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ASME B31.3 Process Piping

ASME B31.3 Process Piping

ASME B31.3 Process Piping

Dear Forum Members,
    Hello.  I'm currently designing a valve and have been told to use the the B31.3 standard.  I have to use a material that will withstand high pressures, but is magnetically soft.  My question relates to choosing a coded material.  The material will be subject to cyclic loading so I've been looking at the materials on page 28, 305.2.3.  I don't need help choosing a material so much as finding out the characteristics of these metals.  They are all ASTM materials, is there any way to find AISI materials that correspond to these?  I looked on MatWeb as someone suggested this in a previous post.
    I mostly need to see things like a thermal expansion coefficient, magnetic permeability, and the stress levels it can withstand.  I'm just curious if there is a way to find these things without purchasing the individual standards themselves.  I don't usually work with standards, please forgive me if I'm missing the big picture.
     One final question, ASME publishes a guide book to go along with B31.3, has anyone purchased this and was it useful?  Thanks in advance for any information.

Take care,

RE: ASME B31.3 Process Piping


You cannot specify a valve using only ASME B31.3.

ASME B31.3 is concerned only with the structural integrity of the valve and the compatablity with the piping system.

I suggest that you visit/talk with a valve website (perhaps VELAN or Typo/Flowserve)representative.

Tell him of your magnetic(??)and actuation requirements and he can give you a recommendation.

There are books devoted just to valve design and specification:




- Go steelers..



RE: ASME B31.3 Process Piping

Dear MJCronin,
     Hello.  Thanks for your response, I was not accurate in my original statement, we are just trying to provide enough information to show that the valve is safe to test, structural integrity is all we are concerned with as far as that standard goes.  Now that still may not be enough as I don't know a lot about these standards, and after reading this one, I think I know even less.  We just need to show that under the pressures it will be tested it will not explode.  I will definitely check out those books you mentioned and look into the companies you mentioned.  Thanks again for your help, I really appreciate it.
     As for the Steelers, I'm optimistic other than the O-Line.

Take care,

RE: ASME B31.3 Process Piping


I suggest you to use ASME B16.34 instead of B31.3.


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