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antifreeze inlet ball valve. The deluge valve must be operated (opened) to
perform the flow test. Close the prime line valve and open the emergency
manual release valve. Make sure the diversion drain valve is open to flow
water to a drain area or the recovery tank as desired. Note: if antifreeze is
stored in the recovery tank, do not allow water to enter, or contamination
of solution will occur. Record the water supply pressure on the water
supply pressure gauge upstream of the deluge valve.
Open the main drain on the downstream Isolation check valve fully. This
will allow water to flow through the deluge valve and both the primary and
isolation check valves. Once the pressure gauge has settled to flowing
pressure, record the pressure on the water supply pressure gauge
upstream of the deluge valve.
After the water flow test is completed, close the water supply control valve
upstream of the deluge valve, drain all the water located between the
primary and isolation check valves. Then drain all water from between the
deluge valve and the primary check valve using the auxiliary drain on the
deluge valve trim. Close the main drain and auxiliary drain once water is
completely drained. Open the antifreeze supply isolation valve. The CS-1
pump will supply propylene glycol/water solution from the maintenance
solution supply tank. The CS-1 pump will stop running when the pressure
in the section of piping is 50 PSI (344 kPa) minimum or the set pressure
of the system pressure switch. Ensure there is no trapped air in the piping
between check valves by bleeding through the main drain valve of the
Isolation check valve. After system pressure is built, the CS-1 pump will
stop running. Open the down stream system isolation valve, when system
antifreeze pressure is at desired pressure and the CS-1 pump stops. Now
prime the deluge valve by opening the prime supply valve and watch for
pressure to build in the prime chamber of the deluge valve. Now, open
the system shut-off valve up stream of the deluge valve. Any supervisory
alarm switches silenced for system maintenance must be re-set. The
system is now in service.
5.2 Service Procedures
Drain-down of the individual system shall be done in the following manner.
If system operation has occurred:
1. After system trip or sprinkler(s) have operated and water has entered the
system, the complete system must be drained down immediately and
solution within the piping system disposed of.
2. All sprinklers are pendent type and must be removed and replaced with new
sprinklers. This is due to possible collection of water at each sprinkler and
creation of a small ice plug in each sprinkler.
3. If using the Viking Model AV-1 Air/vent Valve assembly the device also
breaks a vacuum in the piping system and provides faster and more
complete drainage of the system piping.
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