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RE: copper tubing

To: "'Glenn Ridlen'" <>,
Subject: RE: copper tubing
From: "Albaugh, Neil" <>
Date: Wed, 10 Sep 2003 11:25:54 -0500

This is from an A&P Mechanics handbook:


...Generally, aluminum alloy or corrosion resistant steel tubing have
replaced copper tubing. The high fatigue factor of copper tubing is the
chief reason for its replacement. It becomes hard and brittle from vibration
and finally breaks, however it may be restored to its soft annealed state by
heating it red hot and quenching it in cold water. Cooling in air will
result in a degree of softness but not equal to that obtained with the cold
water quench. This annealing process must be accomplished if copper tubing
is removed for any reason. Inspection of copper tubing for cracks, hardness,
brittleness and general condition should be accomplished at regular
intervals to preclude failure. The workability, resistance to corrosion, and
lightweight of aluminum alloy are major factors in its adoption for aircraft

In some special high pressure (3,000 psi) hydraulic installations, corrosion
resistant steel tubing, either annealed or 1/4 hard, is used. Corrosion
resistant steel tubing does not have to be annealed for flaring or forming;
in fact, the flared section is somewhat strengthened by the cold working and
strain hardening during the flaring process. Its higher tensile strength
permits the use of tubing with thinner walls; consequently the final
installation weight is not much greater than that of the thicker wall
aluminum alloy tubing. "

You can probably use copper-- an LSR run is only for a short duration but
I'd check those lines frequently.

Regards, Neil     Tucson, AZ

-----Original Message-----
From: Glenn Ridlen [] 
Sent: Wednesday, September 10, 2003 8:02 AM
Subject: Re: copper tubing

Got to agree with Larry.... That's the way the instrument tubing guys did it
in the old days before we went to stainless. Now everything is electronic so
it's probably a lost art.

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