A105 Flanges used in place of A694 5

[texasmetal]

We have some small spool pieces that were fabricated offsite. The drawings called for A694 F52 6" 1500 series RTJ flanges. The material that was delivered to the offsite contractor was A105 6" 1500 series RTJ flanges. This is on a compressor station governed by B31-8. I can't find A694 in the B16.5 spec that B31-8 requires. But A694 B16.5 is on the bill of material on the drawing. The MTR for the A105 has a minimum yield strength of 42KSI on the MTR and is welding to a 6" X52 pipe. Would these flanges be considered equivalent? I can't find any information on the A694 flanges.

 

[GD2]

Texasmetal,
Not only the bore. Look for the material requistion and find out how the flanges were specified. We are trying to find out here whether the SMYS difference was taken into account to specify the minimum hub wall thickness. Unless the MR was initiated by a competent engineer, others won't be able to specify it. Usually, the supplier will match the connecting pipe schedule ID and OD and will have no knowledge to compensate the yield strengths.

Ganga D. Deka, P. Eng
Canada