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T
OTAL
P
AC
®
3
B
Integrated Fire Protection System
Mechanical Section - Non Interlock Preaction System - Pneumatic Release
FM-076A-0-41C
1.3 Placing the system in service
1. Verify that the main water supply valve
(D1)
is
CLOSED
.
Verify that the system has been properly drained.
2. Verify that all automatic sprinklers are set and that
inspector's test valves and/or piping auxiliary drain
valves are
CLOSED
.
3.
CLOSE
main drain valve
(D3)
. Verify that the manual
emergency release valve
(B10)
is
CLOSED
.
4. Air supply must be
OPEN
(see section
D
AIR
SUPPLY
).
5. Establish recommended supervisory pressure to the
system piping network (see paragraph 2.1
NORMAL
CONDITION
of the current section and section
D
AIR
SUPPLY
).
Note:
On system provided with air pressure maintenance
device (air supply style "B"), verify that the APMD bypass
valve
(E8)
is
CLOSED
and that APMD input and output
valves
(E6 and E7)
are
OPEN
.
6. Establish recommended supervisory pressure to the
pneumatic release piping network (pilot line) (see
paragraph 2.1
NORMAL CONDITION
of the current section
and section
D
AIR
SUPPLY
).
7.
OPEN
priming valve
(B1)
. Verify that the pressure
indicated at the priming pressure gauge
(B11)
is equal
to, or greater than the pressure indicated at the water
supply pressure gauge
(B12)
.
8.
OPEN
flow test valve
(B6)
.
PARTIALLY OPEN
main water
supply valve
(D1)
.
9. When full flow develops from the flow test valve
(B6)
,
CLOSE
the flow test valve. Verify there is no flow from
drip check valve
(B7)
when the plunger is pushed.
10.
FULLY OPEN
the main water supply valve
(D1)
.
11. Verify that the alarm test valve
(B5)
is
CLOSED
and that
all other valves are in their "normal" operating position
(see paragraph 2.1
NORMAL CONDITION
of the current
section).
12. Check and repair all leaks.
13. On new installation, system that has been placed out of
service, or where new equipment has been installed,
trip test the system to verify that all equipment functions
properly (see paragraph 1.7.3
FULL FLOW TRIP TEST
of
the current section).
14. Notify the
AUTHORITY HAVING JURISDICTION
, remote
station alarm monitors, and those in the affected area
that the system is in service.
Note:
When a valve has been removed from service and is
subject to freezing or will be out of service for an extended
period of time, all water must be removed from the priming
chamber, trim piping, water supply piping and any other
trapped areas.
1.4 System Operation
1.4.1 In the SET condition
System water supply pressure enters the priming chamber
of the deluge valve
(A1)
through the priming line which
includes a normally open priming valve
(B1)
, strainer
(B2)
,
restricted orifice
(B3)
and spring loaded check valve
(B4)
.
Water supply pressure is trapped in the priming chamber
of the deluge valve
(A1)
by spring loaded check valve
(B4)
,
pneumatic actuator
(F3)
, PORV
(B9)
(pressure operated
relief valve) and manual emergency release valve (
B10
).
The pressure in the priming chamber holds the deluge
valve clapper closed, keeping the outlet chamber and
system piping dry.
1.4.2 In a fire condition
When a releasing device operates from the pneumatic
release piping network (pilot line), or when an automatic
sprinkler fuses on the system piping network, the low air
supervisory
switch
(E4)
activates
and
pneumatic
actuator
(F3)
opens.
Pressure from the priming chamber of the deluge
valve
(A1)
is released to the open drain manifold faster
than it is supplied through the restricted orifice
(B3)
. The
deluge valve clapper opens to allow water to flow into the
piping network and alarm devices, causing water flow
alarms connected to the alarm pressure switch
(C1)
and
the optional water motor alarm
(C2)
to activate. When an
automatic sprinkler fuses, water will flow from the system
piping network.
When the deluge valve
(A1)
opens, the sensing end of the
PORV
(B9)
is pressurized, causing it to open. It then
continually vent the priming chamber, preventing the
closure of the deluge valve. The deluge valve can only be
reset after the system is taken out of service.
Note:
If the pressure from the pneumatic release piping
network (pilot line) is lost due to mechanical damage or
malfunction of a release device, the deluge valve
(A1)
will
open but the water will be trapped in the system piping
network. Alarm devices
(C1
and optional
C2)
will operate.
1.4.3 Manual operation
Anytime the handle of the manual emergency release
valve
(B10)
is triggered, pressure is released from the
priming chamber of the deluge valve
(A1)
causing deluge
valve to open. Water will flow into the system piping
network and alarm devices
(C1
and optional
C2)
will
operate. The PORV
(B9)
keeps the deluge valve open.
When an automatic sprinkler fuses, water will flow from the
system piping network.
1.4.4 Supervisory condition
If an automatic sprinkler opens prior the operation of a
pneumatic release device
or any time the supervisory
pressure is lost in the system piping network, the low air
pressure switch
(E4)
will signal a low air pressure
condition. Pressure is then released from the priming
chamber of the deluge valve
(A1)
causing deluge valve to
open. Alarm devices
(C1
and optional
C2)
will operate
.
Water will flow through the system piping network.
