Determining the correct ASME class

[Mefi01]

Hi everyone,

I am looking at a system wich will be designed for an crude oil company which involves some pipelines,pumps, site instruments etc. I am now given the process information and was wondering if someone could help me work out weather ASME class 300 or 600 is required?

Operating Temperature: 80 - 120°F
Ambient Temperature: -5 / 55 °C
Operating Pressure: 100 – 600 psi
Vapour Pressure: 6 – 9 psi
Material: SS 316

 

[mk3223]

You may confirm the "Design P & T" of the system with the Process and Mechanical Disciplines, and then, determine the piping Class as defined by ASME B16.5 Code.

 

[LittleInch]

Look up the tables in asme b16.5 for that material.

You need to use DESIGN pressure not operating.They are not the same thing.

Probably close to class 600.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[gwalkerb]

316 is a group 2.2 material in B16.5, which gives you the following limits for temperature:
CL300: 720 psig @ 100F, 620 psig @ 200F, 560 psig @ 300F
CL600: 1440 psig @ 100F, 1240 psig @ 200F, 1120 @ 300F

So CL300 should work, however there are other reasons that you might want to use CL600 - it depends on the purpose of the system and what other components will be in it, especially relief valves.

What exactly is your role in this system design? If you are designing the piping system, you should be able to select a flange rating on your own. Usually someone (either your company or the customer), will have a piping specification which should give you standards for piping materials for any given application.

 

[racookpe1978]

What exactly is your role in this system design? If you are designing the piping system, you should be able to select a flange rating on your own. Usually someone (either your company or the customer), will have a piping specification which should give you standards for piping materials for any given application.

The OP has asked many very basic questions. To his credit, he has not claimed to be experienced and does admit he needs the knowledge.

He has not, by these questions, demonstrated his experience, background and training yet to be trusted with such a piping design task.