ASME B-31 and Aerospace applications

[cbreay]

I’m looking for references and technical information relating to thin wall tubing systems; specifically Aerospace Fluid Delivery Systems. I’ve seen many references to ASME B-31. Before I spend $300 on the specification, can anyone tell me if this specification would shine light on theories that could be applied to thin-wall tubing? Does this specification address analysis techniques for initial sizing? Any advice is greatly appreciated.

-cbreay
Denver, Colorado

 

[1969grad]

No. Theories and analysis techniques are not included as it is a piping code and not a textbook or handbook.

For allowable operating pressures, tubing fittings, etc. see

http://www.swagelok.com

for example.

 

[prex]

If by thin wall tubing you mean pipes (or tubes) made out of special materials with properties enhanced by cold working, then I confirm: don't waste your money.
If you use common materials (e.g.SS) then you could get at least the formulae for calculating wall thicknesses, but once again I wonder whether you use the same allowables as the codes, and that's the main point where you need the code to design a piping system.
So once again don't think you'll find the code useful.

The above holds if your tubing is going to fly. If it is part of a ground system, then you should normally design it according to a B31 or similar code.

prex

http://www.xcalcs.com

Online tools for structural design

 

[cbreay]

Thanks for the responsive insight. Your support is appreciated.
Happy Holidays!

-cbreay

 

[aviat]

It depends on where the line is located and what fluid is being transported. For instance most lines in engine compartments must be fire proof and often fuel lines must be shrouded. It also depends on the type of A/C you are designing for. For this reason you will have to consult the FAA or other regulations to determine what applies and from there determine material. Material could be SS, 5056 Al or others. After that you can work with suppliers for wall thickness etc. because they may be limited. You may also use MIL-HDBK-5 as a guide for material.

Below is the site to Aeroquip's design handbook

http://www.aerospace.eaton.com/pdfs/aeroquip/tube_bend_rule.pdf