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- since 1996 -
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Technical Discussions
Indra Anandan
NDT Inspector, R&D and Teacher
USA, Joined Dec 2015, 9

Indra Anandan

NDT Inspector, R&D and Teacher
USA,
Joined Dec 2015
9
07:09 Jan-11-2016
ASTM A578 Inspection

Can someone elaborate on 5% of the thickness that is mentioned in ASTM A578 Class A or Class B or Class C acceptance criteria
"Any Area where one or more discontinuity produce a continuous total loss of back wall reflection accompanied by continuous indication on same plane(within 5% of the plate thickness) that can not be encompassed within a circle whose diameter is 3"

Does the above mean if I find a discontinuity in the mid wall I don't need to worry?

Marcelo
Engineering, UT Level 3
Brazil, Joined Sep 2015, 6

Marcelo

Engineering, UT Level 3
Brazil,
Joined Sep 2015
6
14:24 Jan-11-2016
Re: ASTM A578 Inspection
In Reply to Indra Anandan at 07:09 Jan-11-2016 (Opening).

Not Indra,
It is referring to the plane of discontinuity, that is, if you have two indication in different thickness and the signal is continuous, this difference must be within 5% wall thickness to consider the discontinuity as same plane.

I will give you a example.
Suppose you have a 100mm wall thickness plate and find two discontinuity in the depth of 40mm and 43mm. 5% thickness is 5mm. So according to ASTM A578 you should consider these discontinuities as one single discontinuity.

NDT Inspector,
sadhana ndt services, India, Joined Dec 2014, 6

NDT Inspector,
India,
Joined Dec 2014
6
15:31 Jan-12-2016
Re: ASTM A578 Inspection
In Reply to Indra Anandan at 07:09 Jan-11-2016 (Opening).

m aslo getting same indication on plate of thickness 56mm..and in some area it showng loss of 30% ...
Its middle of plate ..n continuos ..all over plate...i wnat to know that two plates r joined or laninar crack or lamination ????

James E. Scalf
NDT Inspector,
Global Integrity, Canada, Joined Oct 2012, 274

James E. Scalf

NDT Inspector,
Global Integrity,
Joined Oct 2012
274
17:50 Jan-14-2016
Re: ASTM A578 Inspection

If the signal is uniform throughout the plate and at the same depth throughout and you know the plate is supposed 56mm then the indication has to be being caused by a lamination, lminar tesring or the fusion of two plates together that failed to fuse at the depth you are detecting.
If you don't mind sharing what is the plate a part of? is it a vessel floor, wall or other application? This might aid us in further helping you in determining the cause. Cheers...

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
13:48 Jan-15-2016
Re: ASTM A578 Inspection

What is the echo amplitude at midwall you found? And which probe are you using?

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
13:48 Jan-15-2016
Re: ASTM A578 Inspection

What is the echo amplitude at midwall you found? And which probe are you using?

NDT Inspector,
sadhana ndt services, India, Joined Dec 2014, 6

NDT Inspector,
India,
Joined Dec 2014
6
15:24 Jan-15-2016
Re: ASTM A578 Inspection
In Reply to massimo carminati at 13:48 Jan-15-2016 .

M usng 10mm dai 4MHz ,t-r probe...
this plate is part of hydraulic press of pressure 300tones

P V SASTRY
R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D, India, Joined Jan 2003, 195

P V SASTRY

R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D,
India,
Joined Jan 2003
195
07:20 Jan-16-2016
Re: ASTM A578 Inspection

Please clarify if this plate is part a of A hydraulic pressure vessel to hold 300Tons of pressure.

Some times the pressure vessels are made of multi layers to with stand higher pressures.

Best wishes

P V SASTRY

NDT Inspector,
sadhana ndt services, India, Joined Dec 2014, 6

NDT Inspector,
India,
Joined Dec 2014
6
16:55 Jan-19-2016
Re: ASTM A578 Inspection
In Reply to P V SASTRY at 07:20 Jan-16-2016 .

Purpose of plate is covering of hydraulik cylinder head, gauide plate ,
And suporting frame.etc

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