Soft Tubing To Hard Line??

[szicree]

I've got the standard issue plastic tubing for my static and instrument plumbing, but aluminum tubing for my wing pitot plumbing. What is the consensus for joining these two types of tubing?

[dan]

The clamps are apparently overkill and unnecessary, but whatever.

http://www.aircraftspruce.com/catalo...liconehose.php

[osxuser]

Thats an extra 3oz of weight Dan!

[robertahegy]

I used an AN fitting on the AL tube and a plastic fitting with ferrules to the plastic tube. Both went to NPT, one male and one female, joined together to form an adapter.

Roberta

[osxuser]

Yeah, thats probably how certfied airplanes would do it. I think those plastic ferrals are prone to leaking... after 25 years or so. You should be good for awhile.

[Sam Buchanan]

I used an AN fitting on the AL tube and a plastic fitting with ferrules to the plastic tube. Both went to NPT, one male and one female, joined together to form an adapter.

Yeah, thats probably how certfied airplanes would do it. I think those plastic ferrals are prone to leaking... after 25 years or so. You should be good for awhile.

The fuel tank vents in our old Warrior only had a short length of rubber hose connecting the aluminum tube coming out of the tank to the alluminum tube in the wing. No clamps, no AN fittin's, no nuthin' but a rubber hose.

That's the way it came from the factory.

Sam Buchanan (RV-6 with the pitot system plumbed with nylon and aluminum tubing joined with short lengths of non-clamped flexible tubing.....seven years and still tight...)

[osxuser]

But the vent doesn't have to hold any kind of pressure, thus it's a vent. Pressure lines are a different story. I do agree however that flexible hose is plenty for the Pitot, since it doesn't exactly run high pressure.

[RV_7A]

Im very curious and hope someone can tell me this. Any idea what type of pressure we are talking about in the pitot line at 200mph? 1, 2, 3 psi? I'm just looking for a close estimate.

-Jeff

[Sam Buchanan]

But the vent doesn't have to hold any kind of pressure, thus it's a vent. Pressure lines are a different story. I do agree however that flexible hose is plenty for the Pitot, since it doesn't exactly run high pressure.

I thought this thread was about pitot plumbing, not pressure hoses.

Try pulling one of the "rubber hose couplings" apart and you might start entertaining questions of just how much pressure it could potentially hold. The only way to get one of these connections apart is to cut it.

Sam Buchanan
http://thervjournal.com

[Kevin Horton]

Originally Posted by RV_7A

Im very curious and hope someone can tell me this. Any idea what type of pressure we are talking about in the pitot line at 200mph? 1, 2, 3 psi? I'm just looking for a close estimate.

200 mph CAS = 0.7 psi pitot pressure, roughly speaking.