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Meaning Of Pipe Class And Pipe Rating

pipe rating class asme

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#1 onakarnath112@gmail.com

onakarnath112@gmail.com

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Posted 27 October 2018 - 02:59 AM

hello sirs. I did a training in a chemical plant refinery recently. I could see that the pipe has asme rating which is 150, 300 etc. I also saw some tables in asme b16.5 showing pressure and temp. rating of this classes. is the meaning of this classes that the pipe of 300 class is good for that pr. and temp.? or is it means something else. Also, is design pressure based on the class...if 300 class and the design temp. pr from the b16.5 table? please comment. 

 

thanks, onakr



#2 fallah

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Posted 27 October 2018 - 03:49 AM

onkar,

 

The tables in B16.5 are being arranged for different materials groups. In each table of a material group for one temperature several pressures have been specified as corresponding limitation pressures of different piping classes. Obviously, for the temperatures and pressures other than those specified in the tables; the interpolation method should be applied to select the relevant piping class.

 

Design pressure and temperature of a piping system are to be specified by process engineer and the relevant class should be specified by piping engineer using the tables in B16.5. 



#3 onakarnath112@gmail.com

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Posted 28 October 2018 - 01:12 AM

hello mr. fallah, 

 

So, if we have piping of 300 class but design temp. and press is for example 200 oF at 275 psig.  But 300 class is good for 750 psi at 200 oF as per table below ...if design condition come in actual -- the piping will be safe always?  How does process engineer set the design conditions in general?

 

ANSI-to-PSI.jpg



#4 fallah

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Posted 28 October 2018 - 01:37 AM   Best Answer

onkar,

 

Yes,  #300 piping system is safe for above design conditions...

 

Design pressure and temperature are to be set by process engineer using the maximum operating pressure/temperature (among all cases including normal condition, start up, maintenance, shut down....cases) as a base plus a reasonable margin to consider safety aspects...






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