SECTION III. PRINCIPLES OF OPERATION

Figure 1-4. Servicing Unit Flow Schematic, Sheet 1 of 2.

TM-5-4220-233-14 Trailer Mounted Type I Manifold Servicing Unit Trailer Mounted Type II Manifold Servicing Unit Oxygen Booster Pump Oxygen Charging Station Manual
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TM 5-4220-233-14 SECTION III. PRINCIPLES OF OPERATION Paragraph Page 1-13 Principles of Operation .......................................................................................1-11 1-13. PRINCIPLES OF OPERATION. NOTE Reference desiginators are used for clarification purposes only; however, they are not Identified on the equipment The mobile compressed gas Servicing Unit is used to fill SCUBA cylinders with breathing air. The Servicing Unit consists of a trailer assembly and a body assembly. a. Body Assembly. The body assembly is bolted to the trailer and can function while mounted on the trailer or can be removed from the trailer and operated independently. The body assembly consists of an aluminum frame which provides the mounting provisions for the Compressed Gas System storage cylinders and control panel and accessory components including a trough, and a tool box/ (1) Compressed Gas System. The Compressed Gas System consists of eight large storage cylinders (Cylinders #1 through #8) capable of storing breathing air at 5000 psig. Figure 1-4 depicts an operational schematic of the system air flow described in the following paragraphs. Each storage cylinder has a shutoff valve (MV100 through MV107) connected to its outlet port that isolates the pressure in each cylinder from the rest of the system. Flexible hoses connect the storage cylinders to a high pressure manifold (MAN 100) mounted on the control panel. The high pressure manifold directs the flow of air to the storage cylinders when filling the Servicing Unit or to the low pressure manifold (MAN 200) when filling SCUBA tanks. (a) Each of the eight flow paths from the storage cylinders to the high pressure manifold also contain a 1/4-turn ball valve (MV108 through 115) and a 0-6000 psig cylinder pressure gauge (Pl100 through PI107). A recharge station is connected at the Inlet to the manifold with a recharge valve (MV116) and a connection port. This station Is used when refilling the storage cylinders. (b) At the outlet of the high pressure manifold, the manifold valve (MV117) Is provided to Isolate high and low pressure portions of the system. Down stream of this valve, air passes through a 90 micron particulate filter (F100). The air is, then, diverted to the high pressure valve (MV119) or to a pressure regulator (PR100). The pressure regulator(PR100) is used to control the fill pressure of the SCUBA cylinders. Two 0-6000 psig pressure gauges (PI108) manifold pressure gauge and (P1109) servicing pressure gauge are connected to the pressure regulator for monitoring the inlet and outlet pressure. Downstream of the pressure regulator the servicing valve, (MV118) isolates pressure to the low pressure manifold. (c) The low pressure manifold directs pressure to four fill stations (#1 through #4). The fill stations can be used independently or simultaneously. Each fill station contains a fill station valve (MV200 through MV203) and a outlet port that connects to 15 foot long flexible fill hoses. The fill hoses have a yoke adaptor (YFA200 through YFA203) at the outlet that can be connected to SCUBA cylinders with either "J" or "K" type connections. The low pressure manifold is also connected to the bleed off valve (MV204) that is used to bleed pressure from the system once the SCUBA cylinders are filled. Each manifold contains a relief valve (RV100 and RV200). The storage cylinder valves, also, contain relief devices to vent excess pressure overboard, if the air pressure exceeds safe levels. 1-11

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