TM 5-4220-211-12&P
case, the air surrounding the prefilter is sampled. In the second case, a quantity of air may be collected into a plastic bag
from the fill hose and manifold. This air is then drawn into the test tube and the resultant color change compared to the
appropriate color charts to determine the breathing air quality.
1-10. COMPRESSED AIR PURITY. The standards given in Table 1-1 are considered safe for human consumption and
for use in divers breathing apparatus.
Section IV
LEADING PARTICULAR
Table 1-2. COMPRESSOR
No. of Cylinders
3
No. of Stages
3
Working Pressure
Cylinder Bore
1st Stage
3.465" (88 mm)
60-80 PSIG (4-5.5 BAR)
2nd Stage
1.417" (36 mm)
50-600 PSIG (34.5-41.0
BAR)
3rd Stage
0.551" (14 mm)
3200 PSIG (220 BAR)
Stroke
1.575" (40 mm)
Speed
1300 RPM (max)
Delivery Rate
5 SCFM (min)
Minimum Ambient Temp.
-250 F (-32 C)
Maximum Ambient Temp.
1100 F (430 C)
Discharge Air Temp.
1350 F (571 C) (max)
Maximum Allowable
Compressor Inclination
150 in any direction
Dimensions Length
42 (1066.8 mm)
Width
18" (457.2 mm)
Height
24" (609.6 mm)
Weight
275 lbs (125 KG)
Table 1-3. DIVER TANK BLOCK
No. of Cylinders
2
Tank Material
Aluminum
Tank Capacity
80 SCF @ 3000 PSIG, 70F
Reserve Tank Capacity
500 PSIG
1-7
