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NFPA
20 ( National Fire protection Association) is
standard which defines fire pump groups and
installations for fire protection. Pumps used in
Turbosan fire fighting sets complies with NFPA 20
but not listed.
Q/H
curve for fire fighting pumps must be flat as much
as possible. Thaks to this flatness when need for
higher capacity increases pressure drop will be
minimum and pressure require at sprinkler will be
stable for larger flow rates.
On
the performance curve Qmax value sould not be less
than 150 % of operating capacity. Closed valve
pressure Hmax value should not be less than % 140 of
operation point Hm value.
PUMPS
GROUP
NORM,
CEP and KAT series pumps and diesel engines and
electric motors used for building fire fighting
sets. They get combined in different installations
according to the operation conditions.
1)
Fire fighting sets with one pump or multiple pumps
with electric motor
2)
Fire fighting sets with one electric motor driven
and one diesel engine driven pump.
3)
Fire fighting sets with one electric motor driven
and one diesel engine driven pump and one jockey
Pump.
•
The main goal of the use of multiple pumps is to
have standby pump or in case of capacity increase it
is not needed to change the fire fighting set. Pumps
in fire figthing sets with 2 or 3 pumps must be
fully complying with each other.
•
The goal of Jockey pump use is to sustain pressure
value in the piping installation in case of pressure
leaks, without operating the main pumps. Vertical
multi stage pump used as jockey
pumps.
•
Capacity (Q) of the jockey pumps must be 1 % of main
pump’s capacity and discharge head of the jockey
pump must be 10 m more than that of main pump.
Example
: If discharge capacity head of the main pump is 170
m3/h and discharge
head
of the main pump is 60 m, discharge capacity of the
jockey pump must be 1,7
m3h
and discharge head of the jockey pump must be 60+10=
70 m.
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