CAF systeme

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Author:
jcross
ID:
305147
Filename:
CAF systeme
Updated:
2015-07-13 19:37:07
Tags:
2015 engineer exam
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Description:
CAF
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  1. Benefits of CAF
    • Faster knockdown and overhaul (rapid heat absorption)
    • Virtually no friction loss
    • Simple hydraulics
    • Can be pumped higher and farther than water
    • Lighter hose lines (70% weight reduction)
    • Not affected by kinks
    • Greater stream reach (due to high energy of compressed air)
    • Longer hose lays (up to 5000’ on level ground)
    • Uses less water
    • Less water damage
    • Reduced work load on firefighters
    • Increased firefighter safety
    • Excellent structure / exposure protection (dry foam insulates and protects)
    • Ability to create CAF fire breaks and barriers
    • Reduced scene times
  2. Type III CAF Task Force includes
    • 1 Task Force Leader
    • 3 Ultra XT Type III CAF engines
    • 1 Water Tender
    • Foam concentrate resupply vehicle
  3. Bump and run
    • “Bump and run” is a highly mobile tactic used in interface structure
    • protection. You don’t put down any more than 200 feet of hose on the
    • ground and you don’t hook up to a hydrant, so if the fire moves, you
    • move with it. (CALFIRE
  4. Foam and go (Pre-treat structures with CAF
    • “Foam and go” is used on a fast-moving interface fire and is the practice
    • of foaming a house and leaving it; to get out of the fire’s way or to move
    • on to foam or defend another house. It is often used when standing and
    • defending the house puts the firefighters at great risk or when many
    • houses can be protected by foaming. It requires engines equipped with
    • CAF systems.
    • o Depending on fuel type, you may have to hydrate Class “A” fuels with
    • wet foam first, then apply a layer of dry foam to cap and insulate the fuel
    • o In high wind conditions use wet foam only
    • o Foam as much of structure and surrounding area as possible with turret.
    • o Deploy hand line to foam areas not reached by turret
    • o Foam structure and 100’ clearance
    • o Pay special attention to eaves and vent covers
    • If applied correctly, the foam can provide protection for approx. 2 to 4
    • hours, sometimes longer
  5. What lines are used when using the CAF?
    • During pretreatment operations both 1 ½” and 1” lines may be employed. During ANY
    • type of firefighting, 1 ½” lines shall be the minimum size utilized.
  6. what are the hydraulics for the CAF
    • 100 psi for all hand lines
    • 140 psi for all master streams and turrets
  7. What percentage of CAF is used for "wet attack"
    • Open discharges fully
    • o Use 0.3% foam concentrate
  8. Dry foam is used for
    • creating fire breaks and to pre-treat vegetation and
    • structures
  9. Specs for using dry foam
    • Gate down discharges for dry foam (adjust as needed)
    • o Use 0.5% to 1.0% foam concentrate (adjust as needed)
    • o Adjust both until foam stream appears light and fluffy (CAF system is
    • capable of producing dry foam the consistency of shaving cream)
    • o Monitor “FLOW” gauge on Foam Pro
    • o Dry foam can be achieved with a “FLOW” of approx. 25-45 gpm
  10. “Dry foam” is also referred to
    “Dry foam” is also referred to as “Fluid foam
  11. Nozzles for CAF
    • Bumper turret
    • o Use 1 3/8” Elkhart 187CAF tip for CAF
    • o Use electric fog nozzle for water/foam solution only (not CAF) at 125 psi
    • 1” redline and 1” wildland hose
    • o 1” shut off butt
    • o No tip, shut off butt only (3/4” inner diameter)
    • 1 ½” and 1 ¾” hand lines:
    • o Use 15/16” straight tip for wet foam
    • o Use shut-off butt only with no tip for dry foam (1 3/8” inner diameter)
    • o Use pistol grip shut off butt (high initial nozzle reactions)
    • Portable monitor nozzles and ladder pipes:
    • o Use 1 ½” straight tip or larger
    • o Single 2 ½” supply line (Br29 and Br35 have 2 ½” CAF discharges)
  12. General Order of Operations for CAFS
    • Engage the pump with Auto-Sync in “Unload” or “Auto”
    • Ensure “Tank to Pump” valve is open with “Tank Fill” open slightly
    • Turn Foam Pro on to 0.3% for wet CAF or 0.5% to 1.0% for dry CAF
    • Place Auto-Sync in “AUTO” for CAF
    • Open discharge and air valve
    • Increase throttle to desired pressure
    • Gate down discharge for dry foam (and increase foam %)
    • Adjust water pressure, GPM flow and foam % as needed

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