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ASTM A325 Bolts in 300# Service

Thread starter UW1981
Start date Oct 25, 2006

Status: Not open for further replies.

Oct 25, 2006

UW1981

Mechanical

It appears B31.3 allows the use of ASTM A325 bolts (although they are normally considered "structureal" bolts), but they are not listed in B16.5....

Are A325 bolts allowed in hydrocarbon service for flanges, assuming the allowable stress for the bolt is not exceeded for the service (the allowable stress for ASTM A325 bolts is signficantly less than A193 B7 bolts, and the A325 bolt can be the "weak link" in a 600# flange system). Our system is a 300# system, propane, 100F or so.

Thanx.