NACE compliance for Bi-Directional PIGS

[gafoorkti]

Gents, I need your advice.

We have received 12" Bi-directional PIGS with Polyeurethane discs. Upon review of certifcates, it is found that body material(3" sch 40 pipe API 5L Gr. B used for the fabrication of PIGS) material test certifcate doesn't have NACE compliance.
As per our requirement, all Bi-Di PIGS are to be NACE compliance and hence we have rejected the item and conveyed our discrepancy report to manufacturer.

Now, manufacturer submitted his inspection report staing that all PIGS are in-compliance with NACE.

Can the PIG manufactuer certify that the supplied PIGS are in compliance with NACE?

Thanks and regards

 

[SJones]

thread367-292813


Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

 

[gafoorkti]

Steve, thanks for your valuable input. Still I am not clear.

Please Can somebody tell me about the following queries:

1)What are the requirements to be met to certify any material (Ex: Pipe, flange) and fabricated component(Ex: Pig Body, exapnsion bellows, oil cooler) to NACE MR-0175.

2) Is hardness measurement mandtory to certify material to NACE.

3) Can any fabrication contractor certtify the component to NACE compliance ?

Regards

 

[SJones]

1) The end user ascertains what tests are required, how they are to be performed, and the acceptance criteria that, in their opinion, constitutes demonstration of compliance and clearly specifies the same.

2) For carbon and low alloy steel, refer to ISO 15156-2, subclause 7.3, particularly the first sentence of sub-subclause 7.3.2 wherein it states, quote "If hardness measurements on parent material are specified..." Note the use of the word 'if.'

3) See 1) and 2) above and then refer to ISO 15156-1 - the last sentence of the WARNING statement followed by the last sentence of clause 9, wherein it states "The equipment user shall be responsible for ensuring that the required documentation is prepared".

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

 

[gr2vessels]

Just a small comment;- you, the end user are responsible to define the process fluid composition, properties and thermal/pressure conditions. Based on the 'NACE' standard requirements for the process conditions defined by you, the manufacturer has to prove to you with adequate tests results that the 'NACE' minimum requirements have been complied with. That includes material certs, thermal treatment, approved/suitable WPS/PQR's, hardness tests, etc. Also, you or your representative has to be familiar with materials and corrosion engineering.
Cheers,
gr2vessels