
SECTION 4-5
OPERATION
FLOWMAX RO MANUAL REV: B 05/1999
USFilter
United States Filter Corporation
Long term shut down
should be used for when the system will be down for a prolonged
shutdown, as for major repairs, modifications or going out of service.
1.
Turn the H-O-A switch to OFF. Install a Lock Out device and a Lock Out Tag on the
switch.
2.
Close the manual feed water inlet valve (V-1), located off the RO unit.
3.
Once the feed water inlet pressure indicator reads zero, it is safe to service the unit.
The system is now isolated from the standpoint of electrical and hydraulic energy and can now be safely
serviced. To restart system, simply open the manual feed water valve and turn the HOA switch back to
AUTO.
4.4 LONG TERM SHUTDOWN PROCEDURE
If the system is to be down for a period longer than 7 days, it is recommended that a biocide be
pumped into the membrane elements to prevent biological growth. Prior to shutting down the
system, read and perform the procedure in Section 5.6, RO Membrane Element Long Term
Storage Procedure.
Failure to store the membranes in a biocide for long term shutdown can cause
irreversible damage to the membranes due to bacterial growth.
1.
Turn the RO unit H-O-A switch and the disconnect switch to the OFF position.
2.
Install a Lock-Out device and a lock Out Tag on the disconnect switch.
3.
If the RO membranes are to be left in the vessels, go to Section 5.6 Membrane Element
Long Term Storage Procedure and follow the instructions there.
4.
Fully close the manual feed water isolation valve and install a Lock-Out device and a
lock Out Tag on the valve.
5.
If applicable, you may also have to fully close any process valves located in the RO unit
product line down stream of the product divert to drain valve junction to prevent
unwanted RO product water from passing this point, and install Lock-Out / Tag-Out
equipment on the valve.
The RO UNIT is now isolated from a standpoint of electrical energy and hydraulic or
water pressure energy and may be safely stored for up to a year. If longer storage is
required, the membranes need to be removed and stored under more controlled
conditions. Contact U.S. Filter for more details.
CAUTION