Home Fire Sprinkler Systems and PEX Pipe

06/21/2016 0 Comment(s)

PEX pipe is approved for use in fire sprinkler systems, under the National Fire Protection Association (NFPA) 13D code and UL 1821. NFPA 13D covers sprinkler systems that operate with standard water pressure, without a connection for the fire department. The fire sprinkler system must also be part of a multipurpose system.

The use of PEX offers an affordable alternative to other plumbing systems and makes the installation process significantly easier. PEX pipe is not susceptible to freezing, resists corrosion and less fittings are required.

 
Multipurpose systems are those that combine regular household potable water supplies, both hot and cold, with the sprinkler system. This type of installation does not require the use of backflow preventers or check valves and no standard inspections or maintenance is required. A multipurpose system is less expensive to install because it relies on the same common water supply.
 
Basic PEX fire sprinkler installation steps

A cold water connection must be available to begin running the PEX pipe. This should be done with a manifold for ease of installation. Using a manifold with separate shut offs allows the fire sprinkler system to be turned on when all connections are complete and turn off if changes are needed. The sprinkler supply line should be installed ahead of any supplies to individual plumbing fixtures.
 
Fire systems require the use of ¾ inch PEX pipe. While the color for the tubing is not specific, white is normally used to distinguish the fire sprinkler line from hot and cold supplies. Plan the path for the sprinkler system in advance according to building requirements. Sprinklers are not required in bathrooms, closets or home garages. Remember that PEX pipe allows for the use of tee fittings or elbows for easy directional changes or splitting of sprinkler lines.
 
Sprinkler systems should be installed before drywall ceilings, but can be connected directly to the ceiling. Sprinkler heads are connected with a special PEX adapter and the use of crimp rings or cinch clamps. Choices in sprinkler heads are available that allow the sprinkler to be concealed behind a drop-down plate when the installation is completed above a finished ceiling.
 
Do note that you must check your local building regulations and code requirements before installing any fire sprinkler system. While many states will allow the use of PEX in stand-alone sprinkler systems, it is not approved under NFPA 13D. To meet building code requirements, fire sprinkler systems must normally be installed by a licensed plumber.

 

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