3.
"Shutdown to temporary secured status" procedures are used when the
ROWPU is to be shutdown longer than three hours but no longer than three
days.
Use 525 gallons of potable water in this procedure.
Be sure
sufficient water is available. Perform after-operation PMCS as appropriate.
If the "shutdown to temporary secured status" procedures are to be used have
your crew perform the following:
a. Backwash the media filter with product water in the clean/flush
tank.
(1) Open the clean/flush tank drain valve.
When the tank is empty
close the drain valve. Remove the cartridge filter water utility hose from
the clean/flush tank inlet and connect the product utility hose to the
clean/flush tank inlet. Fill the clean/flush tank to just below 100 gallons
to prevent overflow when the chemical port is opened.
(2) Partially close
the product water shut-off valve to provide back
pressure.
If the product
shut-off valve is closed too far, the pressure
will increase over 35 psig
and the ROWPU will automatically shutdown. Open
the product utility hose
valve and fill to 100 gallons, then close the
valve.
(3) Open the chemical port cover and pour in one small packet of
bisulfite. Clean off any chemical that is in the port opening and close the
cover.
(4) Open the product utility hose valve. When the level reaches the
top of the level gage, close the utility hose valve and open the product
shut-off valve.
(5) Check the hypochlorite tank level.
If less than nine gallons,
add six gallons of product water from the product utility hose and one
packet of hypochlorite. Check to ensure that the air tank pressure is 900
psig or more. If less, wait until pressure builds to 900 psig.
(6) Backwash
the
media
filter.
Do
not
forward
flush
the
media
filter.
b. Have the crew perform a "system flush".
Flush with potable water as
follows:
(1) Make sure the main circuit breaker is on and the system mode
switch is in the ON position. Set the operation mode switch to system clean
and push initiate.
1-19
QM4911
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