Table 10-14.--Minimum Inside Diameter of Tubing
TUBE
6061 ALUMINUM
1/8 HARD STAINLESS
ANNEALED STAINLESS
OUTSIDE
DIAMETER
WALL
MIN ID
WALL
MIN ID
WALL
MIN ID
1/8
0.020
0.060
0.016
0.070
0.020
0.060
3/16
0.028
0.095
0.018
0.110
0.020
0.115
1/4
0.035
0.150
0.020
0.165
0.028
0.155
5/16
0.049
0.180
0.022
0.225
0.035
0.225
3/8
0.049
0.240
0.025
0.290
0.049
0.270
1/2
0.065
0.330
0.028
0.400
0.058
0.380
5/8
0.083
0.420
0.035
0.485
0.065
0.475
3/4
0.095
0.530
0.042
0.610
0.083
0.590
1
0.065
0.830
0.065
0.840
0.083
0.800
All measurements are in inches.
temperature specified in the manufacturing instruc-
Oxygen tubing should be tested using dry nitrogen and
tions is reached. Tube assemblies must be blown
inspected for leaks while the tubing is submerged in
clean and dried with a stream of clean, dry,
water.
water-pumped air.
Cleaning Tubing and Tube Assemblies
All tubing and tube assemblies must be cleaned
CAUTION
after fabrication to prevent contamination of the system
Oil-pumped air is not a suitable substitute
in which they will be installed. Dry-cleaning solvent
for water-pumped air because it causes oil to be
MIL-PRF-680, Type II, is the preferred cleaner.
deposited in the tube assemblies. Oxygen reacts
Oxygen system tube assemblies require special
violently with oil and may cause equipment dam-
precautions for cleaning. After fabrication, and testing,
age and injury to personnel. Oxygen (BB-O-925)
clean oxygen tube assemblies in accordance with
or clean, dry, water-pumped nitrogen (BB-N-411)
MIL-STD-1330D. If a vapor degreaser is not used, tube
must be used in place of water-pumped air.
assemblies must remain in the vapor degreaser until the
10-35
