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Liu
Engineering,
China, Joined Jul 2012, 34

Liu

Engineering,
China,
Joined Jul 2012
34
03:06 Jul-25-2012
Piping UT as per B31.3

Ladies and gentlemen;
I have sent this weft yesterday, sorry to re-sent,but you konw I havent fall asleep last night,I really need you help,Bcoz God is blank in UT
i have met a issue about the UT testing on piping according to B31.3,the client agreed we using UT in lieu of RT for the big wall thickness Carbon steel,due to no access for radiography,it's field weld,questions are as following:
1,UT acceptance criteria,should i follow 344.6.2,but no requirements for the serious defect?or i should follow ASME VIII appendix 12?
2,what reference sensitivity block should i used ?should i follow ASME T-434.3,that means we need to prepare a block for each Spec. weld, am i right?(a section of pipe and shall be the nominal size and schedule....),this block was machined as per Fig,T-434.3,so the reflectors are notch,the client thought that the the basic sensitivity use the nocth is too low and ask us using SDH
what should i do,fresh man always appreciate for any help!

 
 Reply 
 
Ed T.
Other, ASNT Level III, UT, RT, MT, PT, VT
NDT Level III, Saudi Arabia, Joined Sep 2011, 169

Ed T.

Other, ASNT Level III, UT, RT, MT, PT, VT
NDT Level III,
Saudi Arabia,
Joined Sep 2011
169
09:27 Jul-25-2012
Re: Piping UT as per B31.3
In Reply to Liu at 03:06 Jul-25-2012 (Opening).

First of all, what are you inspecting? Is it piping or a vessel? The only time you need to go to ASME Sec VIII is for vessels.

If it is piping, is it normal fluid servicce, Severe Cyclic or what?

I don't understand what you mean by a "serious defect".

Please provide more details so we can help you.

 
 Reply 
 
Liu
Engineering,
China, Joined Jul 2012, 34

Liu

Engineering,
China,
Joined Jul 2012
34
10:17 Jul-25-2012
Re: Piping UT as per B31.3
In Reply to Ed T. at 09:27 Jul-25-2012 .

Hi sir,
thanks for you response!

it piping on the LNG plant and the category is Normal fluid service,

serious defect mean such as LOF/LP/Crack whicch is rejectable regardless of length according to ASME VIII appendix 12,

we intend to using manual UT in lieu of radiography on those field weld with big wall thickness(carbon steel)

how to set the basic sensitivity according to ASME B31.3?

 
 Reply 
 
Ed T.
Other, ASNT Level III, UT, RT, MT, PT, VT
NDT Level III, Saudi Arabia, Joined Sep 2011, 169

Ed T.

Other, ASNT Level III, UT, RT, MT, PT, VT
NDT Level III,
Saudi Arabia,
Joined Sep 2011
169
13:04 Jul-25-2012
Re: Piping UT as per B31.3
In Reply to Liu at 10:17 Jul-25-2012 .

I don't know why you keep referring to ASME Sec. VIII. That is only for vessels.
You can find your UT acceptance criteria in B31.3 344.6.2

Acceptance Criteria. A discontinuity is unacceptable if the amplitude exceeds the reference level and its

(a) 6 mm (1⁄4 in.) for Tw ≤ 19 mm
(b) Tw/3 for 19 mm < Tw ≤ 57 mm
(c) 19 mm for Tw > 57 mm

It doesn't address the type of defect. Only linear. That is your UT Acceptance criteria. If your client wants to reject serious defects regardless of length, then do it. Otherwise this is your acceptance criteria.

 
 Reply 
 
Ed T.
Other, ASNT Level III, UT, RT, MT, PT, VT
NDT Level III, Saudi Arabia, Joined Sep 2011, 169

Ed T.

Other, ASNT Level III, UT, RT, MT, PT, VT
NDT Level III,
Saudi Arabia,
Joined Sep 2011
169
13:24 Jul-25-2012
Re: Piping UT as per B31.3
In Reply to Ed T. at 13:04 Jul-25-2012 .

