Residential fire sprinkler systems are typically installed as either a multipurpose or a standalone system.Multipurpose systems are integrated with the home’s cold-water plumbing and are often installed by specially trained plumbing contractors. As defined in NFPA 13D, Standard for Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes, multipurpose systems are intended to serve both fire sprinkler and domestic needs.

 

They are usually installed as a looped, or flow-through, system where the sprinkler pipe feeds most sprinklers from two paths. This is a common design approach when using crosslinked polyethylene (PEX) pipe for multipurpose systems. In essence, all sprinklers are located within a PEX loop with water being supplied from two directions. Cold-water plumbing fixtures are then fed from this fire sprinkler loop. Each time a plumbing fixture is used, fresh water circulates through the fire sprinkler system. The system is essentially tested every day, providing peace of mind to occupants that their sprinkler system is ready to protect them in case of a fire.

 

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