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Requirements for issuing MTR

Requirements for issuing MTR

Requirements for issuing MTR


I work at an ASME certified shop, and we receive all sorts of MTRs for the materials we use for the fabrication of pressure vessels. We've been asked a question though that has sent us up the food chain of material supply, and I'm lost for answers.

Do mills issuing MTRs require any special certification or licensing in order to write and issue an MTR?

I ask because a customer has asked if we can fabricate some unusual welded pipe diameters, and has asked that we certify the material by the welded pipe spec (A671 Gr CC70-CL22 in this case). By my understanding we would have to follow the A671 spec with regards to fabrication, testing, and marking, then issue our own MTR certifying the material.

Do we need any special licensing to issue an MTR? (We are in Canada if this makes any difference).


RE: Requirements for issuing MTR

Thanks Mike,

I guess I'm going through the same surprise and learning curve you did back in 2010. :)

Just as a thought experiment... say I was building an ASME VIII-1 CS vessel that was 36"OD x 3/8" thick. Normally in this case we would just roll some SA-516-70 plate and deal with long seams. Based on the MTR certification rules, do I then have the option to instead recertify the rolled can as an SA-671 pipe and go from there? In which case the AI should not be involved to the same extent when it comes to the long-seam weld inspection as this is considered supplied pipe material?


RE: Requirements for issuing MTR

Nope, just follow the rules (all of the testing) and certify that you did.
The only police are your customers. they of course can audit you and require verification of testing (procedures and training) and so on.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: Requirements for issuing MTR

marty007, I suppose you could, leaving aside the fact that SA-671 does not seem to be permitted for Sec VIII, Div 1.

Given the spec requirements, not sure it'd make sense, but that's not the issue either.

I'd get buy-in from all parties before proceeding though, that's for sure :)



RE: Requirements for issuing MTR

There is no official license needed for issuing an MTR. That being said, there are several things to watch out for.

Your material can always be tested by a customer, or an outside lab. In the event that you are publishing data that is not verifiable by other laboratories, then you can be held liable.

Therefore, it is imperative that you follow ASTM specs or similar to a T and do not deviate by any means. The ASTM tests are designed so that they are independently verifiable by any lab.

It follows then that you must make sure your testing machines are regularly calibrated, preferably by certified professionals under ISO 17025 or similar. You must also be using the correct equipment and accessories.

If you have any questions about specific ASTM specs, or are looking for more information, you can try visiting our website www.universalgripco.com We are building the largest library of standardized tests specific to Universal Testing Machines.

Hope this helped.

- Chris

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