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Important Definition for Sprinkler, firefighting

Er. Parbhakar Dwivedi


For the purpose of this part of regulations, the following definitions shall apply.

Assumed maximum area of operation, hydraulically most favourable location. The location in a sprinkler array of an AMAO of specified shape at which the water flow is the maximum for a specific pressure.

Assumed maximum area of operation, hydraulically most unfavourable location. The location in a sprinkler array of an AMAO of specified shape at which the water supply pressure is the minimum needed to give the specified design density.

Cut-off sprinkler. A sprinkler protecting a door or window between two areas only one of which is protected by the sprinkler.

Design density. The minimum density of discharge in mm/min of water, for which a sprinkler installation is designed, determined from the discharge of a specified group of sprinklers, in litre/min, divided by the area covered, in M2.

Distribution pipe. A pipe feeding either a range pipe directly or a single sprinkler on a non-terminal range pipe more than 300 mm long.

Distribution pipe spur. A distribution pipe from a main distribution pipe to a terminal branched pipe array.

Drop. A vertical pipe feeding a distribution or rang pipe.

End-side array. A pipe array with range pipes on one side only of a distribution pipe.

End-centre array. A pipe with range pipes on both sides of a distribution pipe.

Fire resistance. The ability of a component or the construction of a building to satisfy for a stated period of time the appropriate criteria specified in the relevant part of BS 476.

Fully hydraulically calculated. A term applied to pipe work in an installation in which all the pipe work downstream of the main installation control valve set is sized as per hydraulic calculations

Sprinkler installation. Part of a sprinkler system comprising a set of installation main control valves, the associated downstream pipes and sprinklers.

Jockey pump. A small pump used to replenish minor water loss to avoid starting an automatic suction or booster pump unnecessarily.

Main distribution pipe. A pipe feeding a distribution pipe.

Node. A point in pipe work at which pressure and flow(s) are calculated; each node is a datum point for the purpose of hydraulic calculations in the installation.

Range pipe. A pipe feeding sprinkler directly or via arm pipes of restricted length.

Riser. A vertical pipe feeding a distribution or range pipe above.

Rosette sprinkler rosette. A plate covering the gap between shanks or the body of a sprinkler projecting through a suspended ceiling, and the ceiling.

Sprinkler, ceiling or flush pattern. A pendent sprinkler for fitting partly above but with the temperature sensitive element below, the lower plane of the ceiling.

Sprinkler concealed. A recessed sprinkler with a cover plate that disengages when the heat is applied Sprinkler conventional pattern. A sprinkler that gives a spherical pattern of water discharge.

Sprinkler glass bulb. A sprinkler which opens when a liquid filled glass bulb bursts.

Sprinkler horizontal. A sprinkler in which the nozzle directs the water horizontally.

Sprinkler intermediate. A sprinkler installed below and additional to the roof or ceiling sprinklers.

Sprinkler pendent. A sprinkler in which the nozzle directs water downwards.

Sprinkler, roof or ceiling. A sprinkler protecting the roof or ceiling.

Sprinkler side-wall pattern. A sprinkler that gives a downward parabolic pattern discharge.

Sprinkler upright. A sprinkler in which the nozzle directs the water upwards.

Standard sprinkler layout. A rectilinear layout with the sprinkler aligned perpendicular to the run of the ranges.

Suction pump. An automatic pump supplying water to a sprinkler system from a suction tank.

Supply pipe. A pipe connecting a water supply to a trunk main or the installation main control valve set(s); or a pipe supplying water to a private reservoir, suction tank or gravity tank.

Suspended open cell ceiling. A ceiling of regular open cell construction through which water from sprinkler can be discharged freely.


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