Depends where your from and what the local codes require. One of the best places to start is the NBBI OR AMSE. National board of Boiler Inspectors.
He = ASME = heating
Well over 2,000 DEG F super heated steam like ships and power plants use
Boiler can be classified as below
to this question is very simple as the meaning of pressure is force on unit area, so more units of area or simply more area of a vessel containing a pressurized fluid in it exerting force on its...