In a multiple preaction system with several risers or preaction valves, can I use just one compressor to fill and maintain the pressure in all the systems? and If it possible to do that, how should I select the compressor?
Thanks in advance.
you might check, this should apply to preaction
NFPA 13 doesn’t distinguish between types of compressors, but it does require the compressed air supply to come from a source that’s always available (188.8.131.52.1) and can restore normal air pressure to the sprinkler system within 30 minutes (184.108.40.206.2). The sole exception: compressors that help protect refrigerated spaces maintained below 5°F (–15°C), where normal system air pressure can be restored within 60 minutes (220.127.116.11.3).
Sorry not near the book to check on pre action
It might be a good idea to install a compressor listed for fire protection use. If I show up for an annual inspection and see a compressor installed from Harbor Freight I would be concerned.
It looks like the 30 minute refill rules does not apply, to a pre action, since the air is there just to monitor the pipe.
Either pre action or dry pipe , can use "shop air" compressor, so does not have to be listed.
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