2.2.2 Passive Purge Sprinkler System
A passive purge system is de
fi
ned in NFPA 13D as a type of sprinkler
system that serves a single toilet in addition to the sprinkler system.
Water Heater
To Domestic
To Domestic Hot Water
Cold Water
City Water Main
Water Meter
Single
Toilet
T/P Relief Valve
Domestic Cold Water
Domestic Hot Water
Fixtures
Service Line
Fire Protection
Fire Sprinkler
Fire Sprinkler
Fig. 2.3: Passive purge system
2.2.3 Stand-Alone Sprinkler System
A stand-alone system is de
fi
ned in NFPA 13D as a type of sprinkler
system where the above ground piping serves only
fi
re sprinklers.
Water Heater
To Domestic
To Domestic Hot Water
Cold Water
City Water Main
Water Meter
T/P Relief Valve
Domestic Cold Water
Domestic Hot Water
Service Line
Fire Protection
BFP
Pressure Relief Valve
(set 130 psi)
Drain & Test
Connection
Fire Sprinkler
Fire Sprinkler
Fig. 2.4: Stand-alone system
NOTICE
These drawings represent design intent and concept only. This
technical information is not intended to be used as
fi
nal drawings or
speci
fi
cations and is provided only as an aid in designers' develop-
ment of the
fi
nal speci
fi
cation and is not intended as a substitute for
sound judgment.
2.3 Piping Con
fi
gurations
The NFPA 13D standard de
fi
nes three types of piping systems that
are allowed to be used in residential occupancies stating that piping
con
fi
gurations shall be permitted to be gridded, looped or straight-
run, or to be combinations thereof.
Of the three aforementioned con
fi
gurations:
- Gridded systems provide the best hydraulic characteristics for
pressure/
fl
ow calculations.
- Looped systems provide hydraulic characteristics better than
straight-run systems, but not as good as gridded systems.
- Straight-run system provide the least hydraulic characteristics.
2.3.1 Gridded System
A gridded system is a sprinkler system connected by multiple branch
lines. An activated sprinkler will be provided with water from both
sides, while other branch lines help transfer the water.
City Water Main
Water Meter
Domestic Cold Water
Domestic Hot Water
Fixtures
Service Line
Fire Protection
To Domestic
Hot Water
Fig. 2.5: Gridded system layout
5
