Outward Leakage Test (Supply System) The outward leakage test (fig. 11-1) is performed as follows: 1. Ensure the supply cylinder valve and all test stand valves are closed. 2. Open fully, then close the supply cylinder valve. 3. Note the pressure registered on gauge (9). After 2 minutes, reread the pressure on gauge (9). There should be no pressure drop (a drop in pressure indicates leakage). Outward Leakage Test (Regulated High-Pressure System) The outward leakage test is performed as follows: 1. Cap connection (18) in chamber. 2. Open supply cylinder valve. 3. Turn regulator (Q) to LOAD, and hold until 2,000 psig (or cylinder pressure) is indicated on gauge (10). The regulated low-pressure gauge should indicate the gauge guard cut-off pressure, 170 ± 5 psig.) 4. Close the supply cylinder valve and note the pressure on gauge (10). After 2 minutes, reread gauge (10). There should be no pressure drop (a drop in pressure indicates leakage). NOTE: If pressure is registered on gauge (27), a leak is indicated in ON/OFF valve (L) or ON/OFF valve (G). A pressure drop on gauge (11) also indicates valve (G) is leaking. Valve (G) will be independently tested later. Bleed pressure by turning (Q) to VENT. Open valve (S) to bleed system, then close valve (S). Outward Leakage Test (Regulated Low-Pressure System) The outward leakage test is performed as follows: 1. Open the supply cylinder valve. Turn the selector valve (F) to HIGH and the selector valve (D) to Hg. 2. Turn the ON/OFF valves (L) and (G) to ON. 3. Slowly turn the regulator (N) clockwise until 70 psig is indicated on gauges (1 1) and (27). 4. Return valve (L) to OFF and observe rotameter (8). Any leakage will be indicated by the ball rising in the rotameter tube. There should be no leakage. 5. Turn valve (F) to LOW RANGE position and observe rotameter (7). There should be no leakage. 6. Return valve (F) to HIGH RANGE, and valve (L) to ON. 7. Slowly adjust the regulator (N) until 160 psig is registered on gauge (11). Gauge (27) should indicate its gauge guard cut-off pressure of 145 ± 5 psig. 8. Turn the ON/OFF valve (L) to OFF and observe rotameter (8). There should be no leakage indicated. 9. Turn the selector valve (F) to LOW RANGE and observe rotameter (7). There should be no leakage indicated. 10. Decrease the pressure to 70 psig by open- ing valve (S), and turning regulator (N) in a counterclockwise direction. Leakage Control Valve (E) and Leakage ON/OFF Valve (G) Tests Perform leakage control valve and leakage ON/OFF valve tests as follows: 1. Connect a hose from connection (19) to tap (20) in the chamber, and observe rotameter (6). There should be no leakage indicated. 2. Turn the ON/OFF valve (G) to OFF and remove the cap from connection (18) in chamber. 3. Observe rotameter (7). There should be no leakage indicated. Suit Simulator System Leakage Tests Perform leakage tests on the suit simulator system as follows: 1. Open the shutoff valve (R) and valve (J) fully. Place the selector valve (0) to the ALT CHAMBER, and valve (M) to the suit simulator position. 2. Remove the hose from tap (20) and connect it to tap (21) (connecting connection (19) to tap (21)). Cap piezometer (26). 3. Place selector valve (D) in the H₂O position, and valve (F) in the HIGH RANGE position. 11-11