Tapered Pipe Thread Troubleshooting; Side Covers; Removal - CAIRE COMPANION 1000 Technical Manual

5.1.5
5.2

SIDE COVERS

5.2.1
5-4 Service and Repair
3. Assemble the fittings and tighten until snug. Since NPT fittings have tapered
threads, torque requirements increase as the fittings are tightened. Tighten NPT
fittings until a you achieve a good seal (usually a minimum of three turns). Do not
overtighten NPT fittings. Overtightening may result in cracked fittings.
Some NPT connections require alignment of one of the fittings in a certain
orientation. Do not back out the fitting if you are unable to achieve the proper
orientation as you tighten the fitting. This will typically result in a leak.
Disassemble and remake the fittings instead.

Tapered Pipe Thread Troubleshooting

Leaks at NPT fittings are usually the result of improper application of thread sealant or
loosening of the fittings. To check for leaks, pressurize the system and use an oxygen-
compatible leak detector (such as SNOOP) on the fitting threads. If bubbles appear,
disassemble the fittings and remake (Section 5.1.4, Tapered Pipe Thread Make-Up).
The Companion 1000/T side covers are molded polycarbonate components. When
assembled, they form a clamshell-like enclosure for the Companion 1000/T. Side cover
A has threaded inserts that receive retaining screws from side cover B, as well as
retaining screws for the bottle assembly. The bottom of side cover A also has a clearance
hole for the vent tube and a pad for mounting one of the rubber feet. The Companion T
has a label affixed to the front of side cover A that reads "COMPANION T". Side cover
B has five holes for the retaining screws, a clearance hole for the male fill connector and
pads for mounting three rubber feet.
Refer to Figure 6-1 or 6-2 to identify parts with bold number references.

Removal

1. Remove the moisture cup (Companion T) by turning the quarter-turn fastener
counter clockwise and pulling the cup away from the unit.
2. Place the unit on its side with side cover "B" 12 facing you. Use a
wrench to remove five socket head cap screws 13, 15, 17 and 18 located underneath
the vent valve lever and in the corners of side cover B.
3. Carefully separate side cover B 12 from side cover A 31.
-in. Allen wrench to remove the two socket head cap screws 20 and the two
4. Use a 7 /
64
lockwashers 21, located in the tabs on the bottom of the container.
Companion 1000/T Liquid Oxygen System Technical Manual
Figure 5-4: Applying Teflon Tape
7 / -in. Allen
64
B-701964-00 Rev. C