PRESSURE
SWITCH
CONTROL PANEL
BALL VALVE FOR DRAIN
2
1
1/2" CV WITH 2.4 MM HOLE INCLAPPER AND WILL BE CONNECTED IN OPPOSITE DIRECTION
BV
CV
TO DRAIN
1
BV
1
2
TO DRAIN
CHECK VALVE
DISCHARGE
VALVE
DISCHARGE
INCREASER
BOWL
PIPE
Fig. No.
22
17
of
46
Subject to change without prior notice
INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS
FIRE PUMPS - NF-VTP SERIES
Ref. No. NFVTP-IOM/
2016
/V.
02
»
Where the water is clean (i.e. water that is free from obstructing material), ground-face unions with non-corrosive
diaphragms drilled a nominal dia. of
0.09375
in. (
2.4
mm) orifice shall be permitted in place of the check valves.
In most cases, potable water is considered to be acceptable for this application.
»
Where the above requirements are not met, there shall be two check valves installed in the pressure sensing line
at-least
5
ft. (
1
.
52
m) apart with the nominal dia. of
0
.
09375
in.(
2
.
4
mm) dia. hole drilled in the clapper to serve
as dampening.
»
There shall be a no shut-off valve in the pressure sensing line.
»
Pressure switch actuation at the low adjustment setting shall initiate the pump starting sequence (If the pump is
not already in operation).
Refer Fig. No.
22
for details.
5.13. ENGINE Cooling Line
Most fire water pump diesel engine installations use water cooling systems. These fall into two categories - radiator
and heat exchanger.
