300s (306.05-309.14) Flashcards
How much 5” supply line do we carry?
1050
10 100 foot
1 50 foot
How is the 2 1/2 inch supply loaded on the back of the truck?
Two 200 foot sections
Left: 150 flat load 50 foot high rise pack male end at bottom
Right: 150 flat 50 foot high rise pack double female at bottom
What is a forward lay?
Wrap the hydrant and go (truck to not exceed 10mph)
What is the nozzle on the 2 1/2 handline?
1 3/16
What is evaluated at MCS?
1: Two 3 minute Company operations
2: Any other event BC wants
What is conventional construction?
1: Utilizes heavy lumber
2: Roof is made of 2x6 or larger
3: Decking is 1x6 sheating
4: More fire resistant
5: Pre 1960
6: Good for ventilation
What is the normal rafter spacing on a gable roof?
16-24 inches on center
What are hazards of a gable roof?
1: Possibly 2x4 rafters
2: Uses 1/2” plywood decking instead of sheating
3: Plywood burns and fails faster (little resistance to fire)
4: More difficult ventilation
5: Pre fab truss with gusset plate
What are strengths and hazards to hip roofs, and what ventilation technique?
Strength: Good burn time if conventional
Haz: Same as gable
Dicing and center rafter cut
Ridge pole is top, hip is angle down
What is a corrugated roof?
Steel, aluminum, or fiberglass over wood frame. Usually 18-20g steel
What are the strengths and hazards of corrugated roofs?
Strength: Ridge and where crosses outside walls
Hazards: RAPID FAILURE, Work from aerial if possible
What is a concrete roof?
Corrugated metal with a concrete layer over metal with a wire mesh, and a waterproof roofing material topper
What are the strength and hazards of concrete roof?
Strengths: Hard strong surface resistant to fire
Hazards: Difficult to penetrate (use rotary saw with masonry blades)
What are the strengths, hazards, and vent techniques for saw tooth roofs?
Strength: Good construction, area over vertical walls are safe
Hazards: Plywood decking (which can fail quickly)
Vent: Open hinged panels (this structure is designed for ventilation)
What are the Strengths hazards and vent techniques of a bridge truss roof?
Strength: Well constructed, area over perimeter and bridge are strong
Hazards: Metal tie rods may fail
Vent: Dice, center rafter cut
What is a bow strung roof?
Arch with tie rods and turnbuckles that provide lateral outside wall support
What are the strengths hazards and vent techniques for bow strung roofs?
Strength: This uses good lumber, perimeter and arches are strong
Hazards: Tie rods and buckles fail quickly, this causes the building to lose lateral support and collapse
Ventilation is extremely hazardous under fire conditions. You can dice or center rafter cut
What is a lamella summer bell roof?
1: Eggcrate or diamond pattern roof
2: 2x12 lumber steel plates and bolts at junctions
3: 1x sheathing
4: external truss or metal tie rods
5: Common for gymnasiums
What are the strengths hazards and vent techniques of Lamella summer bell roofs?
Strength: Good constructions, perimeter is strongest
Hazard: Total roof collapse if 20% or more is destroyed by fire (domino effect)
Vent: dice center rafter
What are the strengths and hazards a ribbed arch roof?
Strength: Well constructed, arch and perimeter strong
Hazard: Determined by size of lumbar, generally a strong roof
What are the four major components of panelized roofs?
1: Laminated beams
2: Purlins
3: 2x4 joists
4: 1/2” or 5/8” plywood decking
What are the strengths, hazards, and vent type for panelized roofs?
Strength: Perimeter, lam beams, purlins (if not light weight material
Hazards: Hollow steel pipes support roof, these are rarely protected from fire
Vent: Pullback or strip
DO NOT WALK anywhere but the lam beams and purlins
Dont vent over the fire
Lots of indicators holes
What are the strengths and weaknesses of open web roofs?
Strength: Perimeter
Weak: These are very hazardous for ventilation. Rapid failure if fire impingement.
Bottom cord unsupported
What are concerns for open web bar joists?
Ventilation difficult because of tar overlay. Must remove to get to roof material to cut
What is a wooden I beam roof?
Stem joined to top and bottom cords by glue with plywood nailed to it
How quickly can metal gusset plate roof fail when exposed to heavy fire?
1 minute 20 seconds
How can we learn what a “good” roof feels like?
Walk roofs in your area?
What signs indicate that a roof is failing?
1: Growing vents
2: Sound
3: Constantly feel
4: Look for deformity
5: Cut inspection hole
6: Cut indicator hole
What is included with a ventilation size up?
1: Type of construction and age
2: Location and extent of fire
3: Access to building
4: Height
5: Smoke amount direction and location
6: Side vents
7: Backdraft potential
How should we perform a vertical ventilation operation?
1: Ladder in a strong area away from windows doors etc
2: 2 means of escape
3: Approach from the uninvolved area
4: Ladders 5 to 6 rungs above
5: 2 FFs min
6: Work from weak to strong toward exit
How big should a heat hole be?
10% of involved room or rooms (error on larger side
What is a center hallway cut?
Cut over a hallway to relieve heat and smoke for egress
What is defensive ventilation?
Trench strip cut to get ahead of the fire. You can cut this but not open if you suspect you will be going defensive
What is dicing?
Cutting plywood where there is no concern for members underneath
How do we open windows for horizontal ventilation?
1: Open top windows on leeward side first
2: Lower on windward next
How can we cut thermoplastic windows?
carbide tipped rotary saw
Pick head axe
What do you need before putting a fan in service?
To control all openings
What will cause PPV to not work well?
Many windows broken or large hole in roof
How should a fan be placed for PPV?
1: 6 feel from opening
2: Tilt 20-30 degrees
3: Seal over entire opening
What if opening is too wide for 1 fan ppv?
Place fans side by side
What if you need two fans to create desired pressure?
Best to use 2 fans
One 2 feet from opening, second 6-10 feet from opening
How is PPV used with vertical vent?
1: Start fan and face away from opening
2: Cut hole punch through
3: Face fan to door
