CEA 4001 - Flow from Sprinklers; Sprinkler Temperature Ratings

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12.3 Flow from sprinklers
The water flow from a sprinkler shall be calculated from the following formula:
Q = K √ P
where:
Q is the flow in litres per minute;
K is the constant given in Table 25;
P
is the pressure in bar.
12.4 Sprinkler temperature ratings
Sprinklers shall be chosen with a temperature rating close to but no lower than 30°C above the
highest anticipated ambient temperature. Under normal conditions in temperate climates a rating of
68°C or 74°C is suitable.
Table 25: Sprinkler types and K factors for various hazard classes
Hazard class
Design density (mm/min)
Sprinkler type
Nominal K factor
LH
2,25
Conventional, spray ,
ceiling, fluch, flat,
spray
recessed, concealed
and
sidewall
57
OH
5,0
Conventional, spray,
ceiling, fluch, flat spray
,
recessed, concealed,
and sidewall
80
HHP and HHS
Ceiling
or roof sprinklers
10mm/min
Conventional, spray
80 or 115
> 10mm/min
< 12,5 mm/min
Conventional, spray
115
> 12,5 mm/min
Conventional, spray
115 or 160*
HHS intermediate
sprinklers
in
high piled storage
Conventional, spray, and
flat spray
80 or 115
NOTE: * only for fully calculated systems and in accordance with the manufacturers data sheet.
In unventilated concealed spaces, under skylights or glass roofs etc., it may be necessary to install
sprinklers with a higher operating temperature, up to 93°C or 100°C. Special consideration shall be