API Q1 - 5.7.1.5 - Validation of Processes for Production and Servicing

[Jayendra]

Hello everyone,

Would like to know the best way to validate the processes as NDE (MPI and PT) and PWHT. Also advise if supplier is performing NDE at our premises how to validate that process?

Appreciate your views on these.

Regards,
Jay

 

[Rene Minassian]

Hi Jay,
from my point of view the best way is to validate the process as described in the relevant norm or standard and there reference blocks defined by the norm or standard e.g. MT = Pie Gauge or Berthold. Or, if you have, a part you manufacture where you know you have failure which you like to identify. Those parts can be tested under the circumstances described in the procedure e.g. Ampere, Distance, Light, etc. etc. and if the failure are identified, fine, = validated. The same for the NDE service company.

 

[jmech]

I agree with Rene. As well, for NDE validation, you can find more detail in API 20D (although you would only be required to follow 20D if it is required by the product spec).

For PWHT validation, this is normally done together with the welding qualification. Weld and PWHT in accordance with the WPS, then test to validate that you achieved all the required properties (strength, hardness, etc.). If it passed, you've validated your WPS including the PWHT. Maintain the PQR with the test results as evidence.

 

[Jayendra]

Dear Jmech, We have used Pie Gauge but Auditor raised the Finding (Our Product Spec is API 6A which states API 20D or other applicable standard) as i am not sure whether Pie Gauge is acceptable by any standard referance. Also can you suggest for PT Validation also as we use Aluminium Block with Known defects. Thanks

 

[Rene Minassian]

Hi Jayendra, as far as I know, API 6A and API 20D do not require something specific. they refere to the common non destructive norms such as ASTM E 709 but may require a fluorescent inspection method or having spcific accaptance criteria. If we go in detail, the Pie Gauge would not be enough to validate. Off course you need a seperate validation of your fluid or suspension, magnitization, lightning (lx), etc. however, in the end the System is validated with the pie gauge having all elements verified on its own. Pie gauge allown would not enough.

W.r.t. penetrant testing, please find attached reference block we use to validate the test with. When testing youre product, you do exact the same with the reference block. This have never doubt in an Audit.