Viking ESFR, Руководство пользователя

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piping due to expansion of the propylene glycol when the temperature
rises in the storage area.
In order to prevent the pressure relief valve (PRV) on the Easy Riser
TM
valve trim from operating, the pressure control system is set to maintain
pressure below the set point of the PRV and above the system
maintenance pressure. The alarm pressure switch will prevent the APCS
from operating when the deluge valve has operated.
Prior to installation of system, maximum temperature changes are
required to be considered to determine possible expansion and
contraction rate of propylene glycol solution. If the contraction rate is
greater than the storage tank that accompanies excess pressure pump,
an additional supply tank to supplement excess pressure pump shall be
installed.
5.1.5 Solution Test Valves
Multiple propylene glycol/water solution test valves are to be installed on
the system piping for semi-annual testing with a refractometer. The
testing stated in this section is more restrictive than the required test
frequency indicated in NFPA 25. Solution test valves should be located in
several areas of the system piping:
•
The most practical location immediately downstream of the primary
Easy Riser
TM
check valve.
•
The most remote location from the Easy Riser
TM
check valve.
•
One valve located at the end of 50% of the line piping directly on the
Model AV-1 Air/Vent Valve assembly.
•
A test valve shall be located at the end of the nearest line on the tree
system and the last line on the tree system.
If the propylene glycol/water solution becomes diluted or does not pass
the refractometer test, the entire system is to be drained. All sections of
trapped piping are to be drained. Five percent (5%) of the pendent ESFR
sprinklers are to be removed and inspected for frozen solution.
If any of the pendent ESFR sprinklers are found with frozen solution, then
all the pendent ESFR sprinklers are to be removed and replaced with new
Viking K25.2 Pendent ESFR VK510 Sprinklers prior to re-charging the
system with new 35% or 50% premix propylene glycol/water solution. If
the 5% of removed sprinklers are not damaged, they can be re-installed
in the system. (Refer to the system service schedule for additional
solution tests.)
Sampling shall be taken from multiple points within the freezer system.
Ensure that the CS-1 pump antifreeze supply control system is returned
to the fully pressurized state once fluid sampling is completed. Antifreeze
solution shall be checked semi-annually with a refractometer to detect the
concentration of antifreeze solution and effectiveness against freezing.