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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?

[ankitg009]

My comment might be a bit naive but still ,allow me to try.

 

I have prepared a piping spec in a recent past. In that I have selected MOC based on services. Pound rating is selected based on the pressure and temperature of the service ,the pipe is desired for.

 

So under given temperature and pressure, we decide MOC based on service. You are right that we can increase the thickness to withstand any pressure but it will be only done if the pipe of lesser thickness is not able to withstand that pressure. More the thickness ,more is the cost.

 

I hope it will solve your query.

[samayaraj]

MOC is selected not only based on service. Also based on temperature too. For CS upto 400 Deg. C we can use. Above 400 Deg. C, we have to go for low alloy steel or SS.