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Figure 2-6.  Servicing SCUBA cylinders
Figure 2-7.  Shutdown Procedures.

TM-5-4310-387-14 Compressor Unit Diesel Engine Driven 20 CFM 3200 PSI Model K-20-D Manual
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TM 5-4310-387-14 Table 2-2.  SCUBA Cylinder Charging Capacities. Air Capacity Outside Open-Circuit Internal at Rated Reserve Dimensions Cylinder Rated Working Volume Pressure Pressure2 inches Description Pressure (psig) (cu ft) (cu ft) (psig) (dia.)    (length) Steel 72 2250 0.422 65.0 500 6.80    25.00 Aluminum 50 3000 0.281 48.5 500 6.8      19.00 Aluminum 63 3000 0.319 65.5 500 7.2      21.75 Aluminum 80 3000 0.392 80.4 500 7.2      26.00 Aluminum 90 3000 0.398 81.6 500 7.7      26.50 Aluminum 92 3200 0.434 95.0 500 8.0      24.75 Aluminum 100 3300 0.467 105.3 500 8.0      26.20 1 Numerals  refer  to  approximate  air  capacity  in  cubic  feet  at  rated  working  pressure.    Fifty  cubic  feet  is  the minimum size SCUBA cylinder authorized. 2 Single cylinder equivalent.  Acceptable reserve actuation pressure ranges are: a. Single cylinder minimum of 450 psig. b. Double cylinder minimum of 225 psig. NOTE Before use, the reserve valve knob should be in the up position. (10)     Open the vent valve (8) to relieve pressure. (11)     Loosen screw handle (5) and remove filler adapter (3). (12)     If more cylinders are to be refilled, repeat steps 3 through 11. (13)     Install duct cap in filler adapter (3) and tighten. (14)     Shut down compressor (para. d.). d. Compressor Shutdown Procedures.  (figure 2-7) (1)     Push the speed control lever (1) down to IDLE position. (2)     Vent  the  unit,  by  means  of  the  bleed  valve  (2)  on  the  filler  adapter  (3),  until  the  pressure  is  reduced  to approximately 700 PSI.  Close bleed valve (2). 2-16







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