DUCOT – Heavy Attack 2020
Rural Fire Brigades Association Queensland
Revision 1.0, 11/2020 Page 70 of 132
13.6 Compressed Air Foam System (CAFS)
The CAFS unit uses a liquid solution that is mixed with compressed air and water to deliver a fire
suppressant foam that can coat and cling to most surfaces. Use the Hose Reel and Delivery 3 Wet
/ Dry switches and displays to adjust the consistency of the foam to suit the task. The foam drum
locker (Off Side Rear Under Tray Locker) can carry three, twenty-litre foam drums. The foam
drums can attach directly to a dedicated foam intake inside the foam drum locker. There is a
25mm Storz Foam Induction Pickup Point on the off-side rear of the appliance to draw foam
solution from an external source. CAFS is available from the NS Hose Reel or via Delivery 3, a
dedicated 64mm QRT fitting at the Plumbing Manifold. A CAFS Temperature Warning Light will
illuminate if the system reaches 105°C to alert the operator to throttle back or turn off the system.
Refer to Figure 84: CAFS Controls on Page 71.
1.
Start the Pump Engine. Refer to section 13.2.6 on Page 59.
2.
Set CAFS Compressor switch to RUN position.
3.
Prime the pump. See section 13.2.2 on Page 53.
4.
Turn on the Volume Pump (Low-Pressure) and adjust the throttle to 700kPa pump
pressure.
5.
Set the Foam Proportioner to 0.3%
6.
Turn on the Foam Valve
7.
Set the CAFS Wet/Dry to Wet (Over 25 on the display).
8.
Turn on the CAFS Air Valve to the desired outlet – Hose Reel / Delivery 3
9.
Commence spraying by opening the CAFS Nozzle Branch.
10.
Adjust the CAFS Wet/Dry Valve to set the required foam consistency.
11.
Adjust the Pump Engine RPM to maintain 700kPa
