Why hydro multiplier on B31.3 but not B31.1?
Why hydro multiplier on B31.3 but not B31.1?
(OP)
I am curious why B31.3 required a hydrotest increase relative to operating vs test allowable stresses ratio
and B31.1 does not. It uses a straight 1.5x design.
and B31.1 does not. It uses a straight 1.5x design.





RE: Why hydro multiplier on B31.3 but not B31.1?
B31.1 follows basic tenants of ASME I.
RE: Why hydro multiplier on B31.3 but not B31.1?
There must be some reason it is implemented in one and not the other. Could it be B31.1 applications tend to be higher temp and therfore result in impractical test pressures at room temp? I just dont know...
RE: Why hydro multiplier on B31.3 but not B31.1?
For this reason, Even if B31.1 required the increase, there would be far fewer cases where the calculation actually resulted in an increase above 1.5x.
RE: Why hydro multiplier on B31.3 but not B31.1?
Thanks for pointing that out...
RE: Why hydro multiplier on B31.3 but not B31.1?