22
Where multiple riser systems exist, the antifreeze solution system can be
supplied to multiple risers from a single pump system and the pressure
switch for each system must be controlled through the pump system
control panel. When the pressure drops below set point, a solenoid valve
supplied from the CS-1 pump shall open to allow flow of antifreeze
solution into the system(s) that are low on pressure. When pressure is
established, the solenoid valve will shut off.
Where multiple systems are supplied from a single CS-1 pump and a
single system operates due to water flow from open sprinkler, the control
panel is signaled by the alarm or flow switch of operating riser and shuts
off the supply solenoid to that riser. The remaining systems maintain
supervisory pressure. This prevents contamination of antifreeze solution
with water during operation of a single system and eliminates air pockets
that may contaminate antifreeze solution or cause pipe corrosion.
5.1.9 Propylene Glycol and Water Solution Premix
Premix 35% or 50% propylene glycol and water solution that is certified
by the manufacturer or a third-party agency is to be installed in the
system piping.
Field mixing of propylene glycol and site water is
strictly prohibited, as the control of the mixture cannot be assured.
Firefighter Eliminator C 35% premix solution or Firefighter Eliminator F
50% premix solution (refer to data pages 49 a-b and 50 a-b) are required
by Viking, as they are mixed in the proper proportion and were utilized for
the research fire tests. Firefighter Eliminator C and Firefighter Eliminator
F include corrosion inhibitors and de-ionized water to prevent the
minerals in site water from reacting with the corrosion inhibitors.
This extends the usable life of the propylene glycol/water solution.
Improper field mixing of solution can result in reduced capability to
prevent freezing or to control a fire. The corrosion inhibitors included in
the premix provide corrosion control and microbiological control of the
system piping and components.
5.1.10 Riser System
The arrangement of the riser
system shall include a Viking
Model E-1 or F-1 Deluge
Valve with Conventional
Trim, Electric Release, a
primary Easy Riser
TM
check
valve with trim for preprimed
preaction system, an
isolation Easy Riser
TM
check
valve including cold storage
by-pass trim.
Summary of Contents for ESFR
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