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Using check valves to subdivide dry /preaction Pipe System

Using check valves to subdivide dry /preaction Pipe System

Using check valves to subdivide dry /preaction Pipe System

(OP)
I see the NFPA13 as below
7.2.3.9 Unless installed in a heated enclosure, check valves shall not be used to subdivide the dry pipe systems.
7.2.3.9.1 When check valves are used to subdivide dry pipe systems in accordance with 7.2.3.9, a hole 1⁄8 in. (3 mm) in diameter shall be drilled in the clapper of each check valve to permit equalization of air pressure among the various parts of the system.
It is said such application of check valves can be used to avoid trip test time if below 750 gallon capacity.
i dont see any part of the NFPA 13 says that, where is it specified in NFPA13?
Does that mean, that if i use the two check valves in a dry systme of 1500 gallons to split into two parts , so that only use one part of system volume to compare with 750 gallons threshold?
Please help out, thanks in advance!

RE: Using check valves to subdivide dry /preaction Pipe System

Quote (morgan.z)

i dont see any part of the NFPA 13 says that, where is it specified in NFPA13?

See 7.2.3 (ed. 2016).


Quote (morgan.z)

Does that mean, that if i use the two check valves in a dry systme of 1500 gallons to split into two parts , so that only use one part of system volume to compare with 750 gallons threshold?

If using an accelerator for each, yes.

RE: Using check valves to subdivide dry /preaction Pipe System

(OP)
Many Thanks to UFT12.
I can see that 7.2.3.9 says check valve can subdivide dry system,such sub system can apply to 7.2.3 in NFPA 13.

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