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Non-Destructive Examination for GRP Piping 1

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Lunbawang Piper

Mechanical
Jul 20, 2022
7
Hi all, this is my first post here.

I would like to ask if anyone have the experience with Radiography and Ultrasonic Examination for Glass-Fibre Reinforced Plastic Piping System. ISO 14692-4 Table A.1 had specified Radiography and Ultrasonic Examination as potential NDE methods to check for defects such as void, blisters, delamination, cracks and inadequate bonding. From my previous experience, we will only perform visual inspection and pressure testing, therefore are not familiar with other NDE methods on non-metallic piping.

Hope that anyone can share their experience in term of practicality and establishment of acceptance criteria.

Thank you in advance.
 
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MTI has done a lot of research on this, but I don't know how much is available to non-members.

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P.E. Metallurgy, consulting work welcomed
 
What did the vendors of the GRP piping tell you when you called them ?

MJCronin
Sr. Process Engineer
 
@LittleInch, Thank you for the very good reference. Will look into it in details.

@EdStainless, so we can agree here this is something that still in research mode, is it?

@MJCronin, the vendor does not have any experience on NDE.


I would like to implement this in my project, but somehow skeptical on the practicality and effectiveness. It would be also difficult in my country to get NDE operator that will be able to perform the work and interpret the result.
 
I agree. One issue is the acceptance criteria but also what do you do if it "fails"?

Cutting out a joint leaves you with two stubs which creates a weak spot.

Better I think to use pipe plugs and test every joint as you go.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
 
MTI has actually sponsored the building of equipment and field testing.
Some of this is real, but it may only work in specific cases.
I haven't kept up with the tech.

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P.E. Metallurgy, consulting work welcomed
 
NDT development appears to be geared more towards in service inspection rather than fabrication/construction quality control. The latter appears to be dominated by rigorous QA, in terms of personnel and procedure qualifications, and frequent hydrotesting to catch problems early before extensive amounts are buried, for example. HOIS have an in service inspection guide:
Steve Jones
Corrosion Management Consultant


All answers are personal opinions only and are in no way connected with any employer.
 
Thank you all for the feedback. Appreciate it much. For now, we may implement NDT for in service piping. For new system, we may perform NDT in the case of failed hydrotest.

I checked with local NDT Contractor, they are able to do it, but we need to provide a reference sample and establish the acceptance criteria. ISO 14692-4 Table A-1 provide quite a detail acceptance criterion, as example for air bubbles, none permitted with diameter greater than 3mm.

Hope to see more development in this area in the future.
 
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