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We are having a discussion in our office; we are doing a 14,000 square foot addition. The existing riser has 2 systems that are approximately 40,000 square foot each. On the middle of one of the systems there is a dry system for the loading dock.
Does the dry system count as its own system or is it included in the 40,000 square feet for purposes of a total system area? Submitted anonymously and posted for discussion. Discuss This | Submit Your Question | Subscribe
5 Comments
Dale
7/6/2020 10:07:06 am
From what info you have provided, maybe some other details would change my mind.....but the dry system would be it's own system. Is it fed with a dedicated line from the Standpipe to a Dry Alarm Valve? Or is the valve located in a service room, with the Dry Main then feeding the space? My say is it's own system, and not part of the 40,000 sf area, with what you have provided.
Dominic
7/6/2020 10:32:22 am
It does not have its own dedicated main. You have half of the system then there is tee cut in to feed the dry valve and then it goes on to feed the rest of the system
Casey Milhorn
7/6/2020 10:09:14 am
If the control valve that shuts off the wet system, also controls the dry system, then that is one system all together. Meaning that if you have to shut down the wet system to repair a leak and it also takes the dry system out of service, that is not its own system. That is the intent of NFPA 13, but not sure of the exact phrasing on how that is written in there. Didn't look first.
On the Clock
7/6/2020 10:57:18 am
In your example, since a single riser valve would shut down both the main system and the auxiliary system, so it will exceed "the maximum floor area on any one floor to be protected by sprinklers supplied by any one sprinkler system riser or combined system riser" (8.2.1 in the 2016)
Rusty Scott
7/6/2020 03:57:34 pm
agree with both "on the clock " and "Casey Milhorn" Leave a Reply. |
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