TM 1-1500-204-23-2
(c) Tube-to-tube connections. To make a
tube-to-tube connection, the tube B-nut is tightened until
a definite resistance is felt and is then turned one-sixth
of a turn farther. The upper wrench is held stationary
while the lower wrench is moved upward until the B-nut
is tightened a sufficient amount (see figure 4-22). On
this tube connection, like most others, a 1/8-inch colored
stripe may be painted across the completed assembly
so that loosening can be readily detected (see figure
4-23).
(4) Bulkhead fitting installation. These fittings
are used for connecting tubing to components of the
system, and for connecting sections of tubing where the
line passes through a bulkhead and the fitting is secured
to the bulkhead, as shown in figure 4-24. Refer to table
4-4 for the correct fitting size.
(a) Hand presetting of MS21922 sleeve.
The MS21922 sleeve can be preset using the following
procedures:
1 Bottom the tube end firmly In the seat of
the preset tool or fitting.
2 TightentheMS21921 nut1 1/6 turns past
the point of ring grip on all sizes and materials for all
types of fittings or tubes.
Figure 4-19. MS Fitting Gasket Installation
(b) Resetting (Installation). Tighten the
MS21921 nut in accordance with table 4-5.
(c) Boss installation of MS33514 fitting end,
style E. This fitting can be Installed as follows
1 Lubricate the packing in appropriate lie-
id (refer to table 4-6).
2 Install packing on the fitting as shown In
detail A, figure 4-25
3 Screw the fitting assembly into the boss
using installation torque In accordance with table 4-7
(d) Installation of AN 924 jamnut. Torque
values can be found In table 4-8.
b. Oxygen System Tapered Pipe Thread.
Tapered pipe thread fittings are a versatile and efficient
method of connecting tubing to components.
(1) Tubing fittings tapered pipe threads. Pipe
threads should conform to MIL-P-710-5. Straight thread
and tapered pipe thread are shown In figure 4-26.
NOTE
When installing pipe thread fittings, fittings
should be tightened but not enough to
damage threads or crack the part In which
fitting is being Installed.
Figure 4-20. Tubing Alignment
4-17
