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CHAPTER  2 GENERAL   PROCEDURES
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TM-750-116 Topographic Support System (TSS) Downsized Direct Support Section (DDSS) Manual
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TIME  CYCLES
TM  750–116 b. Setup for Two Stage Fixture (fig. 2–2). Figure 2–2 Setup for Two–Stage Fixture, PN   8565556 (1) Place a tank of dry nitrogen in a vertical position in the back of the fixture so that the tank is lodged in the structural steel “V” formation of the fixture and secure with the strap and clamping screw arrangement provided. (2) Secure regulator assembly to the tank. Make cer- tain  pressure  regulator  valve  is  turned  counterclockwise (CCW)  to  off.  Open  nitrogen  tank  valve  (CCW)  until  max- imum tank pressure is registered on the high pressure gage. NOTE If pressure indicated is less than 100 psi, obtain and use a replacement tank. (3) Connect hose assembly to regulator assembly. Open manifold valve. At no time should the pressure be permitted to exceed 15 psi. Pressure greater than 15 psi could damage the unit. (4) Open transfer valve by pulling it to the outermost position. (5) Close test fixture valve(s) and ensure low pressure gage indicates 0 psi. (6) Open  pressure  regulator  valve  clockwise  (CW) until low pressure gage indicates 15 psi. (7) Open test fixture valve(s) until test fixture gage(s) indicate(s)  proper  pressure. (8) Close manifold valve(s) and check pressure read- ing on test fixture gage(s) . (9) Remove stopper(s) from outlet pipe(s). Open manifold  valve(s)  and  check  the  pressure  on  test  fixture gage(s). Adjust fixture valve(s) if necessary. (10)  Close  manifold  valve(s)  and  attach  feeder  tube(s) to outlet pipe(s). (11)  For  bleed  down  procedures,  refer  to  para  2-3.b. 2-3.   BLEED   DOWN   OF   PURGING   AND CHARGING   EQUIPMENT   (fig.   2-1   and 2 - 2 ). DO NOT REMOVE REGULATOR ASSEM- BLY, ADAPTER, OR HOSE BEFORE FIRST PERFORMING ENTIRE BLEED DOWN PROCEDURE. INJURY COULD RESULT FROM SUDDEN RELEASE OF HIGH PRESSURE GAS. a. Bleed Down for Single Stage Fixture (fig. 2–1). (1) Close  pressure  regulator  valve  counterclockwise (CCW). (2) Close tank valve clockwise (CW). (3) Slowly open pressure regulator valve (CW) until low pressure gage and high pressure gage both indicate zero. (4) Close pressure regulator valve (CCW). Pressure regulator valve should be left in the closed position when not in use. Leaving valve in the open position could damage regulator diaphragm. b. Bleed Down for Two Stage Fixture (fig. 2-2). (1) Close  pressure  regulator  valve  and  test  fixture valve(s)  counterclockwise  (CCW). (2) Close tank valve clockwise (CW). (3) Open transfer valve by pulling it to the outermost position. (4) Rotate pressure regulator valve CW until low pres- sure gage indicates 15 psi. (5) With manifold valve(s) open, slowly rotate test fixture  valve(s)  CW  until  low  pressure  gage,  high  pressure gage and test fixture gage(s) indicate zero. (6) Close pressure regulator valve and test fixture valve(s) CCW. 2-2

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