Alarms Flashcards
Sprinklers systems that have more then ____ sprinklers must be supervised
20
What is the minimum flow to generate an alarm
Flow equal to the smallest orifice in the system (1 sprinkler)
After sprinkler flow, alarm must activate within
5 minutes
Local alarm is for
Sprinkler system has operated
WMG pipe size
3/4 non corrosive pipe
Max height for WMG
20 feet
WMG Max horizontal distance
75 feet
Paddle type water flow devices should be ____ from a control valve and drain
24”
Paddle type water flow devices should be ____ from a change in direction
6”
Paddle flow switches are to be set too
Lowest possible time to avoid false alarms
Alarm test bypass is fed from
Below the clapper
Excess pressure pumps are
Positive displacement pumps
What kind of postive displacement pump are excess pressure pumps
External rotary gear pump
Max differential for excess pressure pump
75psi
What size is the relief valve and what is it set too on excess pressure pump
1/4” & 130psi
3 conditions on panel are
-Alarm
-Supervisory
-Trouble
Annunciators are installed at
Every entrance available to the fire department
Resistors are measured in
Ohms
Max amount of of sprinkler systems to be attached to one WMG
3
What is the limit of sprinkler systems to be attached to electronic gong
No limit
Paddle slow switch is set to approx. ____ from the factory
15 seconds
Minimum flow to activate paddle flow switch
10gpm
What is the max delay of a paddle flow switch
2 minutes
Clearance required for a paddle flow on horizontal pipe
12 inches + the size of pipe (mounted on TOP of pipe)
Annunciator panel shall be located
At ground level, at the normal point the fire Dept. can access
Water level supervisory have ___ of fall and ____ rise
3 inches fall and 3 inches rise
Test and drain assemblies must have what size orifice installed in them
The equivalent to the smallest k factor head on the system
PS120 is typically installed as and on what system
Low pressure, wet system
PS40 is installed generally as what and on what system
Low air pressure, dry
PS10 is generally used as
Alarm switch
Gravity tanks do not require
High water level switch
Room temperature of valve room minimum is
40F
Water temp switch installed
24” below water level
Min and max for water temp switch
40F min Temp, 140F max temp
What water coloumn device automatically drains the water from the riser
Auto water column device
Minimum temperature for water reservoirs is
42F
Gravity tanks must have water level device installed ____ below the water
9 inches
Flow switch’s can be used on pipe 1-2” if you use
An adapter
Central Station signaling systems transmit a signal too
A constantly attended location located away from the property being supervised
Proprietary signal system sends alarm too
Constantly attended location that is on the property being supervised (something like a strip mall)
Auxiliary signal system sends alarm directly too
Fire department
Restoration signal is given from a valve when
The valve is Returned to its normal open position
When filing out a stem for a tamper switch, how deep is the groove
1/8”
What size and pipe thread is installed in a tank for the water level switch
1 1/2 National pipe thread
What kind of thermostat is in a water temperature switch
Bimettalic thermostat
Water temp device is to be installed how far from the water level device
12 inches
Number and type of alarms must be approved by
Insurance authority
Municipality
Fire department
Alarm valves connected to variable pressure water supply must have
Means of preventing false alarms
(EPP, retard chamber, external bypass)
Variable supply pressures include
Municipal water supply
Fire pumps
Max pressure for excess pressure pump
150psi
Relief valve max for excess pressure pump
130psi
Red hose on excess pressure pump goes too
Supply
If the paddle returns to normal position with a paddle switch what happens
Timer will reset
Remote station signalling send signal
Directly to fire dept. over private line
Red LED on panel Indicates
Alarm
Orange LED on panel indicates
Supervisory
Yellow LED on panel indicates
Trouble
Alarm equipment located outside must
Be listed for outside use
Fire alarm switches have 3 different contacts that are
Common (COM)
Normally Open (NO)
Normally Closed (NC)
WMG drains in 2 ways that are
-Out restricted orifice on alarm line
-1” drain from the discharge end of WMG
All pre action systems require
Pull stations (elec, hydraulic or pneumatic)
Deluge systems must have a means for
Manual release (hydraulic )
What can the paddle be made of in a paddle type switch
Thin metal or plastic
What kind of DPV requires a water column device
Low differential
Waterflow switches must active at
7psi
Alarm valves have alarm piping connection
Below the water seat
Dry pipe valves have alarm connection
Connected to intermediate chamber (which has atmospheric pressure during normal operation)
Alarm test connection is attached below the seat (supply)
WMG inspected and tested
Quarterly
Electric waterflow devices tested
Semi annually
Switch’s on sprinkler systems are usually wired
Normally open
Excess pressure pumps generally have there pressure set to ____ above city pressure
30-50 psi
PS10 pressure
4-15psi
