Ch 7

Question 1

In a building on fire with an automatic fire suppression system, the primary tactic is to

Answer 1

Support the system and let it do its job.

Question 2

NFPA 13 R and NFPA 13 D reference installation for residential occupancies and Homes. The death rate and damage rate is how much lower in Homes protected by wet pipe sprinkler systems.

Answer 2

Death rate is 83% lower and damage is 69% lower than non-sprinkler protected residences

Question 3

An important part of NFPA 25 is to tag…

Answer 3

To tag a sprinkler system to show that it is removed from service and not functional

Question 4

The sprinkler system is most often encountered and is the most reliable fire suppression system is

Answer 4

The wet pipe sprinkler system

Question 5

Sprinkler systems that are used in areas that may be subject to freezing temperatures are

Answer 5

Dry pipe sprinkler systems

Question 6

The difference between a pre-action sprinkler system and a dry pipe sprinkler system is

Answer 6

They are both filled with air, but the pre-action system has a sensing device that opens the water valve.

Question 7

In both dry pipe and pre-action systems, if the piping capacity exceeds 500 gallons, the system must have

Answer 7

Must be equipped with an accelerator or exhauster to rapidly remove air from the system

Question 8

Deluge Systems protect areas with high fire potential, such as flammable liquids, aircraft hangers, and combustible commodities. A deluge system has these feature features.

Answer 8

Dry pipe system, all sprinklers are open, and a detector operated valve, which is normally closed. When this is opened, it allows water to fill the piping and discharge from all sprinklers.

A deluge system may also have a manually operated override valve

Question 9

If a decision must be made between using hose lines and properly supplying the sprinkler system, is best to

Answer 9

Supply the sprinkler system first.

If the sprinkler system is not achieving the desired results because of problems, water may be redirected to support hose lines

Question 10

The two most common types of main control valves used to open and close sprinkler systems

Answer 10

OS&Y outside stem and yoke
PIV post indicator valve

Question 11

It is poor practice to rely on remote annunciated panels to determine whether or not the fire pumps are running. You should.

Answer 11

Have a firefighter or two do a physical check of the pumps, and manually start the pumps if needed or directed by the IC

Question 12

According to the book, the minimum size hose line to connect to the FDC is

Answer 12

Two 2 1/2 inch or two 3 inch lines.

Question 13

The book recommends when connecting to an FDC for sprinkler Support you should pump 150 psi. Many sprinkler systems have a max design and tested pressure of.

Answer 13

175 psi

Question 14

The three options when connecting to a fire hydrant and supplying the building FDC are

Answer 14

Hand lay to the hydrant and to the FDC

Forward lay LDH and connect to the FDC

Relay pump with a supply pumper at the hydrant and an attack pumper

Question 15

If you encounter male threads on what is appearing to be the FDC, you should recognize this as

Answer 15

Either a test header, or a wall hydrant. This is not an FDC.

Question 16

When shutting down the sprinkler system, it is better to

Answer 16

Shut it down later than earlier, and have a firefighter prepared to turn it back on

Question 17

Even after the spring system has been shut down and restored and sprinkler heads replaced, the property owner should

Answer 17

Contact a licensed sprinkler contractor to inspect the system.

Question 18

NFPA 14 lists six major types of standpipe systems

Answer 18

Automatic dry
Automatic wet- the most common type
Semiautomatic dry
Manual dry
Manual wet
Combined system- contains both sprinklers and standpipes
Wet standpipe system

Question 19

NFPA 14 also defines three types of standpipes

Answer 19

Class 1- 2 1/2 inch connections
Class 2 - 1 1/2 inch connections and hose stations
Class 3 - both 1 1/2 and 2 1/2 connections

Older codes specified 65 psi, modern codes require 100 psi

Question 20

Two intakes at the FDC indicate a flow of

Answer 20

Greater than 500 gallons per minute

Question 21

The difference between manual wet/dry and automatic wet/dry standpipe systems are

Answer 21

Manual systems require water to be supplied to the FDC. Automatic systems are connected to a water supply all the time.

Question 22

According to the book, how much should you allow for friction loss in standpipe system?

Answer 22

10 to 15 psi friction loss is adequate for standpipe system piping

Question 23

Book minimums for standpipe operations

Answer 23

150 feet of 2.5” hose
50 feet of 1.75” hose
100 GPM
1.25-1.125” smoothbore nozzle

7/8 or 15/16 smoothie bar in conjunction with 1.75” attack hose

Question 24

Non-water based extinguishing systems include

Answer 24

Foam
Halon/clean agents
Carbon dioxide
Dry chemical
Other systems using inert gases

Question 25

Low expansion foam systems are usually found at these properties

Answer 25

Properties storing large quantities of flammable and combustible liquids. Refineries and petroleum storage depots may also have a foam house located on the property

Question 26

Foam is the number one defense against

Answer 26

Class B Flammable liquid fires, but is nearly useless on pressurized liquids or gases. Foam will not suppress three dimensional fires

Question 27

Two types of carbon dioxide systems? and concentrations?

Answer 27

Total flooding and local application Total flooding systems require concentrations between 34% to 75% Carbon dioxide is heavier than air

Question 28

Halon is not considered toxic. The toxic property of halon is based on.

Answer 28

The product of its decomposition. These hydrogen combinations are harmful to human humans and may damage some electronic components. Halon 1301is the ozone depleting chemical

Question 29

Regarding dry and wet chemical systems, each are typically used for:

Answer 29

A common use of dry chemical is kitchen hoods, dip tanks, and gasoline dispensing facilities Wet chemical agents are also used with cooking or kitchen systems, to contain grease or oil fires.

Question 30

After complete extinguishment and rescue, areas with clean agents may have depleted oxygen levels. Overhaul operations must be completed, in full PPE, especially when.

Answer 30

When class a materials are involved. Otherwise rekindles may occur.

Question 31

In regards to fire suppression systems, interlocks may be tripped when they’re activated. Interlocks refer to.

Answer 31

Interlocking devices are designed to shut down fuel systems, electrical systems, and processes such as conveyor or manufacturing. Total flooding systems may have pre-action alarms interlocked to the system

Question 32

False alarms can cause apathy and apathy can cause complacency. False alarms are off the result of

Answer 32

Poor system maintenance or improper installation.

Question 33

The primary tactic of buildings with automatic suppression systems are to support the system and let them do their job. When supporting the systems, you should.

Answer 33

Not take water away from the sprinkler systems Back up the system with hoselines and ventilate

Question 34

A draft curtain is a wall designed to limit horizontal spread of the fire that extends partially down…

Answer 34

Usually no more than 20% of the height of the compartment from the underside of the roof/ceiling

Question 35

A pre-action sprinkler system uses what type of valve

Answer 35

Uses a deluge valve instead of a dry pipe valve. This requires activation of a secondary device before the pipes filled with water.