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Technical Discussions
20:52 Aug-09-2010

S.Senthilkumar

Engineering, QA/QC/NDT,
NOV (National Oilwell Varco),
Angola,
Joined Mar 2006
35
702 views
UT Equipment Calibration Doubt on TH Hill Standard.
Dear All,
Good Morning,

I have been reading the DS-1 Standard 2005 3rd Ed. In that have an doubt regarding the UT on Connections, Field Mandatory Page no: 45
Every time turnned on Equipment shall be sensitivity Calibration? I want to under standard correctly. Why this requirment different from other standards?
If I am working with UT Equipment continous Power supply then while starting and end of my shift I have to do. Is it right.
I am working in OCTG NDT Company.

Please clear my doubt.
 
 
04:36 Aug-10-2010

Michel Couture
NDT Inspector, ,
consultant,
Canada,
Joined Sep 2006
517
Re: UT Equipment Calibration Doubt on TH Hill Standard.
In Reply to S.Senthilkumar on 20:52 Aug-09-2010 (Opening).

Most standard will require you to verify calibration any time one of the following happens:

- At the beginning and end of your shift or inspection (completing a work order).
- Every 8 hours
- Every 4 hours (ASME)
- Whenever something is changed from your setup; ie probe, power supply, lost of power, instrument, cable, couplant.
- Change of technicians

There maybe more to this list and I'm sure others will jump in to provide some answer.
Hope this may be of help.

 
 
13:56 Aug-10-2010

Andreas

NDT Inspector, Specially in the oilfield,
Tuboscope Vetco(Deutschland)Gmbh,
Germany,
Joined Oct 1999
80
Re: UT Equipment Calibration Doubt on TH Hill Standard.
In Reply to S.Senthilkumar on 20:52 Aug-09-2010 (Opening).

Calibration should be done at least every six month.
Standardization on a reference standard for distance and sensitivity should be done at the start , after 25 connection or something was change at the set up of your unit.
I think you mixed calibration with standardization.

Regards

Andreas

 
 
15:38 Aug-10-2010

Michel Couture
NDT Inspector, ,
consultant,
Canada,
Joined Sep 2006
517
Re: UT Equipment Calibration Doubt on TH Hill Standard.
In Reply to Andreas on 13:56 Aug-10-2010 .

Andreas,

You are right. here in North America, the words standardization and calibration are often interchange and you are technically correct. Although calibration per say is often performed every 3 months. As for standardisation, it depends on the code you are working to. I was told that in the petrolium industry, they will standardise after every circ weld or every 10 welds.

 
 
06:06 Aug-11-2010

S.Senthilkumar

Engineering, QA/QC/NDT,
NOV (National Oilwell Varco),
Angola,
Joined Mar 2006
35
Re: UT Equipment Calibration Doubt on TH Hill Standard.
In Reply to Michel Couture on 15:38 Aug-10-2010 .

Thanks Michel & Andreas,

Standardization means unformity in sensitivity. In ASME or Norsok it was mentioned 2 or more dB diffrence in change tested area shall be redo.
Here in TH Hill that criteria not given. This code is more stringent than ASME. I can take it like that?

SSenthilkumar

 
 
12:24 Aug-11-2010

Andreas

NDT Inspector, Specially in the oilfield,
Tuboscope Vetco(Deutschland)Gmbh,
Germany,
Joined Oct 1999
80
Re: UT Equipment Calibration Doubt on TH Hill Standard.
In Reply to S.Senthilkumar on 20:52 Aug-09-2010 (Opening).

You should read and understand the code you working with.

All calibration is to check and verify that your unit work to a national standard like for range mm or inch.
Standardizing you do on your reference standard mentioned on 3.16.4 b for distance and c for sensitivity.
At 3.16.4 i your tolerance of 2 db is mentioned.

Regards

Andreas

 
 
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