Dear All
I am a little confused about the contents and the use of a Pipe Class or Pipe Specification Index. It contains information about various pound ratings (150, 300, 500, ...) and the various materials of construction for each rating at various temperatures and pressures. But why do we have different MOC for different pressure ratings? Can't we just increase the thickness of the pipe so that it can withstand any pressure, irrespective of the material?