We have a project where we're not sure about how to address protection of movable storage racks.
The cold storage facility requires a double-interlock pre-action system where the temperature can reach down to -4 deg F (-20 deg C). The storage consists of movable racks, 39 feet (12 m) tall, with a roof height of 46 feet (14 m).
Our biggest concern would avoiding in-rack sprinklers, since the racks are intended to be moveable.
Our understanding is that NFPA 13 considers movable racks as multiple row racks but there's not clear guidance there. We looked into ESFR as an option, but believe ESFR are not listed to be used with a pre-action system.
Is there a recommended solution/design path for ceiling-only protection on a double-interlock pre-action system?
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