Your calibration block should be in accordance with ASME Sec. V Article 4,FIG. T-434.3 CALIBRATION BLOCK FOR PIPE

 
 Reply 
 
Liu
Engineering,
China, Joined Jul 2012, 34

Liu

Engineering,
China,
Joined Jul 2012
34
16:57 Jul-25-2012
Re: Piping UT as per B31.3
In Reply to Ed T. at 13:24 Jul-25-2012 .

Hi Ed T.
thank you for you reply
i have got what you mean,but i sitll a bit confusion on it, if the UT calibration block was processed in accordance with ASME Sec. V Article 4,FIG. T-434.3,that means the reflector would be NOCTH,then the basic sensitivity would be extremely low(about 38dB for 45 degree, 38.1mm block )

doesn't this could be acceptable for piping UT?
meanwhile,the Acceptance Criteria stated that "exceeds the reference level ",if we perform UT as following, most of the defect would be acceptable,even serious defects such as LOF/LP/Crack,
i still doubte if i got a slag and the amplitude was 80%DAC,not exceed the reference level.but the length is 500MM and continually,it is acceptable according to the B31.3?

another issue:
if UT calibration block was processed in accordance with ASME Sec. V Article 4,FIG. T-434.3,that means each size of the piping should machining a corresponding block? for example,we have a clibration block Dia.=500mm,thickness=38mm,does this block can cover Dia.=400mm,thickness=41mm?

i have never perform UT according to ASME B31.3,it is strange to me,really appreciate anyone can give me some suggestion .thanks

 
 Reply 
 
Chris O.
NDT Inspector,
USA, Joined Jul 2012, 6

Chris O.

NDT Inspector,
USA,
Joined Jul 2012
6
00:01 Jul-26-2012
Re: Piping UT as per B31.3
In Reply to Liu at 16:57 Jul-25-2012 .

Liu,

10% Notches are a pretty common reference reflector. I noticed you were asking some Phased Array questions earlier. You wouldn't happen to be using PA on this, would you? If so, you are correct in assuming that calibrating on that notch is a problem. If you are using conventional, then as Ed said, you will have to stipulate a more strict acceptance criteria.

 
 Reply 
 
Liu
Liu
06:32 Jul-26-2012
Re: Piping UT as per B31.3
In Reply to Chris O. at 00:01 Jul-26-2012 .

Hi Chris,
we are intend to use PA on those big wall thickness piping weld,we have done lots of preparations on 2011,processed more than 20pcs qulification blocks with different schedules,finally we faid to passing bcoz the client deem that our guys are inexperience,and they required a ASNT L3 on site for 3 month,we can't pay for that,so failed
in the other hand,those weld include lot of piping to fittings welds,it is unsuitable for the PA,our client refused our propose of which scan from one side only.

 
 Reply 
 
Larry
Consultant, VP Quality/Corporate NDT Level III
USA, Joined Mar 2012, 1

Larry

Consultant, VP Quality/Corporate NDT Level III
USA,
Joined Mar 2012
1
22:55 Aug-21-2012
Re: Piping UT as per B31.3
In Reply to Liu at 06:32 Jul-26-2012 .

If youy intend to use B31.3 you should discuss using Code Case 181 "Alternative Acceptance Criteria" for using Phased Array UT. It is much more realistic than 344.6.2.

 
 Reply 
 
massimo carminati
Consultant, AUT specialist
IMG Ultrasuoni Srl, Italy, Joined Apr 2007, 691

massimo carminati

Consultant, AUT specialist
IMG Ultrasuoni Srl,
Italy,
Joined Apr 2007
691
18:59 Aug-22-2012
Re: Piping UT as per B31.3
In Reply to Liu at 03:06 Jul-25-2012 (Opening).

if UT is in lieu of radiography, than you should apply code case 181 which UT with data recording.

 
 Reply 
 
Robbert
Robbert
13:23 Feb-26-2014
Re: Piping UT as per B31.3
In Reply to massimo carminati at 18:59 Aug-22-2012 .

