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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 Screw, Outlet Port Screw(s)
TM  750-116 (10) Check outlet port screw to ensure seal on screw is  serviceable.  Replace  self-sealing  screw  if  necessary.  If other than self-sealing screw is used, sealing compound, (item 6, appx B, unless otherwise specified) must be applied to screw before installing. (11) Install outlet port screw(s) and any accompany- ing gasket/preformed packing. (12) Increase  pressure  to  specified  charge  pressure  for specified time. (13)  Close  regulator  valve  (CCW). (14)  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 pres- sure). If no leaks occur, proceed to step 15. (b) If  pressure  reduces,  perform  leak  check: - Apply a soap solution to all sealed joints and screws. - Open regulator valve (CW) to increase internal pressure  to  instrument’s  charge  pressure. -  Close  regulator  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. (15) If no leaks are found on the instrument, perform a leak test on the purge kit and hose connection while still connected to the equipment. Repeat procedure until all leaks are eliminated. (16)  Remove  hose  assembly. (17) Close  main  tank  valve  (CW).  Apply  soap  solu- tion to valve core. If a leak is found, replace valve core of instrument and repeat purge and charge procedure. (18)  Install  inlet  port  cap  on  instrument. (19) For bleed down procedures, refer to para  2-3. c. Purge Only, Inlet Port Entry, Outlet Port Screw.  This procedure is used when instrument does not 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 DOUBLE WRAP INSTRUMENT IN PLAS- TIC AND NOTIFY THE LOCAL RADI- ATION PROTECTION OFFICER (RPO). (1) Remove  inlet  port  cap  from  instrument  to  be purged. (2) Inspect  inlet  port  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, do not exceed maximum pressure. Unless otherwise noted for specific instru- ment, maximum pressure is 10 psi. (3) Connect hose assembly to inlet port valve stem on instrument. (4) Open  main  valve  on  nitrogen  tank  (CCW). (5) Remove  outlet  port  screw  (unless  otherwise  di- rected for specific instrument) with any accompanying gas- ket/preformed packing. (6) Open  regulator  valve  (clockwise  -  CW)  until  spe- cified 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) Close  the  regulator  valve  (CCW). 2 - 5

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