GMW 5203, User Manual

Page: 62 / 71

AP-134
Thermo Scientific Cooling Water System:
Cleaning/Flushing Procedures
Analytical Procedure
SEMIANNUAL WATER CHANGE
Purpose
All cooling water systems require attention in
order to minimize corrosion and fouling,
especially biofouling. Since these systems
are small, the simplest method is to change
the treated cooling water on a regular
schedule. Flushing the system will remove
material that accumulated since the last
water change. The following procedure will
remove loose material, sanitize the cooling
circuit, passivate metal surfaces, and
improve system performance and reliability.
Procedure
1. Drain the system completely.
2. Refill the system with deionized (DI),
distilled or Reverse Osmosis (RO) water
and circulate for 10-15 minutes.
3. Drain the system completely.
4. Refill the system with DI water. Add the
contents of the bottle labeled
460-Thermo100. Circulate for 10-15
minutes.
5. Add the contents of the bottle labeled
NALCO 7330. Circulate for 3-4 hours.
6. Attach the Fluid Replacement Reminder
sticker to a prominent location on the unit.
Sign and date the sticker noting when the
system was treated and a scheduled date
for the next treatment.
7. The system is now ready for use.
FLUSHING AND STARTUP FOR
EXISTING SYSTEM
Purpose
Existing cooling water systems might
contain treatment chemicals that can be
incompatible with 460-Thermo100.
Additionally, existing systems might contain
corrosion by-products and bacteria.
These materials will increase system
corrosion and impede performance of 460-
Thermo100.
For best results, these materials must be
removed from the system before starting the
new treatment program. Additionally, metal
surfaces should be passivated before
starting any treatment program. Passivation
helps to minimize corrosion and prepares
the metal surface for the corrosion inhibitors
in the treatment program. The following
procedure will remove old treatment
chemicals and bacteria, sanitize the cooling
circuit, passivate metal surfaces, and
improve system performance and reliability.
Procedure
1. Drain the system completely.
2. Refill the system with deionized (DI)
water, and circulate for 10-15 minutes.
3. Add the contents of the bottle labeled
460-Thermo100. Circulate for 10-15
minutes.
4. Add the contents of the bottle labeled
NALCO 7330. Circulate for 3-4 hours.
5. Drain the system completely.
6. Refill the system with deionized (DI),
distilled or Reverse Osmosis (RO) water.
Add the contents of the bottle labeled 460-
Thermo100. Circulate for 10-15 minutes.
7. Add the contents of the bottle labeled
NALCO 7330. Circulate for 10-15 minutes.
8. Attach the Fluid Replacement Reminder
sticker to a prominent location on the unit.
Sign and date the sticker noting when the
system was treated and a scheduled date
for the next treatment.
9. The system is now ready for use.