Opening).

Like Keith has stated:

T-762:
(a) Prior to use, the magnetizing power of electromagnetic
yokes shall have been checked within the past year.
The magnetizing power of permanent magnetic yokes shall
be checked daily prior to use. The magnetizing power of
all yokes shall be checked whenever the yoke has been
damaged or repaired.

We implement the lifting power of yokes to be performed prior and after use, for every examination.

Dent's explanation is the reason we perform pre & post lifts.

 
 Reply 
 
Dan Caracas
Dan Caracas
15:10 May-02-2016
Re: MPI YOKE CALIBRATION
In Reply to Tyler at 22:46 Aug-01-2013 .

ASME Code ed 2015
I believe this ''problem'' is solved now. See please Section V, Art 7, Para T-762.

 
 Reply 
 
Shankar Arumugam
Other, NDE Engineer
India, Joined Oct 2013, 39

Shankar Arumugam

Other, NDE Engineer
India,
Joined Oct 2013
39
11:38 May-03-2016
Re: MPI YOKE CALIBRATION
In Reply to Peter at 03:23 Aug-01-2013 (Opening).

As per 2015 Edition of ASME Sec-V, T- 762, "the magnetizing power of yokes (calibration) shall be verified prior to use each day the yoke is used. The magnetizing power of yokes shall be verified whenever yoke has been damaged or repaired". So we need to check the magnetizing power (calibration) everyday prior to use of the yoke.

 
 Reply 
 

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