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Page Title: RECHARGE - DRY CHEMICAL EXTINGUISHER CONT.
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APPENDIX A INSPECTION/MAINTENANCE To   Inspect/maintain   the   dry   chemical   and   Halon 1211 extinguishers: 1. Check   that   pointer   on   extinguisher   pressure gauge is in the GREEN operating range.  (Upper and  lower  point  of  operating  range  reflects  the operating temperature range of the extinguisher.) CAUTION:  The operating pressure of the Halon 1211 extinguisher varies with temperature.          A     Halon     1211 stored  pressure  extinguisher  shall be recharged if a loss in pressure occurs,  adjusted  for  temperature, exceeding   10%   of   the   charging pressure.      If   a   pressure   loss   is suspected, condition the extinguisher at 70 OF (21 OC) for 12   hours   and   then   recheck   the pressure   reading.      If   gauge   still shows  a  10%  pressure  loss,  the extinguisher must be recharged. 2. Check  the  visual  inspection  seal  on  metal  ring pin models.  Check that the barb is intact on pull pin models. 3. If  the  extinguisher  has  a  window  (as  shown)  a metal  tab  should  extend  through  that  window. The tab restricts operating movement to protect the  valve  stem.    If  the  tab  is  bent  or  missing, visually  inspect  the  valve  stem  (by  lifting  the operating lever) and repair or replace components as required. 4. Inspect  the  hose  and/or  nozzle  for  damage  or obstructions. 5. Weigh   the   extinguisher.      The   total   charged weight    is    printed    on    the    nameplate.        The extinguisher     shell     should     be     checked     for damage  or  corrosion  and  treated  as  outlined  in NFPA 10. 6. Record date of inspection/maintenance. A8-5

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