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Technical Discussions
James Cook
NDT Inspector,
Consolidated Engineering, USA, Joined May 2014, 3

James Cook

NDT Inspector,
Consolidated Engineering,
USA,
Joined May 2014
3
00:30 May-02-2014
API 1104 Manual UT

Writing API 1104 Procedure. Unclear on details, ie 2 point DAC?
Also flat bottom holes...how are they a part of calibration?

 
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Dent
Consultant, NDE Manager NDELevel III/3
NDT Consultant, Canada, Joined Nov 1998, 250

Dent

Consultant, NDE Manager NDELevel III/3
NDT Consultant,
Canada,
Joined Nov 1998
250
16:13 May-02-2014
Re: API 1104 Manual UT
In Reply to James Cook at 00:30 May-02-2014 (Opening).

Wow. You are ASNT Level III UT!

 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
03:30 May-03-2014
Re: API 1104 Manual UT
In Reply to Dent at 16:13 May-02-2014 .

Dent

No practical element in the ASNT Level III exam might go some (but not all) the way to explain James' predicament. Or more likely he is not a UT Level 3

James

First dont get calibration and sensitivity confused. Generally FBHs are used for sensitivity setting (eg DAC) which requires a minimum of 3 points (reflectors) to create a curve, less and its a straight line!

To calibrate shear wave probes you'll need two simultaneous reflectors at known (differing) beam paths, for example use the 25 and 50mm radii of the V2 kidney block to set echoes from 25 mm and 100mm, then reverse the probe, aim at the 50mm radius and check the response is at 50mm. If this is accurate you'll have successfully calibrated your screen / probe combination for 0 to 100mm. You'll need to do this fro each probe you plan on using eg 45, 60 annd 70 degrees. Once you have calibrated your screen with your first probe for all renaming angle probes you'll just need to marginally adjust your delay to compensate for differing bean paths with differing angles in the wedges.

 
 Reply 
 
James Cook
NDT Inspector,
Consolidated Engineering, USA, Joined May 2014, 3

James Cook

NDT Inspector,
Consolidated Engineering,
USA,
Joined May 2014
3
05:46 May-28-2014
Re: API 1104 Manual UT
In Reply to Nigel Armstrong at 03:30 May-03-2014 .

I get all this, now also well versed on placement and use FBH's. Not required for Manual UT only and NOT doing AUT. N10 notches: only 2? Or use 3rd leg for 3 point DAC. Cannot account for attenuation w/2. But what are size limits on cal standards: If you are testing 6" must cal standard be 6 (same grade) or is there range as in ASME? Range of wall thickness also or only per actual weldment? Recommended xducer SIZES? Probably 1/2 round.

30 year vet of AWS D1.1, D1.5, D1.8, TKY, Annex S, etc, find 1104 vague, lacking detail.

ASNT #25586

 
 Reply 
 
john
john
16:38 May-28-2014
Re: API 1104 Manual UT
In Reply to James Cook at 05:46 May-28-2014 .

James, are you working to the referenced "E164"? i dont see mention of FBH, just SDH for shear-wave and dont see reference to the "2 pt" DAC. were are you finding this? are you inspecting welds? See E164 for the details that you seek.

 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1286

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1286
18:05 May-28-2014
Re: API 1104 Manual UT
In Reply to James Cook at 05:46 May-28-2014 .

James, I am not sure which edition of 1104 you are working to, but in the 20th edition it states the details you are asking about in para 11.4.5:
"Manual ultrasonic testing sensitivity shall be based on a two or three point reference level (i.e., distance amplitude correction [DAC] or time corrected gain [TCG]) derived from an N10 notch introduced into a sample of the pipe to be inspected."

A DAC or TCG accounts for attenuation. Details of your Procedure are to be documented (see para 11.4.2.2) and prior to approval the Procedure is to be demonstrated (see para 11.4.4).

 
 Reply 
 

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