Chapter 6 Sprinkler systems and standpipe operations

Question 1

Each normal sprinkler head flowing at 50 psi will deliver how many gpm?

Answer 1

40gpm

Question 2

If the main pressure drop and sprinkler is operating at 5psi what is the gpm

Answer 2

10gpm

Question 3

When supplying a FDC how many lines and what size is the minimum

Answer 3

two 2 1/2 lines

Question 4

What psi are most pumpers rated to discharge maximum rated pump capacity in volume

Answer 4

150 psi

Question 5

What is a new sprinkler piping system hydrostatically tested to?

Answer 5

200 psi

Question 6

What can cause false alarms in sprinkler systems?

Answer 6

Large fluctuation in pressure of the water supply

Question 7

What is the maximum delay an automatic system can be set for?

Answer 7

1 minute

Question 8

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

Answer 8

100 psi

Question 9

How does a pre action system differ from a deluge system

Answer 9

Uses closed sprinklers so water discharges only over the fire area

Question 10

What is the difference of the dry-pipe system valve vs the automatic wet system valve

Answer 10

dry pipe valve locks open

Question 11

What is water columning in dry pipe system

Answer 11

Water above the clapper valve is so high the valve fails to open and charge the system

Question 12

What flow is required to lock the clapper open and transmit the alarm in a dry pipe system

Answer 12

flow equal to one sprinkler

Question 13

What will happen if you pump water into the FDC and OS&Y is closed

Answer 13

no water will be feed into the system or zone

Question 14

What should the reconnaissance team deployed to the sprinkler room take with them?

Answer 14

forcible entry tools
bolt cutters
portable radio

Question 15

What is the recon team job do when entering the control room

Answer 15

Verify actual position of control valves

closed valves could indicate arson

Question 16

What is the general size of pressure tank on standby systems

Answer 16

2 to 5 thousand gallons usually last 30 minutes

Question 17

What is the most common sprinkler control?

Answer 17

OS&Y

Question 18

Where is the OS&Y usually located?

Answer 18

base of the sprinkler riser near the front of the building

Question 19

Which way do you turn the handle to open an OS&Y

Answer 19

counterclockwise

Question 20

If the center screw stem on an OS&Y is up which position is the valve

Answer 20

Open

Question 21

How can you gauge the amount the valve of an OS&Y is open or closed

Answer 21

the amount of stem protruding

Question 22

How can you tell if the valve on OS&Y is all the way open

Answer 22

the stem should be be above handle the same length as the diameter of the pipe

Question 23

In the sprinkler room how can you tell which is the main drain pipe

Answer 23

Usually a 2 inch pipe and will be the second biggest pipe in the room

Question 24

What type of valve is on the main drain in sprinkler room?

Answer 24

90 degree valve

Question 25

What are the 3 positions sprinkler heads are to be positioned?

Answer 25

upright pendant sidewall

Question 26

How are standpipe systems categorized by type?

Answer 26

Based on water supply

Question 27

What are the types of standpipes

Answer 27

``` automatic wet Automatic dry semiautomatic dry manual wet manual dry ```

Question 28

Every foot of water height exerts how much psi at the bottom

Answer 28

.434 psi

Question 29

How many psi per floor is estimated?

Answer 29

5 psi

Question 30

After 1993 maximum pressure at the top floor of a standpipe will be what?

Answer 30

100 psi where a occupant 1 1/2 hose is provided

Question 31

Which type of standpipe is primarily used by fire departments or others trained in handling heavy fire streams

Answer 31

Class 1

Question 32

This standpipe is designed for use by building occupants to control minor fires

Answer 32

Class 2

Question 33

What is the maximum outlet pressure NFPA 14 allows on 2 1/2 outlet on a standpipe

Answer 33

175 psi maximum, minimum of 100 psi

Question 34

What is a combination outlet control and pressure reducing valve called?

Answer 34

pressure reducing device

Question 35

How can the fire department bypass the pressure reducing device

Answer 35

Pull a pin similar to a fire extinguisher | Lift a tab

Question 36

The time it takes to respond to the building and set up for operations

Answer 36

Reflex time

Question 37

Building codes specify the use of standpipes based on what

Answer 37

Size of the building | usually 75ft in height or more than two stories of more than 20000 sq feet per floor

Question 38

When should firefighters never hook up to the standpipe

Answer 38

When the outlet is on the fire floor outside of the stairwell

Question 39

What is a good starting discharge pressure for standpipe operations

Answer 39

100 psi plus 5 psi per floor above grade | if using a fog nozzle start at 150 psi plus 5 per floor