CEA 4001 - Page 21

21
detector sprinkler causes loss of air or inert gas pressure to open the valve.
d
distribution pipe
A pipe feeding either a range pipe directly or a single sprinkler on a non-terminal range pipe more than
300mm long.
distribution pipe spur
A distribution pipe from a main distribution pipe, to a terminal branched pipe array.
drop
A vertical distribution pipe feeding a distribution or range pipe below.
end-centre array
A pipe array with range pipes on both sides of a distribution pipe.
end-side array
A pipe array with range pipes on one side only of a distribution pipe.
escutcheon plate
A plate covering the gap between the shank or body of a sprinkler projecting through a suspended ceiling,
and
the ceiling.
exhauster
A device to exhaust the air or inert gas from a dry or alternate installation to atmosphere on sprinkler
operation
to give more rapid operation of the alarm valve.
fire resisting compartment
An enclosed volume capable of maintaining its fire integrity for a minimum specified time.
fully calculated
A term applied to an installation in which all the pipework is sized by hydraulic calculation by the approved
sprinkler
contractor.
gridded configuration
A pipe array in which water flows to each sprinkler by more than one route.
hanger
An assembly for suspending pipework from elements of building structure.
high rise system
A sprinkler system in which the highest sprinkler is more than 45m above the lowest sprinkler or above the
sprinkler
pumps, whichever is the lower.
installation (sprinkler installation)
Part of a sprinkler system comprising a control valve set, the associated downstream pipes and sprinklers.
installation, alternate
An installation in which the pipework is selectively charged with either water or air/inert gas according to
ambient
temperature conditions.
installation, dry (pipe)
An installation in which the pipework is charged with air or inert gas under pressure.