St Chpt 7 Flashcards
If the building or area that is on fire is equipped with an automatic fire suppression system the primary tactic is to ________.
Support the system and let it do its job
_________ is essential for any building that is protected by an automatic fire suppression system, with the possible exception of a building containing a range hood system as the only fire protection system
Pre incident planning
The primary purpose of these life safety systems is to allow _______
Additional escape time
When the system or part of the system is out of service, the system should be ________ as specified in NFPA 25
Tagged
The system that is most often encountered in the ________, which is very effective and the most reliable fire suppression system.
Wet pipe sprinkler system
A_____ is used in areas that might be subject to freezing temperatures.
Dry pipe sprinkler system
A______ is also filled with air that may or may not be under pressure.
Pre-action sprinkler system
In both systems if the capacity of the piping exceeds 500 gallons the system must be equipped with an _______.
Accelerator or exhauster
Can be used when a warning is Desired before the actual water discharge, such as in computer rooms.
Preaction systems
With this system there is no water in the sprinkler piping, and all sprinklers are open.
Deluge system
Protect areas with high challenge fire potential, such as flammable liquids, conveyors moving combustible commodities, and transformers.
Deluge systems
The most common operational error at properties protected by automatic sprinkler systems is _________.
Shutting down the system prematurely
If a decision must be made between using hose lines and properly supplying the sprinkler system, it is usually best to ______.
Supply the sprinkler system
Several types of main valves are used to open and close sprinkler systems. The two most common type are the________.
Outside stem and yoke valve and post indicator valve
The firefighter who is assigned to the main control valve may also be in a position to monitor the fire pump. In many cases the fire pumps are located near the main control valve. This is an important position that should not be relegated to a part time task, requiring the firefighter to walk a considerable distance between the riser and pumps.
A good rule of thumb is to separate the tasks if the pumps cannot be seen or heard by someone standing at the main control valve.
Most departments provide a pressure of ______ psi to the FDC.
150 psi
It is important to avoid surges when initially charging the hoses connected to the FDC, as , many sprinkler systems are designed and tested to a maximum _______.
175psi
Some large area, sprinkler protected buildings are equipped with automatic or manual roof vents and ________ that are designed to limit fire spread.
Draft curtains
When possible, property conservation tasks should be accomplished while _______ is in progress.
Extinguishment
Is not an automatic fire suppression system.
Standpipe system
In this system, piping is filled with pressurized air or nitrogen but is connected to a water supply that automatically admits water into the system when a discharge is opened.
Automatic dry
In this system, piping is filled with water, and water is provided when the discharge is opened. This is the most common standpipe.
Automatic wet
In this system a dry standpipe admits water into the system piping upon activation of a remote control device located at a hose section.
Semi automatic dry
This system is filled with air and does not have a water supply; the system relies entirely on water provided via the FDC to supply hose lines.
Manual dry
This system is filled with water connected to a water supply that maintains water in the system, but it is not capable of providing water for firefighting purposes unless it is supplied by a fire department pumper.
Manual wet
This system supplies both sprinklers and standpipes
Combined system
A standpipe system having piping containing water at all times
Wet standpipe system
Older codes generally specify _____ at the standpipe outlet, whereas modern codes usually require _____
65 psi
100 psi
In most operations, an allowance of _____ of friction loss is adequate for the standpipe system piping
10 to 15 psi
The laws of hydraulics tell us that there is ______ for every 1ft of elevation.
0.434 psi
In the 60 story high rise building each floor is 10 ft high, yielding a back pressure of _______ at the base of the building
256 psi
In the book firefighting principles and practices, William E Clark presents a method of dealing with excess hose. Hose is _____ the stairway above the fire floor before firefighters enter the floor.
Laid up
In many cases, only one stairway has standpipe outlets, making it____.
It the obvious choice as the fire operations stairway
The proper use of in place suppression devices is yet another reason for ________.
Preincedent planning
Is the number one defense against flammable liquid fires but is nearly useless on pressurized liquids or gases
Foam
Increases the effectiveness of water and adheres well to exposed structures
Class A
Is used in areas where preventing water damage is a prime objective or where the extinguishing agent is more effective than water or dry chemical.
Carbon dioxide
Are dependent on agent containment for a period of time to be effective
Total flooding systems
Carbon dioxide Extinguishes by depleting the oxygen supply, and a carbon dioxide system generally requires carbon dioxide concentrations ranging from ______.
34% to 75%
Systems rely on smoke detection for activation
Fix clean agent systems
Most _____ do not require suffocating quantities to extinguish the fire; a low concentration is usually sufficient.
Clean agents
Are used in a number of different applications. One of the most common is in kitchen hoods in restaurants.
Dry Chemical systems
A _____ can be activated either automatically or manually at a pull station.
Kitchen hood system
Similar in design to dry chemical systems, are also found in kitchen hood applications.
Wet chemical agent systems
React with hot grease or oil to form a foam blanket that suppresses the release of combustible vapors
Wet chemical agents
Carbon dioxide systems and many clean agent systems have _____ interlocked to the system, allowing occupants time to escape
Pre action alarms
Property owners often prefer _______ because cleaning up after the system discharges is much easier than with dry chemical agents
Wet agent systems
In _______ it is common for dry chemical systems also to protect the ductwork leading from the cooking appliances to where it exhausts outside of the building
Kitchen hood systems
are also equipped with manually operated override valves that can be used of detection devices fail to operate
Deluge systems
One method of checking for water flow, of the riser is not equipped with a device such as a water motor gong, is to ______ and listen for water flowing through the pipe
Place an ear against the riser
If there are signs of a fire and or the sprinkler is operating, the main objective is to ______ while ensuring occupants are safe
Support the system
Fire and building codes require _____ on standpipes
Female connections
It is better to shut down a sprinkler system _____ than too early
Too late
When changing from a variable stream to a smooth bore nozzle, it is important to recognize that there may be a significant increase in flow with a resultant increase in
Nozzle reaction
Most fire departments have standing orders requiring connections to the standpipe ______ below the fire.
One floor
