sanitizing flush will leave the RO vessels full of sodium bisulfate sanitizing solution. This sanitizing solution will have to be
drained if the ROWPU is going to be used in freezing temperatures.
The polyelectrolyte and sequestrate systems do not need to be flushed. Operators drain these tanks before moving the
ROWPU or if the shutdown exceeds 24 hours. To complete the shutdown, operators need to open all drain valves except
those on the RO vessels.
Monitoring Shutdown to Long-Term Secured Status. Your operators are to do this shutdown procedure when the
ROWPU will be shut down for more than three days. They will need to have 1,000 gallons of potable water available.
Before completing operations, operators must have a 5-gallon can with product water to use in the polyelectrolyte tank during
the next start-up. The procedure for shutdown to long-term is the same as for temporary-secured with the addition of
removing the raw water section hose at the pump and opening the drain valve on the pump. Operators are then to disconnect
the raw water discharge and waste hoses. They must coil them and place them in a protected place. They then need to turn
off the air compressor and open the air manifold bleed valves. Next, they are to turn off the main circuit breaker and secure
the generator. Finally, they need to drain the distribution systems and pack the equipment for movement or storage. This
completes the shutdown of the ROWPU.
Supervising Alarm Shutdown. The alert horn will sound and the ROWPU will automatically shut down. If this should
happen, you will direct operators to push the alarm silence button and refer to the troubleshooting section in TM 10-4610-
232-12 (see Part E: Preventive Maintenance Requirements: Supervise Troubleshooting 3,000-GPH ROWPU) to locate and
remedy the cause for shutdown. Among some of the main reasons for automatic shutdown are:
If the feed water pressure to the high-pressure pump is low, the feed pressure low red light will go on.
If the high-pressure pump has excessive discharge pressure, the high-pressure pump high red light will go on.
If the product water pressure is excessive, the product pressure high red light will go on.
If the clean/flush tank level is too low, the clean/flush low-level light will go on.
Monitoring Emergency Stop. Your operators must be told about this procedure, and when to correctly use it and why. They
are to push the emergency stop button only when equipment failure or another problem demands immediate shutdown.
They are NOT to use the emergency stop button for routine shutdown. The previously discussed shutdowns are to be used for
the appropriate time duration. Pushing the emergency stop button immediately stops all motors within the ROWPU. To
restart, an operator needs to follow the procedure of pulling out the emergency stop button, push the system reset button, and
then push the initiate button.
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