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Purge Only, Inlet Port Entry, Outlet Port Screw
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TM-750-116 Topographic Support System (TSS) Downsized Direct Support Section (DDSS) Manual
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CHAPTER  3 PURGING AND CHARGING SPECIFIC INSTRUMENTS
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  with  any  accompanying gasket/preformed   packing. (12) Remove  hose  assembly. (13)  Install  inlet  port  cap. (14) For bleed down procedures, refer to para  2-3. d. Purge Only - Inlet Port Screw, Outlet Port Screw(s).  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  screw  from  instrument  to  be purged. (2) Inspect  inlet  port  for  cleanliness.  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) Install specified purge adapter in inlet port. (4) Connect hose assembly to purge adapter on the instrument. (5) Open main valve on nitrogen tank (CCW). (6) Remove  outlet  screw(s)  (unless  otherwise  directed for specific instrument) and any accompanying gasket/pre- formed  packing. (7) Open  regulator  valve  (clockwise  -  CW)  until specified  purge  pressure  is  indicated  on  low  pressure  gage. (8) Watch low pressure gage and listen for gas escap- ing from outlet port(s). (Do not allow pressure to exceed maximum  specified  pressure. (9) Purge  instrument  for  specified  time.  If  moisture  is still present, a longer purge time may be required. (10) Close  the  regulator  valve  (CCW). (11) Check  inlet  and  outlet  port  screws  to  ensure seals on screws are serviceable. Replace self-sealing screws if necessary. (If other than self-sealing screws are used, sealing compound (item 6, appx B, unless otherwise specified) must be applied to screw before installing. (12) Install  outlet  screw(s)  and  any  accompanying gasket/preformed  packing  (if  required). (13) Remove  hose  assembly  and  adapter. (14)  Install  inlet  screw. (15) For bleed down procedures, refer to para  2-3. 2-6

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