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A671 - What Class?

A671 - What Class?

A671 - What Class?

(OP)
Any help or suggestions would be greatly received.

We have a client that has specified the material of construction to be A671 (he has not defined a class). They are simple pipe spools ranging from 30" to 60" diameters.

They have to be suitable down to -50F.

I have suggested using 516 Gr.60. The problem I am having is determining what class they should be.

Are there rules for determining this?

I would like to go with Class 10, no HT, RT or hydro.

Thanks in advance.

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