CEA 4001 - Annex D; D D.1 Scope; Requirements for Zoned Installations; Zoning of Installations

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Annex D
Requirements for Multi-Storey Buildings
D.1 Scope
This Annex specifies requirements particular to the sprinkler protection of multi-storey buildings
when zoning is adopted. It applies only to OH sprinkler installations of the wet pipe type.
NOTE: see also Annex E for high rise systems.
D.2 Zoning of installations
Wet pipe Ordinary Hazard sprinkler installations may be zoned or unzoned.
The number of sprinklers to be controlled by any one wet control valve set in Ordinary Hazard may exceed
1000 (see Table 19), with the following restrictions:
a) the installation shall be zoned in accordance with D.3;
b) zoned installations shall not include any hazard greater than OH3;
c) car parks and areas involving the unloading and storage of goods shall be on a separate
unzoned installation;
d) the building shall be sprinkler protected through- out on all floors;
e) the total number of sprinklers controlled by any one control valve set shall not exceed 10 000.
D.3 Requirements for zoned installations
D.3.1 Extent of zones
No zone shall:
a) include more than 500 sprinklers;
b) encompass more than one ownership;
c) cover more than one floor level, which may however include a mezzanine floor no greate
than
100 m².
D.3.2 Zone subsidiary stop valves
Each zone shall be independently controlled by a single zone subsidiary stop valve, installed in a
readily accessible position at the floor level of the zone it controls. Each valve shall be secured open and be
labelled to identify the area of protection it controls.
D.3.3 Flushing Valves
Each zone shall be fitted with a valve not less than 20mm nominal diameter, either on the end
of the distribution pipe hydraulically most remote from the water supply, or on the end of each