At our plant our fire protection system is a dry system and I’m assuming it would be at the parkade was well. Being dry means usually the pipes are full of pressurized air under normal conditions but if there is a leak in the system ( for example a sprinkler head breaks) the loss in air pressure causes a valve to trip allowing water into the system.
I’m just speculating but if the entire system was flooded and not drained right away then it would be a huge job to thaw and probably repair/replace the system. For us if any part of the sprinkler system is not operational then it’s a huge deal with insurance companies.
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