21
The purpose the antifreeze pressure pump is to lock in a supervisory
pressure in the system and eliminate air for proper performance of the
system. The CS-1 pump utilized on the ESFR Cold Storage System
provides a static pressure on the propylene glycol/water solution in the
system by taking suction from an atmospheric storage tank with premix
propylene glycol and water solution and discharging to the downstream or
system side of the primary Easy Riser
TM
check valve clapper.
Antifreeze solution pressure shall be maintained at a minimum of 50 PSI
(345 kPa). This maintenance pressure is applied by the antifreeze pump
system in order to eliminate air pockets and prevent water from migrating
into the system antifreeze in the event of an accidental operation of the
deluge valve. This is why it is important to eliminate all air from the
system. If air is present, it can compress to allow water into the system,
reducing the desired percentage (concentration) of propylene glycol in the
solution, thus increasing the risk of localized freezing. Also by eliminating
air pockets, the extended life of the antifreeze solution and possible
corrosion of system piping is minimized.
A supervisory pressure switch shall be located on the
system side of the primary Easy Riser
TM
check valve or
directly adjacent to the system inlet that monitors the
antifreeze solution pressure and signals the CS-1 pump
to maintain pressure in the proper range. The CS-1
pump provides a 5 GPM (18,9 l/min) flow at a minimum
of 50 PSI (345 kPa) pressure. The supervisory pressure
switch is included in the Easy Riser Check Valve Cold Storage Trim for
Preprimed Preaction Systems.
Where a single system is present, a reserve tank with a minimum size of
65 gallons (246 liters) constructed of cross-linked polyethylene shall be
utilized for the storage of propylene glycol/water solution to supply the
CS-1 pump. The tank is equipped with a fluid level indicator, and an
internal low fluid level indicator that shuts off the pump and gives a
supervisory alarm of low fluid level. The tank is fitted with a
pressure/vacuum vent valve.
If a single system is installed in a storage area that is subject to varying
temperature changes, the system design shall determine the maximum
expansion and contraction rate of the propylene glycol solution to
establish if an additional supply tank is required to be added to the
reserve tank and excess pressure pump. This applies when using the
automatic pressure control system that is piped from the riser back into
the CS-1 tank.
Where multiple systems are supplied from a single CS-1 pump, a reserve
tank with a minimum size of 160 gallons (606 liters) constructed of cross-
linked polyethylene shall be utilized for the storage of premix propylene
glycol/water solution to supply the CS-1 pump.
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