Thin walled tubing pressure test spec needed
Thin walled tubing pressure test spec needed
(OP)
I am designing a ground air-conditioning duct out of .035 inch wall, 5 inch I.D. 6061-T4. Operating pressure is 13 psig. Per 14 CFR 25.1438, I need to proof test to 1.5X and burst test to 2X normal operating pressure. I have looked but can't find an AMS, ANSI, or other specification that covers pressure testing of thin walled aluminum tubing.
Any thoughts?
Any thoughts?





RE: Thin walled tubing pressure test spec needed
RE: Thin walled tubing pressure test spec needed
RE: Thin walled tubing pressure test spec needed
Para 3.2.6 spells out the requirement.
RE: Thin walled tubing pressure test spec needed
RE: Thin walled tubing pressure test spec needed
RE: Thin walled tubing pressure test spec needed
Anyway just my 2 cents, not sure it helps you.
RE: Thin walled tubing pressure test spec needed
RE: Thin walled tubing pressure test spec needed
I'm a bit curious: why design a ground air-conditioning duct out of .035 inch wall, 5 inch I.D. 6061-T4... when flexible or semi-rigid ducting is commonly used in this application [SAE AS38386, NAS1370--1379, SAE AS38386, AS150*, AS8796, etc]?
For instance... the AS38386 Duct Assembly, Ground, Conditioned Air, Insulated, Flexible... are intended for this very application: they also have insulation, are tough and damage resistant, come in various pressure ratings and a variety of materials.
There is also metal hose available if needed.
Be careful: 0.2thin aluminum ducting may be great weight savings in aircraft installation... but in GSE may prove to be flimsly... and needing a jacket for damage protection and thermal/acoustical insulation; etc...
Regards, Wil Taylor
RE: Thin walled tubing pressure test spec needed
RE: Thin walled tubing pressure test spec needed
I stand corrected... although flexible hose might still be an option to consider... especially when insulation jacketing of the duct is needed [like a metal AC duct].
For giggles... are You designing this installation with the following specs in mind ??? NOTE: these docs have lots of embeded design references.
SAE ARP85(E) Air Conditioning Systems For Subsonic Airplanes.
SAE ARP217(D) Testing of Airplane Installed Environmental Control Systems (ECS)
or... very harsh design criteria of bleed air systems...
ARP1796(A) Engine Bleed Air Systems for Aircraft
Info...
AIR5378 Aircraft Tube Bending Methods, Techniques and Tooling
Regards, Wil Taylor