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11. Technical Data
11.1 Hydraulic Data
Minimum Pre-Pressure:
The minimum pre-pressure "H" in metres head required to avoid
cavitation in the pumps is calculated as follows:
H = p
x 10.2 – NPSH – H
– H
b
f
p
= Barometric pressure in bar.
b
Barometric pressure can be set to 1 bar.
NPSH = Net Positive Suction Head in metres head
(to be read from the NPSH curve at the highest flow).
See Installation and Operating Instructions for
CR pumps.
H
= Friction loss in suction pipe in metres head.
f
H
= Vapour pressure in metres head, t
v
temperature.
See Installation and Operating Instructions for
CR pumps.
H
= Safety margin of minimum 0.5 metres head.
s
Note: During operation, pressure drops in the manifold will in-
crease the required minimum pre-pressure.
Maximum Pre-Pressure:
See Installation and Operating Instructions for CR pumps.
11.2 Operating Conditions
Liquid Temperature:
Maximum +70°C.
Ambient Tempera-
0 °C to +40°C.
ture:
Operating Pressure:
Maximum 16 bar.
11.3 Sound Pressure Level
For sound pressure level, see Installation and Operating Instruc-
tions for the CR pumps.
The sound pressure level for a number of pumps can be calcu-
lated as follows:
L
= L
+ (n – 1) x 3
max.
pump
L
= Maximum sound pressure level.
max.
L
= Sound pressure level for one pump.
pump
n
= Number of pumps.
30
– H
v
s
= liquid
m
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