Destructive testing of pipe

[Mikeqc1]

When making pipe say wall thickness .281 is being produced and needs to have tensile pulls done.
how do i get a sample size of .965 x .394?

 

[cloa]

To what standard?, sounds like ASTM type of standard rather than ASME.

 

[Mikeqc1]

ASME

 

[cloa]

Which AMSE Standard?

 

[Mikeqc1]

sa-333 5" xs pipe

 

[trottiey]

Mikeqc1, I think you've puzzled us. Tension tests would normally be done on a full section per SA-370 annex A2. Where are you getting your specimen dimensions from? Your 0.394" dimension happens to be a standard specimen size for impact tests, not tensile. If you're concerned about impact tests, look at UG-84(c)(5)(b) for sub-size specimens. But I have no idea where you got 0.965" from.

 

[trottiey]

Ah, I found your other thread with the MTR: thread292-286224

Is this what you are talking about? That MTR indicates a longitudinal strip test with a wall thickness of .394" on the sample. This .394" wall is within the tolerance range of NPS 5 XS pipe.

In your other thread you said you got another batch of NPS 4 pipe with .281 wall with the same heat number. I believe your MTR would not cover that NPS 4 pipe because SA-530 section 26.1.5 requires the tension sample to have the same diameter and wall thickness. Does that answer your question?

 

[Mikeqc1]

i have an MTR for the 4" with a .281 wall, the impactsubsize works out over 80% but on that case what cert the tensile pull is .965 x .394 how can that be?

As for the 5" pipe the wall thickness covers my concern.
You input has helped me to decide that i will not reject this load of pipe, but i will look at som e of the other suppliers MTRS see if they have ever reduced the impacts on this pipe.

 

[trottiey]

As far as I can tell, a tensile pull on a .965 X .394 strip cannot represent an SA-333 pipe with .281 wall. My guess would be they sent you the wrong MTR.

 

[Mikeqc1]

Does not seem right huh?