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B31.3 v Section II D Pipe Design

B31.3 v Section II D Pipe Design

B31.3 v Section II D Pipe Design

(OP)
Trying to design a piping system with duplex pipe material S31803 A928 CL1 to ASME B31.3.
B31.3 does not list the stress values for this material.
Is the correct procedure to use a similar material in B31.3, say A790 S31803 or should one refer to ASME II Part D?

Per the example above if one compares the stress value at say 200°C, then the
A928 S31803 = A240 = 165MPA (from Part D)
A790 S31803 = 198.7MPA (from B31.3)

Any advice much appreciated.

J

RE: B31.3 v Section II D Pipe Design

Refer to B31.3 para 323.1.2 for (specific and para 323 for general) requirements and guidance on use of unlisted materials in B31.3 piping systems.

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