Quiz Notes Flashcards
How many outlets do residential hydrants have
Residential: (1) 2 1/2” (1) 4”
Commercial: (1) 2 1/2” (2) 4”
What type of water system supplies the city of San Diego
Combination system gravity fed grid loop system
Fire hydrants are spaced approximately how many feet apart
600 feet
The hydrant is positioned with what outlet facing the street
4”
Requirements for clearance around a hydrant
Lowest outlet minimum 18 inches above ground. No obstructions can be within 3 feet. No parking within 15 feet.
What type system only reports on premise
Local alarm
Central station, proprietary, and remote station alarm system are examples of what alarm system
Monitored alarm system
Types of manual alarm devices
Single and dual action
Automatic alarm systems
Heat, smoke and gas detectors
Ionization smoke detector
Positive and negative ions are measured on an electrically charged electrode. Smoke enters the chamber, the flow of ions to the electrode changes and the alarm is activated
What type of alarm uses a beam of light with a sensor to detect smoke particles
Photoelectric smoke detector
Class one standpipe
Required in buildings more than how many stories above or below ground. Three stories
Class one standpipes having minimum of how many FDC’s at street level
2
How much PSI is required at the most remote outlet
65 psi pre 1993
100 psi post 1993
What system that utalizes a provided 1 1/2” hose connection , 100 ft of hose and a 50 gpm nozzle for occupant use
Class 2
Class III standpipe systems are required to deliver how many PSI pre/post 1993 per NFPA 14
100 psi pre/ 175 psi post
Automatic dry systems
Filled with pressurized air. Connected to a water supply to flow water once hose valve is open
Semi automatic dry systems
Airfield may or may not be pressurized. Use of deluge valve
FDC checks
Gasket, swivel, thread, obstruction, Clapper
Four categories of water based fire protection systems
Wet, dry, pre-action, deluge
Easiest and most common system
Wet pipe system
How many GPM’s are discharged in a industrial manufacturing sprinkler
20-40 gpm
Indicating valve
Os&y, post indicator valve piv, wall post indicator valve, indicating butterfly valve
Most common type of non-indicating valve
Globe valve
Two types of operating elements for fire sprinklers
Fusible link and frangible bulb
3 million
Gallons per day
Dry and wet barrels
Sd uses wet barrels
Transmission and distribution
16-66” transmission lines looped to form grid, from supply to distribution.
8-16” distribution lines, smaller grid system
White painted or unpainted hydrants
Low pressure/high volume utilized to maintain water pressure in the mains during repairs or large scale emergencies
Monitored alarm systems can be categorized as the following
Central station, proprietary, remote station
Sprinklers most water-based fire protection systems fall within one of four categories
Wet pipe
Dry pipe
Pre action
Deluge
Atypical sprinkler use for industrial manufacturing occupancies discharges about
20-40 gpm
Sprinkler activation will do less damage than the fire department ostream which provides approximately
250 gpm
A sprinkler system is described as a combination of underground and overhead piping that is connected to an automatic water supply and is installed throughout the building
Yup
Pre-action sprinkler systems are specialized for use in locations where accidental activation is undesired such as
In museums with the rare artworks, manuscripts, or books, and data centers, for protection of computer equipment from accidental water discharge
There are two main subtypes of pre-action systems
Single interlock, and a double interlock
Single interlock system
The system is he sensually converted from a Dry system into a wet system
Double interlock system
The operation of double interlock systems is similar to deluge systems except that automatic sprinklers are used
Deluge systems
Systems in which all sprinklers connected to the water piping system are open, in that the heat sensing operating element is removed. Used for special hazards where rapidfire is a concern
Sprinkler temperature ratings
The exact operating temperature is regulated by adjusting the amount of liquid and the size of the bubble when the bulb is sealed
Sprinkler system control valves
Control valves are used to shut off the water supply to a fire sprinkler system control valves should remain in the open position at all times with the exception of systems modification or maintenance
Fire protection pump system
Most fire pumps are found in the lower floors of the building and are either diesel or electrically powered. Modern pumps start automatically when the pressure in the system drops to a predetermined level to supply
Shutting down fire protection systems
As a general rule you should work from the activation and move backwards to the system towards the water supply source. Stop/plug the sprinkler head using sprinkler tongs, red wood plugs or door wedges
Non-water-based fire protection systems
Halogenated agents
Halon replacement agents and systems
Co2 systems
Chemical extinguishing systems
Dry chemical, wet chemical, foam
What is a standpipe
Standpipe systems are fixed piping systems with associated equipment that transports water from a reliable water supply to designated areas of buildings warehouses can be deployed for firefighting
Combined systems are simply class one or class III standpipe systems that also
Supply water to the sprinkler system
Class three systems pressure regulating devices are required when
Outlet pressure exceeds 175 PSI
In the event that the buildings you are supplying water to is over 20 stories in height
The triple jacket, high-pressure hose shall be used if available
