Hoses Flashcards
Small Diameter Hose
- 1”-2”
- 3/4” to 1” “booster line” used for small outdoor fires
Supply Hose vs. Attack Hose
- Supply carries large quantities at low pressure
- Attack carries less quantities at high pressure
- Attack hose 50’ sections
- Supply hose 100’ sections
Medium-Diameter Hose
- 2 1/2” to 3”
- Supply lines or attack lines
Large-Diameter Hose
-3 1/2” to 6”
Hose Construction
- Inner waterproof layer with one or two outer layers
- Outer layers withstand pressure/protect from abrasion
Double-Jacket Hose
- Two layers of woven fibers
- Outer layer provides protection
- Inner layer provides strength
Rubber covered hose/Rubber jacket howe
-Durable, rubber like compound as outer covering
Hose Liner
- Inner part of hose
- Prevents water from leaking out
- Smooth inside surface to reduce friction
1 1/2” and 1 3/4” Attack Hose
- Pre-connected line from 150’ to 350’ ready for immediate use
- 1 1/2” between 60 and 125 gpm
- 1 3/4” between 120 and 180 gpm
2 1/2” Attack hose
- For big fires
- 250 gpm
- 350 gpm can be achieved, but it is difficult
Booster Hose
- Carried on hose reel that holds 150 to 200 feet of rubber hose
- Steel wire gives it rigid shape
Forestry Lines
-1 to 1 1/2”
Wye
- One hose stream to two hose streams
- Most common is one 2 1/2” line into two 1 1/2” hoselines
Water Thief
- Gated wye with additional 2 1/2” outlet
- Used primarily on attack lines
Siamese
- Two lines into one
- Most common combines two 2 1/2” sections into single line
Reducer
-Attaches smaller diameter hose to larger diameter hose
3 Groups of Nozzles
- Low Volume: 40 gpm or less
- Handline: 40 to 350 gpm
- Masterstream 350 + gpm
Nozzle Control Valves
- Ball
- Slide
- Rotarty
Types of Nozzle Patterns
- Fog
- Solid
- Broken
Smoothbore Nozzle
- Discharge oriface should be no more than half the size of the hoseline
- 50 psi handline, 80 psi for master stream
Advantages: longer reach, more penetration, less nozzle reaction
Disadv: Does not absorb heat as well as a fog nozzle
Not as effective for hydraulic ventilation
Can’t change pattern
Fog Nozzles
- Operate at 100 psi
- Finely distributed water droplets, absorbs heat well,
- Water curtain protects firefighters
- Can spread fire if used incorrectly
Fire Stream
-Stream of water or other extinguishing agent after it leaves a fire hose and nozzle until it reaches the desired point.
Conditions That Influence Fire Stream As It Leaves Nozzle
- Operating pressure
- Nozzle Design
- Nozzle Adjustment
- Condition of Nozzle or Orifice
Conditions That Influence Fire Stream After It Leaves Nozzle
- Velocity
- Gravity
- Wind
- Friction of Air
Elements of a Fire Stream
- Pump
- Hose
- Nozzle
- Water
Flow
-Volume of water being moved (gpm)
Pressure
-Amount of energy in a body or stream of water
