where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -
496 views
Technical Discussions
Rene
El Salvador, Joined Apr 2019, 3

Rene

El Salvador,
Joined Apr 2019
3
01:05 Apr-06-2019
DAC calibration using curved Block

Hi guys

I have a question

For UT shear wave weld inspection of butt weld on 2'' diameter piping, i can use basic calibration block given in ASME ,Figure T-434.3-2 for DAC curve, right? i will use the same material specification group P1.
Later, do a i need the dac offset curve al 6db and 12db for rejection criteria? or with the principal curve dac is enough?

thanks

 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 191

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
191
22:21 Apr-06-2019
Re: DAC calibration using curved Block
In Reply to Rene at 01:05 Apr-06-2019 (Opening).

Hi Rene:

Yes, absolutely you can use the alternative block shown in Fig. T-434.3-2. You will need to generate a DAC/TCG, and then add 6dB of scanning gain as per T-471.4.1.

The rejection level (re: your 6dB or 12dB offset from reference) will depend on the code that you are inspecting to. If they are ASME B31.3 (process piping) welds, then the rejection level is actually the reference level (i.e. unless the indication breaks DAC, ignore it).

1
 
 Reply 
 
Rene
El Salvador, Joined Apr 2019, 3

Rene

El Salvador,
Joined Apr 2019
3
03:48 Apr-07-2019
Re: DAC calibration using curved Block
In Reply to Paul Holloway at 22:21 Apr-06-2019 .

Thanks Paul,

I will examine a 1/4" thick overheating pipe, can i generate the DAC curve only with a 1mm side drill hole at half the thickness as reference level?

 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 191

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
191
10:39 Apr-07-2019
Re: DAC calibration using curved Block
In Reply to Rene at 03:48 Apr-07-2019 .

Unfortunately you won't be able to use a SDH. ASME states that the hole must be 38mm (1.5“) long and you simply won't be able to drill that on a 2" OD and 1/4" thick pipe. There's not enough material.

 
 Reply 
 

Product Spotlight

IntraPhase Athena Phased Array System

The Athena Phased Array system, manufactured by WesDyne NDE Products & Technology, consists of a pha
...
sed array acquisition system and PC running IntraSpect software. A PC is used to perform acquisition, analysis and storage of the data. System hardware is capable of operating up to four data sets with any combination of phased array or conventional UT probes. NOW AVAILABLE IN 64-64 CONFIGURATION.
>

GUL QSR1® Scanning

How do you measure pipe wall thickness without direct access to the area? QSR® Scanning - Guide Wav
...
e Quantitative Short Range Scanning.
>

FAAST-PA! OEM Patented phased Array for high speed UT inspection

Multiangle, Multifocus, Multifrequency, Multibeam. Instead of stacking UT electronics and having m
...
any PA probes, FAAST-PA is able to transmit all delay laws within ONE single shot in Real time.
>

Semi-Automated Phased Array Immersion System for Small Composite Parts

Turn-key semi-automated system as an improved and affordable solution for inspection of small comp
...
osite parts. Includes support table, immersion tank, scanner, PA instrument, PC, Analysis software, database, wedge management and other options.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window