Compression Fitting Makeup - CAIRE COMPANION 1000 Technical Manual

5.1.1
5-2 Service and Repair

Compression Fitting Makeup

The compression fittings used in the Companion 1000/T consist of a fitting body, tube,
ferrule, and nut (Figure 5-1). These fittings typically connect the aluminum tubing to
other components in the system. In a properly made-up compression fitting, sealing
occurs at two points: between the ferrule and the fitting body; and between the ferrule
and the tube.
Perform the following steps to make up a new compression fitting:
1. Inspect the tube end. The tube end should be cut square and the outside surface of
the tube should be free of scratches or other marks at least one inch (25 mm) back
from the tube end. Lightly buff the tube end with Scotch-Brite or fine emery paper
to remove any surface marks.
2. Insert the tube and make sure it is aligned squarely in the fitting body.
3. Make sure the tube end is bottomed against the tube stop in the fitting body. This is
necessary to prevent movement of the tube while the nut forces the ferrule to grip
the tube and create a seal.
4. Never permit the fitting body to rotate during make-up; use two wrenches. Always
hold the fitting body with a wrench while tightening the tube nut.
5. Always turn the tube nut the prescribed amount. With the tube against the tube
stop in the fitting body, tighten the tube nut finger-tight (Figure 5-2). For
diameter tubing, tighten the nut an additional 1
3
wrench. For / -in. diameter tubing, tighten the nut an additional
16
finger-tight with a wrench.
Companion 1000/T Liquid Oxygen System Technical Manual
ut
Tube
Ferrule
Figure 5-1: Compression Fitting
in. Tubing
1 turn from
finger-tight
Figure 5-2: Compression Fitting Make-up
Body
1
/ turns from finger-tight with a
4
3
/ turn from
4
-in. Tubing
¾ turn from
finger-tight
B-701964-00 Rev. C
1
/ -in.
4