Chapter 6 Sprinkler systems and standpipe operations Flashcards
Each normal sprinkler head flowing at 50 psi will deliver how many gpm?
40gpm
If the main pressure drop and sprinkler is operating at 5psi what is the gpm
10gpm
When supplying a FDC how many lines and what size is the minimum
two 2 1/2 lines
What psi are most pumpers rated to discharge maximum rated pump capacity in volume
150 psi
What is a new sprinkler piping system hydrostatically tested to?
200 psi
What can cause false alarms in sprinkler systems?
Large fluctuation in pressure of the water supply
What is the maximum delay an automatic system can be set for?
1 minute
In a dry-pipe system the differential dry-pipe valve has 30-40 psi on top and can hold back how much in water pressure
100 psi
How does a pre action system differ from a deluge system
Uses closed sprinklers so water discharges only over the fire area
What is the difference of the dry-pipe system valve vs the automatic wet system valve
dry pipe valve locks open
What is water columning in dry pipe system
Water above the clapper valve is so high the valve fails to open and charge the system
What flow is required to lock the clapper open and transmit the alarm in a dry pipe system
flow equal to one sprinkler
What will happen if you pump water into the FDC and OS&Y is closed
no water will be feed into the system or zone
What should the reconnaissance team deployed to the sprinkler room take with them?
forcible entry tools
bolt cutters
portable radio
What is the recon team job do when entering the control room
Verify actual position of control valves
closed valves could indicate arson
What is the general size of pressure tank on standby systems
2 to 5 thousand gallons usually last 30 minutes
What is the most common sprinkler control?
OS&Y
Where is the OS&Y usually located?
base of the sprinkler riser near the front of the building
Which way do you turn the handle to open an OS&Y
counterclockwise
If the center screw stem on an OS&Y is up which position is the valve
Open
How can you gauge the amount the valve of an OS&Y is open or closed
the amount of stem protruding
How can you tell if the valve on OS&Y is all the way open
the stem should be be above handle the same length as the diameter of the pipe
In the sprinkler room how can you tell which is the main drain pipe
Usually a 2 inch pipe and will be the second biggest pipe in the room
What type of valve is on the main drain in sprinkler room?
90 degree valve
What are the 3 positions sprinkler heads are to be positioned?
upright
pendant
sidewall
How are standpipe systems categorized by type?
Based on water supply
What are the types of standpipes
automatic wet Automatic dry semiautomatic dry manual wet manual dry
Every foot of water height exerts how much psi at the bottom
.434 psi
How many psi per floor is estimated?
5 psi
After 1993 maximum pressure at the top floor of a standpipe will be what?
100 psi where a occupant 1 1/2 hose is provided
Which type of standpipe is primarily used by fire departments or others trained in handling heavy fire streams
Class 1
This standpipe is designed for use by building occupants to control minor fires
Class 2
What is the maximum outlet pressure NFPA 14 allows on 2 1/2 outlet on a standpipe
175 psi maximum, minimum of 100 psi
What is a combination outlet control and pressure reducing valve called?
pressure reducing device
How can the fire department bypass the pressure reducing device
Pull a pin similar to a fire extinguisher
Lift a tab
The time it takes to respond to the building and set up for operations
Reflex time
Building codes specify the use of standpipes based on what
Size of the building
usually 75ft in height or more than two stories of more than 20000 sq feet per floor
When should firefighters never hook up to the standpipe
When the outlet is on the fire floor outside of the stairwell
What is a good starting discharge pressure for standpipe operations
100 psi plus 5 psi per floor above grade
if using a fog nozzle start at 150 psi plus 5 per floor
