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Rerating ASME Section IV Boiler

Thread starter procyonlotor
Start date Yesterday at 8:57 PM

Yesterday at 8:57 PM

procyonlotor

Mechanical

I currently work for a Mechanical contractor that has our ASME U, S, H stamps and NB R stamp and I am trying to rerate a 15PSI steam boiler. The boiler has a tubesheet that is unstayed made of .5" thick SA-285C. When I attempt to find pressure using the equation from HG-307.2 t=d*sqrt(CP/S) I am getting results smaller than the max allowable working pressure. The boiler diameter is 60" and the shell is made of SA-36 that is 5/16" thick. Any help would be greatly appreciated