Boiler Pressures
Boiler Pressures
(OP)
Are listed boiler pressures always given as gauge pressures? That would seem to make sense to me and I've seen them listed as psig before. However, I've notitced that most of the time pressure is given as just 'psi'. Can i assume that that is psig?





RE: Boiler Pressures
rmw
RE: Boiler Pressures
RE: Boiler Pressures
I thought your question pertained to the guages that the operators used day in, day out for operation.
rmw
RE: Boiler Pressures
RE: Boiler Pressures
rmw
RE: Boiler Pressures
I'm fairly certain it's gauge pressure.
RE: Boiler Pressures
The most annoying thing for me is to have to divide the old fashioned pressures mentioned by 14.5 to arrive at a meaningful number
RE: Boiler Pressures
Sure. At a boiler pressure of 1200 psi - does it matter if the rating/design criteria is 1200 psig (which is almost certainly the case) or 1215 psia? No, not really.
But you are down lower - much lower. And 15 psi difference on a 160 psix boiler IS a big deal: almost 10% of the working pressure!
Yes. Track down the definition specifically. That 15 psi difference matters on relief valve settings, and it matters in this case on the design spec's.