Terminologies in Sprinkler Systems Exam Solution Manual Rated A+
Heads - Answers series of nozzle like devices
Riser - Answers Vertical piping that feed the cross main and contain system control valves
Cross Mains - Answers serves the branch lines
branch lines - Answers where the sprinklers are directly installed
Three types of release mechanisms for sprinkler heads - Answers Fusible Links
Glass (frangible bulb)
Chemical Pellets
Types of sprinkler heads - Answers Upright
Pendant
Sidewall
Special Sprinkler Heads
Main Control Valves - Answers Outside Screw and Yoke (OS&Y)
Post Indicator Valve (PIV)
Post Indicator Valve Assemble ((PIVA)
Wall Post Indicator Valve (WPIV)
What are Control Valves? - Answers Control valves are valves used to cut off the water supply to the
system or zone when it is necessary to perform maintenance, change sprinkler heads, or interrupt
operation. These valves must be indication valves.
What is an OS&Y Valve - Answers Outside Screw and Yoke valves have a yoke on the outside with a
thread stem or screw. The threaded portion of the stem is out of the yoke when the valve is open and
inside when the valve is closed.
What is a PIV Valve? - Answers Post Indicator Valves are hollow posts. The valve stem has a target where
the words "open", "closed" or "shut" appear.
What is a WPIV? - Answers Wall Post Indicator Valves are the same as Post indicator valves except it is
located on the wall, most frequently in warehouses.
Where is the FDC location for the building? - Answers Outside wall of building where the riser room is
located.
, What are all the visible sprinkler components on the outside wall of the riser room? - Answers
What type of protection device will be seen on the FDC? - Answers Either plastic caps or knox caps
Why do FDCs have protection devices on them? - Answers To keep arsonists from interfering with the
device, as well as to keep birds out and to prevent people from stuffing debris inside
How do you get the caps off an FDC? - Answers Plastic caps can be center broken with a spanner
wrench. The eye bolts can also be pried off with the spanner. If knox caps, use the knox key.
Where will the knox key be located? - Answers Underneath the Officer's seat in the cab, and in driver 1
compartment
What pressure does the driver need to pump to when pumping to an FDC? - Answers 150 PSI + 5
additional PSI for each floor
If you are called out to a location for a water flow alarm and you discover that the water gong is ringing
with water flowing from its drain what would this indicate? - Answers Water is flowing somewhere in
the system.
If you are called to a location for a water flow alarm and arrive to find the water gong is silent but a
small puddle of water is on the ground under the drain what would this indicate? - Answers Possible
water surge in the system setting off a false alarm
The following are the four basic components that make up a sprinkler system. What do these each
do/what are they?
a) water supply main
b) riser
c) cross main
d) branch lines - Answers a) the actual water main itself from the city water system
b) vertical piping that feeds the cross main of the sprinkler system. This contains the control valves as
well
c) These go from the riser to the branch lines to supply the branch lines.
d) branch lines are smaller pipes that the sprinkler head is directly hooked to.
The riser connects to... - Answers The cross mains.
The cross mains connect to... - Answers the branch lines.
the branch lines connect to... - Answers sprinkler heads.
Heads - Answers series of nozzle like devices
Riser - Answers Vertical piping that feed the cross main and contain system control valves
Cross Mains - Answers serves the branch lines
branch lines - Answers where the sprinklers are directly installed
Three types of release mechanisms for sprinkler heads - Answers Fusible Links
Glass (frangible bulb)
Chemical Pellets
Types of sprinkler heads - Answers Upright
Pendant
Sidewall
Special Sprinkler Heads
Main Control Valves - Answers Outside Screw and Yoke (OS&Y)
Post Indicator Valve (PIV)
Post Indicator Valve Assemble ((PIVA)
Wall Post Indicator Valve (WPIV)
What are Control Valves? - Answers Control valves are valves used to cut off the water supply to the
system or zone when it is necessary to perform maintenance, change sprinkler heads, or interrupt
operation. These valves must be indication valves.
What is an OS&Y Valve - Answers Outside Screw and Yoke valves have a yoke on the outside with a
thread stem or screw. The threaded portion of the stem is out of the yoke when the valve is open and
inside when the valve is closed.
What is a PIV Valve? - Answers Post Indicator Valves are hollow posts. The valve stem has a target where
the words "open", "closed" or "shut" appear.
What is a WPIV? - Answers Wall Post Indicator Valves are the same as Post indicator valves except it is
located on the wall, most frequently in warehouses.
Where is the FDC location for the building? - Answers Outside wall of building where the riser room is
located.
, What are all the visible sprinkler components on the outside wall of the riser room? - Answers
What type of protection device will be seen on the FDC? - Answers Either plastic caps or knox caps
Why do FDCs have protection devices on them? - Answers To keep arsonists from interfering with the
device, as well as to keep birds out and to prevent people from stuffing debris inside
How do you get the caps off an FDC? - Answers Plastic caps can be center broken with a spanner
wrench. The eye bolts can also be pried off with the spanner. If knox caps, use the knox key.
Where will the knox key be located? - Answers Underneath the Officer's seat in the cab, and in driver 1
compartment
What pressure does the driver need to pump to when pumping to an FDC? - Answers 150 PSI + 5
additional PSI for each floor
If you are called out to a location for a water flow alarm and you discover that the water gong is ringing
with water flowing from its drain what would this indicate? - Answers Water is flowing somewhere in
the system.
If you are called to a location for a water flow alarm and arrive to find the water gong is silent but a
small puddle of water is on the ground under the drain what would this indicate? - Answers Possible
water surge in the system setting off a false alarm
The following are the four basic components that make up a sprinkler system. What do these each
do/what are they?
a) water supply main
b) riser
c) cross main
d) branch lines - Answers a) the actual water main itself from the city water system
b) vertical piping that feeds the cross main of the sprinkler system. This contains the control valves as
well
c) These go from the riser to the branch lines to supply the branch lines.
d) branch lines are smaller pipes that the sprinkler head is directly hooked to.
The riser connects to... - Answers The cross mains.
The cross mains connect to... - Answers the branch lines.
the branch lines connect to... - Answers sprinkler heads.
