Piping and Valve Material Selection

Go back to the organisation that published that particular standard, and ask there, including the individuals who did the telling.

You are asking beginner questions.

There are more subtle issues when designing B31.1 piping systems.

Piping systems must be designed based on

- Pressure design ( including shock and dynamic effects)

- Flexibility analysis, Deadload analysis

- Nozzle reactions on equipment

- Pipe support selection, location and loading on the piping system

- Corrosion, internal and external

etc...etc...etc..

Purchase the "Piping Handbook" and other books on piping design and begin to read.

Piping system design is not a simple matter that can be boiled down into a couple of "thumb rules"

Hey, thanks, for the interest shown.

I have been reading Piping handbook and a material selection guide, still question is unanswered.

I'm not understanding, why people assume material from very beginning of design and proceed for thickness (essential to withstand the pressure) calculation ??

any comments ??

If you want to look for specific material for pipe, you have to look at the TAble A-1 of Appendix A in ASME B31.1 or code you apply. There are a plenty range of teperature for each material pipe; but allowable stress decrease if temperature increase.

A106 Gr.B is the most common material in pipe industry, but if you have speccial requirements, it's necessary to conduct a special study for the fluid (solids, content of Cl, H2S, NH2, H2O, etc). Then the metallugic specialist can determine the right material, also you have to know the lifetime of facility.

Regards