2 replies to this topic

[PME]

Pl. give your valuable comments :

1. Piping Spec is 150# but flanges are 150#,300#,600#,etc.Why?

2. RTJ Flange is used for 900# and above but it is available in 300# in spec 3CB2S01.Why?

Thanks
Sachin

[djack77494]

PME,
I don't know your specifics, but there is never a problem in using a more robust flange than is required. There are some good reasons for using a "better" flange. For example, some company standards call for a minimum of 300# for vessel nozzles. It's a good idea if these are available in 150# specs. Also consider spec breaks (changes). You can't connect a 300# flange on one side of the spec break with a 150# flange on the other.

[fallah]

Pl. give your valuable comments :

1. Piping Spec is 150# but flanges are 150#,300#,600#,etc.Why?

2. RTJ Flange is used for 900# and above but it is available in 300# in spec 3CB2S01.Why?

Thanks
Sachin

Pipes are specified by Sch. that itself indicates thickness calculated based on P,D,Allowable stress value,...and only flanges and fittings are specified by rating (such as 150#,..).So we should consider this difference when we are specifying piping materials.