CEA 4001 - Page 143

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G.3.3.2 Hydraulically most favourable location
The area of operation shall be as near as possible square. The following shall be considered:
a) in the case of terminal and looped configurations, the area shall where possible
Include sprinklers on one distribution pipe only. The number of sprinklers calculated to be
operating on ranges, or pairs of ranges in end-centre installations, shall be located on
each range or pair of ranges at the hydraulically most favourable Location. Sprinklers not
forming a full range or pair of ranges shall be located on the next range row at the
hydraulically closest locations (see figures H10 and H12);
b) in the case of gridded configurations, the area shall be located on ranges at the
hydraulically most favourable location. Sprinklers not forming a full range length shall be
located on the next range row at the hydraulically closest locations (see figure H11).
G.3.4 Minimum sprinkler discharge pressure
The pressure at the hydraulically most unfavourably situated sprinkler when all the sprinklers in the area
of operation are open, shall be not less than that required by G.3.1 or the following in table G15,
whichever is the higher.
T
Table 51: Minimum sprinkler discharge pressure and minimum sprinkler K factor (G15)
Hazard class
K factor minimum
Minimum pressure
Bar
LH
57
0,7
OH
80
0,35
HHP/HHS roof or ceiling protection
80
0,5
HHP/HHS roof or ceiling protection
115
0,5
HHP/HHS roof or ceiling protection
160
0,5
In-racks sprinkler
80
2
In-racks sprinkler
115
1
G.3.5 Minimum pipe diameters
The minimum allowable pipe diameter is 20mm for LH and 25mm for OH, HHP and HHS.
Pipe diameters on the installation side of the control valve set may decrease only in the direction of
water flow, except in the case of grid and loop configurations.
For installations with range pipes fed from one end, (see figures H9 and H12) no 25mm diameter range
pipe shall be fitted with more than 8 sprinklers.
For installations with ranges pipes fed from both ends, (see figure H11) no 25mm diameter range pipe
shall be fitted with more than 16 sprinklers.
Upright sprinklers may not be directly connected to any pipe with a diameter greater than 65mm.
Pendent sprinklers may not be directly connected to any pipe with a diameter greater than