Test 3 Flashcards
Class A Foam Concentrate Percentages Vs. Class B
- Class A: 0.1% to 1%
- Class B: 3% to 6%
AFFF
-Synthetic, great vapor barrier
Alcohol Resistant Foam
-Alcohols and polar solvents will not dissolve foam
Fouroprotein Foam
-Made from animal by-products, fast spreading film
Foam Tetrahederon
-Mechanical Agitation, Water, Air, Foam Concentrate
Injectors
-Add foam concentrate under pressure, AFD uses
Low Exposure Foam
-Little entrained air, fog nozzle used
Medium to High
-Use aspirating nozzles
Steel Thermal Expansion
- 1” per 10’ at 1,000 degrees F
- 50’ section may elongate 4” at 1,000 degrees F
Spalling
-Steam expanding in concrete because of heat that causes sections to break off
Balloon-Frame Construction
- Popular between 1800’s-1940’s
- Continuous void spaces
- Prone to 90 degree collapse
Platform-Frame Construction
- Almost all modern wood-frame construction
- No continuous void spaces
- Exterior wall studs not continuous
Dead Load
-Weight of building
Live Load
-Weight of contents
Rafters
-Solid wood joists mounted in an inclined position
Truss
- Prefabricated wood/steel structural component composed of smaller components in a triangular configuration
- Parallel Chord Truss: Flat roof or floors
- Pitched Chord Truss: Sloping/pitched roof
- Bowstring Truss: Curved Roof
Party Walls
- Shared line between two properties
- Almost always load bearing
- Often a firewall
NFPA 80
-Standard for Fire Doors and Other Opening Protectives
NFPA 80 Designations for Fire Doors and Other Protective Openings
Class A: Openings in fire walls and in walls that divide a single building into fire areas
Class B: Openings in enclosures of vertical communications through buildings and in 2-hour-rated partitions providing horizontal fire separations
Class C: Openings in walls or partitions between rooms and corridors having a fire-resistance rating of 1 hour or less
Class D: Openings in exterior walls subject to severe fire exposure from outside the building
Class E: Openings in exterior walls subject to moderate or light fire exposure from outside the building
Axial Load
-Straight Down The Middle
Eccentric Load
-Down and off to the side
Torsional Load
-Twisting
Parts of Hydrant
Barrel, bonnet, stem nut, main valve, Drain holes, operating stem, 2.5 inch connections, 4.5 inch steamer port
Fire Enclosure
-Fire rated assemblies that enclose interior vertical openings
NFPA 80
-Standard for Fire Doors and Other Opening Protectives
NFPA 10
- Fire Extinguishers
- Extinguishers < 40 lbs: Mounted up to 5’ from top
- Extinguishers > 40 lbs: Mounted no more than 3’ from top
- Bottom of extinguisher at least 4” from floor
6 Steps for Extinguishing Fire
- Locate Fire
- Select Proper Ext.
- Transport Ext.
- Activate Ext.
- Apply Ext. Agent
- Ensure your personal safety
Class D Extinguisher
- Dry Powder
- Forms solid crust over metal
- NACL or Graphite Powder
NFPA 1142
-Standard on Water Supplies for Suburban and Rural Firefighting
3-Parts of Municipal Water System
- Water Sources
- Water Treatment Facilities
- Water Distribution System
Dead-End Water Main
-Supply water from one direction
Static Pressure
- Pressure in system when water is not moving (potential energy)
- Measure by placing pressure gauge on hydrant port and opening valve without flowing water
Normal Operating Pressure
- Amount of pressure in water distribution system during normal consumption
- Measured by pressure gauge connected to hydrant during normal use period
Residual Pressure
-Amount of pressure that remains in system when water is flowing
Elevation
- Add 5 PSI per elevated 10 feet
- Subtract 5 PSI for negative 10 feet
NFPA 1901 on Class A Pumper
- 750-2,000 gpm a minute in 250 gpm increments
- Pump from draft at a rate of 100% of rated capacity at 150 psi
- 70% rated capacity at 200 psi
- 50% rated capacity at 250 psi
