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Freeze prevention of water pipe
Follow the list if draining water inside the pump and
water pipe is difficult.
Using brine
Use ethylene glycol, propylene glycol, etc. for brine.
Ethylene glycol is inexpensive, and used for general
industry, and propylene glycol is used for food
industry since it is nontoxic.
All the circulating water (brine) and additives
(corrosion inhibitor, bacteria inhibitor, foam
inhibitors) must be used after consulting with the
business ordering party or supervisor for its impact
on environment, toxicity, corrosiveness, harmfulness
to human and management plan.
Contractor must take extra care regarding on
handling, packaging and transporting regulations and
procedure of the brine.
Do not use the brine that is harmful to humans or
equipment. In addition, brine must be injected to the
pipe according to specification and concentration
level that is actually required by system. (Do not
directly inject undiluted solution, consult business
ordering party or supervisor when undiluted solution
was brought to the site)
Before injecting the brine, evacuate any air that may
remain in the system and apply pressure to check for
leakage.
User must monitor and manage periodically to
maintain initially designed concentration level of
brine. If the concentration level decrease due to
leakage or over certain period of time, it may cause
due to pipe to freeze and burst.
Selecting brine
When using brine, refer to the following list and select
which do not damage the product.
Effective freezing prevent
Not corroding metal
Not permeating into material
Not generating scale
Not damaging mechanical seal of the pump
No risk of fire
Long duration of freezing prevent effect
Effective heat exchange performance
Less toxic
Usage and precaution of brine
Drain water inside the water system and wash it
thoroughly.
Put clean water in undiluted brine, and then put
brine to rated concentration. If concentration is too
high, performance of pump may decrease due to
viscosity and proportion. The concentration of brine
is measured and maintained by a densitometer.
Be careful of leakage, and add more brine if leakage
occurred.
Brine should be maintained or exchanged periodically
(before winter time every year) considering corrosion
resistance decrease and water contamination.
Do not use ethylene glycol for supplying or food.
Check the concentration before the winter time to
prevent freezing.
Type and specification of brine
For low temperature CHILLER, use glycol type brine
such as ethylene glycol and propylene glycol. If using
other types of brine (chloride type or alcohol type),
consult with brine manufacturer and check if it is
usable. Maintain the concentration periodically by using
densitometer to prevent freezing.
Glycol type brine
Glycol type brine has less corrosiveness like alcohol
type, and also it is less explosive, flammable, and
toxic.
Chloride type brine
Chloride type brine such as calcium chloride and
magnesium chloride is corrosive to metal. If using
chloride type brine, countermeasure for corrosion
is necessary. Take appropriate countermeasure
such as adding anti-corrosive, maintaining pH and
concentration, and closing brine system.
Alcohol type brine
Alcohol type brine is less corrosive to metal but
volatile, and the vapor is explosive and flammable.
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