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valves are to be installed in several areas on the system piping for testing with a
refractometer (refer to data page 45 a-j for testing requirements and procedures).
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 in all
locations throughout the system are to be removed and inspected for frozen
solution. If any of the pendent ESFR sprinklers are found with frozen solution, all
the pendent ESFR sprinklers are to be removed and replaced with new Viking
K25.2 Pendent ESFR VK510 Sprinklers prior to re-charging 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.
17.0 SYSTEM PRESSURE SETTINGS
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