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Maximum No. Of Systems from Ring Main Spur

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DTR

Mechanical
Joined
Oct 30, 2002
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21
Location
GB
Can anyone please advise me if there is a restriction on the number of Fixed Fire Protection Systems (Deluge Waterspray)that can be supplied from a spur off a Yard Ring Main.

I thought there was something in NFPA 850 but I can't find it, my concern is the number of systems that may be isolated simultaneously.
 
There is nothing that I am aware of that limits the number of systems being supplied by a single lead in. If I recall correctly, I believe that Factory Mutual recommends no more than 4 risers...but that could be old information.

We typically try to limit to 4 or 6 risers. Simply because the cost to run overhead bulk piping for any more systems will exceed the cost for an additional lead-in to the building from the underground loop.
 
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