schedule & class

I can only assume that you mean Schedule and Class as used in Piping Engineering and Design:

Schedule refers to the wall thickness of pipe and butt-weld fittings

Class refers to flange ratings and the rating of valves

These terms are also used in:

• Education
• Electrical equipment and material
  

thanks for reply but what it means rating?

for example what is difference between 150# & 300# flange?

I know that As per our pressure requirement we select particular class of flange as per ASME B 16.5 standard.

but what exactly 150,300,600 is related with value of pressure.

Go here:

http://www.scsenergy.com/scsdataflgrating.htm

For a Flange Rating Chart

hi ,

do you have any idea why the socket weld components are designated by class not by schedule ?