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TMM-260
Preservation procedures for RO elements
TORAY REVERSE OSMOSIS ELEMENTS section page:
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Operation, Maintenance and Handling Manual rev.: 105
v
ersion: October 2012
Preservation procedures for RO elements
The objective is to store elements under clean conditions to maintain performance
and to prevent bacteria growth.
After system shut-down, displace brine in the system
with flushing water.
General conditions for preservation:
Flushing water: Use Pre-treated feed water (see Table 260-1),
or RO product water.
Water for the flushing should not contain any
oxidants
Flushing water pH range should be maintained
between 3-8.5.
Table 260-1: Flushing water of various RO feed water
treatment system
RO feed water type Flushing water
Sea water Pre-treated feed water
Brackish water Pre-treated feed water
Waste water RO product water
High pH Feed water
(such as 2nd pass
high pH feed water)
z
Pre-treated Pass 1
feed water without
NaOH
z
1st pass product
water without NaOH
If potential for scaling and fouling exists,
membranes must be flushed on shutdown
according to TMM-250 Flushing procedures.
1) To maintain performance, elements must be wet at all times.
2) To prevent bacterial growth in the pressure vessels, sanitization procedures
may be required - see TMM-400: Sanitization Methods
Page 59
Coral Sea Owner's Manual
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