MARCH, 2022
HD 235
PAGE 4 OF 16
HD FIRE PROTECT
PVT. LTD.
INSPECTION AND MAINTENANCE
Installed system piping network must be flushed
properly before placing the Deluge valve in service.
A qualified and trained person must commission
the system. After few initial successful tests,
an authorized person must be trained to perform
inspection and testing of the system. It is
recommended to have regular inspection and test run
of the system as per NFPA guideline or in accordance
to the organisation having local jurisdiction.
(i) WARNING
Inspection and testing is to be carried out only by
authorised and trained personnel. DO NOT TURN
OFF the water supply or close any valve to make
repair(s), or test the valve without placing a
roving fire patrol in the area covered by the
system. Also inform the local security personnel
and central alarm station, so that there is no
false alarm signal.
It is recommended to carry out physical inspection
of the system at least twice in a week. The
inspection should verify that all the control valves
are in proper position as per the system
requirement and that there are no damages to
any component.
The frequency of inspections must be increased
in the presence of contaminated water supplies,
corrosive/scaling water supplies, and corrosive
atmospheres.
(ii) NORMAL CONDITION
(a) All main valves are open and are sealed with
tamper proof seal
(b) Drain valves must be kept closed
(c) No leak or drip is detected from the drip valve
(d) All the gauges except the system side water
pressure gauge, should show the required
pressure
(e) There should be no leakage in the system
(iii) NORMAL CONDITION TEST
(a) The system should be checked for normal
condition at least once in a week
(b) Test the sprinkler alarm bell or electric alarm
by turning the alarm test valve to the test
position. The alarm should sound. This test should
be carried out at least once in a week
(c) Depress the drip valve knob. Significant
accumulation indicates a possible seat leakage
(d) Conduct the water flow test as per the system
testing procedure at least once a month
(iv) PERIODIC CHECK
Conduct the water flow test by actuating few of
the release devices provided in the system. Clean
all strainer(s) and line restriction nipple. This
test is to be carried out at least once in three
months.
ABNORMAL CONDITION
(i) ALARM FAILS TO SOUND
(a) Check for any obstruction in the alarm test
line, make certain that the sprinkler alarm is free
to operate
(b) If an electric alarm is provided, check the
electrical circuitry to the alarm
(ii) FALSE TRIPS
(a) Check for clogging in priming line, restriction
orifice check valve, priming valve & strainer
(b) Leakage in the release system
(c) The deluge air line restriction orifice clogged or
low supply pressure
(iii) LEAKAGE THROUGH THE DELUGE VALVE
(a) Damaged deluge valve seat or obstruction on
the seat face by foreign object
(b) Leakage in release system
(c) Partly clogged priming line restriction orifice
check valve
(d) Low air pressure on release system line or
leakage in release system
NOTE
:
(1) UL Listing is valid only when Deluge Valve is
installed with trim set as per trim drawing.
(2) The trip time of deluge valve on-off device through
detection network, will depend on volume of
detection network. If the trip time of deluge valve
is more, then it can be substantially reduced by
installing check valve in branch of release line in
the detection network. The check valve flow shall
be towards releasing device.
(3) The pneumatic system must have restricted
orifice at air or gas supply point. The restriction
nozzle are supplied with HD dry pilot actuation
trim.
(4) UL Listing is valid only when Listed Solenoid Valve
provided for electric operation of the deluge valve
is retained in the trim. If any other solenoid valve
is used, the deluge valve trip time may be quite
high or deluge valve may not trip.
(5) The Pressure Gauges standard supply is 300 psi
for water gauge for system pressure upto 175
psi. If system pressure is more than 175 psi,
then order for 600 psi water pressure gauges.
