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.
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