TM 1-1500-204-23-2
Figure 4-33. Repairing High-Pressure Tubing
be made of aluminum alloy conforming to Federal
Specification WW-T-700/4.
NOTE
Copper tubing of same outside diameter and
wall thickness may be used in oxygen sys-
tems only In case of emergency, and should
conform to Federal Specification WW-T-799,
Type N. Steel tubing shall not be used be-
cause it loses its ductility and becomes brittle
at low temperature.
(a) Tubing material. When replacing a
damaged tubing assembly, the same size and material
shall be selected. Where like materials are not available,
wall thickness which can be used for various diameters
and tubing materials under applicable system pressure
are shown in table 4-11. The following paragraphs
explain the use of this table.
1 Explanation of codes. The following
information applies to the code symbols The codes
shown in table 4-11 indicate that these sizes are stand-
ard.
TUBING
CODE
MATERIAIL
SPECIFICATION
a
Aluminum
5052-0
FED SPEC WW-T-700/4
b
Aluminum
2024T
FED SPEC WW-T-700/3
c
Corrosion-
Resistant Steel
Annealed
MIL-T-8504
d
Corrosion-
Resistant Steel
1/4 hard
MIL-T-6845
2 Minimum burst pressures. In accord-
ance with MIL-H-5440, the following minimum tube
burst pressures are required for the noted system pro-
cedures:
SYSTEM PRESSURE
BURST PRESSURE
1,000
4,000
1,500
6,000
3,000
12,000
3 Conversion factors Following are the
conversion factors for the materials in table 4-1 1 and the
three system pressures.
MATERIAL SYSTEM
CONVERSION
CODE
PRESSURE (PSI)
FACTOR
a
1,000
1,380
1,500
2,070
3,000
4,140
b
1,000
625
1,500
938
3,000
1,875
c
1,000
533
1,500
800
3,000
1,600
d
1,000
333
1,500
500
3,000
1,000
4-31