Hi all,

Sorry to revise an old topic, but I was wondering if one can use UT in lieu of RT, in accordance with B31.3 (Normal).

I cannot find any text in the B31.3 in regard to this, and am wondering what criteria have to be met to do this (and then include the cc181-2).

Can anyone point me in the right direction?

 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1274

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1274
14:45 Feb-26-2014
Re: Piping UT as per B31.3
In Reply to Robbert at 13:23 Feb-26-2014 .

Robbert, a read of the requirements of Chapter VI "Inspection, Examination and Testing" should be done for starters. For Normal Fluid Service you look to 341.4.1 under (b) Other Examination and the first item noted is the volumetric requirements.
(1) Not less than 5% of circumferential butt and miter groove welds shall be examined fully by random radiography in accordance with para. 344.5 or by random ultrasonic examination in accordance with para. 344.6.
It is clear there that EITHER RT or UT may be used...it is NOT a matter of UT in lieu of RT.
As for CC181, I recommend you read the introductory statement there. it is not a request to use UT in lieu of RT. Instead it is asking permission to use an alternative acceptance criteria.

1
 
 Reply 
 
syed abudhahir
United Arab Emirates (UAE), Joined Jan 2016, 1

syed abudhahir

United Arab Emirates (UAE),
Joined Jan 2016
1
12:21 Jan-26-2016
Re: Piping UT as per B31.3
In Reply to Liu at 03:06 Jul-25-2012 (Opening).

dear friends ,
ultrasonic testing code b 31.3 lop , lof , slag , crack , pore , c.pore, all indication acceptance criteria need for me. please clear explain example.

 
 Reply 
 
ngo tuong
NDT Inspector, PV EIC NDT
PV EIC NDT, Vietnam, Joined Mar 2014, 19

ngo tuong

NDT Inspector, PV EIC NDT
PV EIC NDT,
Vietnam,
Joined Mar 2014
19
15:53 Jun-25-2016
Re: Piping UT as per B31.3
In Reply to Ed Ginzel at 14:45 Feb-26-2014 .

Dear Sirs,
With pipe line using API 1104, can i using UT in lieu RT?
Kind Regards

 
 Reply 
 
Jhonatan Pereira
Engineering,
pdvsa intevep, Venezuela, Joined Apr 2013, 1

Jhonatan Pereira

Engineering,
pdvsa intevep,
Venezuela,
Joined Apr 2013
1
14:42 Jun-28-2016
Re: Piping UT as per B31.3
In Reply to ngo tuong at 15:53 Jun-25-2016 .

Hi ngo tuong,

The answer to your question is yes, you are be able to use UT on pipe line using API 1104.

You can see the details of ultrasonic test on the API standard API 1104, edition 2013, one of the most important points are 11.4.1 (ultrasonic test Methods), 11.4.4 (demostration of the testing procedure), 9.6.1 (classification of indications) and 9.6.2 (acceptance standards), 11.4.5 (API sensitivity reference standard)

With the case of acceptance criteria. In the annex A explain how can you provide a acceptance criteria alternative of the point 9.6.2 based on fracture mechanics. this alternative incorporates the evaluation of the height and length of imperfections.

I hope I helped you

Jhonatan Pereira

 
 Reply 
 
ngo tuong
NDT Inspector, PV EIC NDT
PV EIC NDT, Vietnam, Joined Mar 2014, 19

ngo tuong

NDT Inspector, PV EIC NDT
PV EIC NDT,
Vietnam,
Joined Mar 2014
19
12:22 Jun-30-2016
Re: Piping UT as per B31.3
In Reply to Jhonatan Pereira at 14:42 Jun-28-2016 .

Dear Jhonatan Pereira,
Thanks you for your reccomended
How can i setup TCG for this case because following API 1104 the specimen only have 2 notchs at top and bottom of it?
Can I using side drill holes following Section V for settup TCG after that check sentivity by notch?
Kinds Regards,

 
 Reply 
 

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