Quantcast Purge  and  Charge  -  Inlet  Port  Entry,  Outlet Port Screw(s)

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TM-750-116 Topographic Support System (TSS) Downsized Direct Support Section (DDSS) Manual
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Purge Only, Inlet Port Entry, Outlet Port Screw
TM  750–116 (7) Purge instrument for specified time. If moisture is still present, a longer purge time may be required. (8) Close  the  regulator  valve  (CCW). (9) Watch  low  pressure  gage  and  listen  for  purge  re- lief valve to close. (a) Relief valve should close at specified pressure. (b) If pressure relief valve does not close before reaching the lowest pressure indicated, replace the pressure relief  valve  and  repeat  procedure. (10) Leak test by allowing instrument to stand for specified time. (a) Watch low pressure gage for indication of nitro- gen leaks. (Low pressure gage will indicate decreasing pressure.) If no leak is indicated, go to step 11. (b) If pressure reduces, perform leak check: — Apply a soap solution to all sealed joints and screws. —  Open  regulator  valve  (CW)  until  specified pressure registers on low pressure gage. When pressure relief valve opens, close regu- lator  valve  (CCW). — Watch for bubbles to appear around seals and screws. — Refer to appropriate maintenance manuals to replace defective seals. — When defective seals are replaced, repeat purge and charge procedure. (11) If no leaks are found on instrument, perform leak test on purge kit and hose connection while still connected to instrument. Repeat procedure until all leaks are elimi- nated. (12) Remove hose assembly. (13) Close main tank valve (CW). Apply soap solu- tion to the valve core. If a Ieak is found, replace valve core of instrument and repeat purge and charge procedure. (14) Install inlet port cap on instrument. (15) For bleed down procedures, refer to para 2-3. b.  Purge  and  Charge  -  Inlet  Port  Entry,  Outlet Port Screw(s) This procedure is used when instrument is designed to hold a charge. HANDLE  WITH  CARE.  IN  THE  EVENT THE RADIOLUMINOUS SOURCE IS BROKEN,  CRACKED,  OR  SUDDENLY LOSES ILLUMINATION, DO NOT AT- TEMPT  TO  REPAIR.  IMMEDIATELY WRAP DEVICE IN PLASTIC AND NOTIFY  THE  LOCAL  RADIATION  PRO- TECTION  OFFICER  (RPO). (1) Remove inlet port cap of instrument to be purged and  charged. (2) Inspect valve stem for cleanliness and presence of valve core. Remove any dirt or foreign matter. Ensure regulator valve is closed (counter- clockwise - (CCW) or damage may occur to regulator. To avoid damage to instruments being purged and charged, do not exceed maxi- mum pressure. Unless otherwise noted for specific instrument, maximum pressure is 10 psi. (3) Connect hose assembly to valve stem on instru- ment. (4) Open main valve on nitrogen tank (CCW). (5) Remove  outlet  port  screw(s)  (unless  otherwise directed for specific instrument) and any accompanying gasket/preformed   packing. (6) Open regulator valve clockwise (CW) until speci- fied purge pressure is indicated on low pressure gage. (7) Watch low pressure gage and listen for gas escap- ing from outlet port. Do not allow pressure to exceed maxi- mum  specified  pressure. (8) Purge instrument for specified time. If moisture is still present, a longer purge time may be required. (9) Reduce pressure to 1 psi. 2-4

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