Material characteristic of Fittings (Elbows, Reducers, Tees) 1

[KOSUPPLY]

Would there be any difference in the material characteristics of WPHY 42 and WPB with a minimum of 42,000 yield. What is the effect if the WPB with 42K yield is used in lieu of the WPHY 42?

I am aware that WPHY is generally associated with higher yields like WPHY 60 but this time we are only asked for 42k yield and I want to know if the WPB (42k min yield) would generally be accepted as a substitute.

 

[BigInch]

ASTM A234 WPB yield stress is 32 ksi
ASTM A234 WPC yield stress is 40 ksi
WPHY is an MSS SP-75 designation for higher yield strength fittings 42 = 42 ksi, 60 = 60 ksi, etc.

Because of the different yield strengths associated with each one, none could be considered equal.

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"The problem isn't finding the solution, its trying to get to the real question." BigInch

http://virtualpipeline.spaces.live.com/

 

[KOSUPPLY]

Thanks BigInch,

My understanding is that the A234 WPB has a minimum yield of 32ksi as you stated. However I have material test reports showing this A234 WPB with yields from 43100 - 49400 ksi (They exceed the minimum yield). This would fall within the parameters of the MSS SP-75 WPHY 42 for yield. Other than yield which this WPB material meets, are there any other differences that I should consider or should know about if we decide to substitute this material?

I have attached the material test report for the A234 WPB which shows the yields.

 

[BigInch]

Yield strengths vary from batch to batch and it is quite possible that the fitting has yields higher than that required, BUT SP-75 still has many other requirements that 234 WBP dosn't address; too many to address here. ASTM A234 is basically one material specification for low strength fittings. SP-75 concerns high strength fittings. Its not only about yield stress. You really need to read both specs. don't you think.

**********************
"The problem isn't finding the solution, its trying to get to the real question." BigInch

http://virtualpipeline.spaces.live.com/

 

[KOSUPPLY]

Yes you are absolutely right I should read both specs, but I am having trouble finding them, thats why I came here. Thanks a bunch for you input, you have been really helpful.

 

[BigInch]

Don't substitute anything until you get those specs, then you'll know why you can't.

**********************
"The problem isn't finding the solution, its trying to get to the real question." BigInch

http://virtualpipeline.spaces.live.com/