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Figure 2-47.  Element Cleaning Switch
OPERATING PROCEDURES - TM-10-4610-239-10_93

TM-10-4610-239-10 Water Purification Unit Reverse Osmosis 600 GPH Trailer Mounted Flatbed Cargo 5 Ton 4 Wheel Tandem Model 0996109001 Manual
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TM 10-4610-239-10 TM 08580B-10/1 2-24. SAFETY  VALVES.    The  ROWPU  has  three  automatic  safety  devices:  the  high-pressure  relief  valve,  the  high- pressure switch, and the rupture disc assembly. a. The  HIGH  PRESSURE  RELIEF  VALVE  is  located  just  behind  the  PULSE  DAMPENER  VALVE.    If  R.O. pressure  goes  above  1100  psi,  this  valve  opens  automatically  and  discharges  water  through  a  pipe  at  the  back  of  the ROWPU.  If this valve activates (indicated by sudden pressure loss), immediately press the PUSH EMERGENCY STOP switch.  Open REGULATE PRODUCT FLOW VALVE after unit is shut down.  When the pressure drops below 1100 psi, the valve will close automatically. Figure 2-49.  High Pressure Relief Valve and Rupture Disc CAUTION If the valve does not close automatically, notify unit maintenance and do not try to restart the ROWPU. After the HIGH PRESSURE RELIEF VALVE closes, clean the R.O.  elements (see para.  2-28) and start the ROWPU in the normal manner (para.  2-25). b. The  HIGH  PRESSURE  SWITCH  is  mounted  to  the  rear  of  the  front  panel  adjacent  to  the  PANEL  LIGHT. The HIGH PRESSURE SWITCH activates above 1250 psi.  If the HIGH PRESSURE SWITCH activates, the R.O.  pump will  automatically  shut  down  and  the  HIGH  PRESSURE  LAMP  (blue)  will  come  on.    When  the  pressure  drops,  use  the RESET SWITCH to reset high pressure switch.  Notify unit maintenance to troubleshoot the HIGH PRESSURE RELIEF VALVE. c. The   RUPTURE   DISC   ASSEMBLY   is   located   on   the   pipe   between   the   R.O.      PUMP   and   the   PULSE DAMPENER.  The rupture disc is a thin sheet of metal that tears when the pressure goes above 1425 psi.  Water is then discharged through the six holes in the top of the assembly.  Because the water is under such high pressure, it will make a lot of noise, and water will be sprayed on the inside of the ROWPU.  If the RUPTURE DISC ASSEMBLY ever activates, press the PUSH EMERGENCY STOP switch and open the REGULATE PRODUCT FLOW valve.  When the pressure has dropped, replace the RUPTURE DISC (see para.  3-7) and clean the R.O. elements (see para.  2-28).  Also 2-59







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