Piping Specification
Piping Specification
(OP)
Hello everybody!
Appreciate your help as I have few questions in my mind regarding Piping Specification...
1. How one can decide the maximum and minimum size for a specific fluid/medium. May be based on Client requirements but not exactly.
2. How to find the relevant material group in ASME B16.5 given the base material. This group can be decided whenever there are P-T limits as provided in Client specification but what if not given.
Please give your valuable thoughts and share the info with each.
Regards
PME
Appreciate your help as I have few questions in my mind regarding Piping Specification...
1. How one can decide the maximum and minimum size for a specific fluid/medium. May be based on Client requirements but not exactly.
2. How to find the relevant material group in ASME B16.5 given the base material. This group can be decided whenever there are P-T limits as provided in Client specification but what if not given.
Please give your valuable thoughts and share the info with each.
Regards
PME
Hard Work with Smartness is the key to success





RE: Piping Specification
RE: Piping Specification
Min - the smallest size you need for instrument connection
Material to be used is the cheapest you can that meets the process requirement
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Piping Specification
As LI states sizing will come from process design who will do the hydraulics but in practice your Piping Specification should cover all the standard sizes up to the largest expected in project therefore changes in initial sizes can be accommodated without having to re-issue specification.
Material should be based on Material Selection Report and Material Selection Diagrams (MSD) with MSD including stream data from where you can then specify the piping class by material and pressure e.g. Class 150, Class 300 etc and also determine wall thickness based on P/T limits in B16.5. Note that for Class 150 you should include Class 300 flanges which are likely to be required to match Control Valves or sometimes equipment connections which are minimum Class 300.
RE: Piping Specification
2. Not sure I fully understand the question; are you trying to pick flange material to match the base pipe material, or is it just a matter of interpreting the flange material groupings within B16.5?
RE: Piping Specification
Regards
Hard Work with Smartness is the key to success
RE: Piping Specification
This is very simplified but hope it helps.
RE: Piping Specification
It feels good to open eng-tips after a long time. Hope you all are doing good.
Now, regarding this post, I think MickMc has explained very clearly. Generally, process engineer specifies the material to be used. There is usually a document called "fluid list" that mentions the material to be used against every service. Piping material engineer prepares piping material specifications based on this fluid list. The rating of PMS is derived from ASME B16.5 based on pressure temperature ratings.