©Copyright Task Force Tips LLC 2010-2021
5
LIU-360 October 14, 2021 Rev05
3.0 GENERAL INFORMATION
TFT’s 350 Series Eductors can be used with 1/2% Class A foam concentrate for wildland, rural, and urban fire suppression on Class A
fuels (wood, paper, combustible materials). Class A concentrates that have received USDA and USFS approval are recommended.
On class B materials, the eductors can be used with high viscosity 1%, 3%, 6%, 3x3%, and 3x6% Alcohol Resistant Class B
concentrates.
The eductor can also be used with plain AFFF concentrates rated at 1%, 3% or 6% with various freeze protected foams, and with FFFP
foam types. These foams generally have a lower viscosity than the calibration viscosity of the TFT eductor and will be inducted faster
than expected resulting in stronger concentrations. While this does not degrade foam quality, it does reduce the operation time for a
given foam supply. Testing should be done with the foam being used to assure accurate induction rate.
Standard inlet operating pressure is 200 psi on all TFT eductors (1400kPa/14 bar), except the low pressure versions marked for 150 psi
(1000kPa/10 bar).
3.1 USE WITH SALT WATER
Consult foam manufacturer’s documentation and training by the Authority Having Jurisdiction (AHJ) before mixing foam concentrate with
salt water.
If the equipment is used with salt water, it must be thoroughly cleaned with fresh water after each use. The service life of the equipment
may be shortened due to the effects of corrosion, and is not covered under warranty.
3.2 VARIOUS MODELS AND TERMS
TFT 350 Series Eductors are available in several flows and with a variety of inlet couplings. These must be specified at the time of order.
Consult the factory for special thread requests.
The eductor can be split into two parts by grasping the locking ring and retracting it fully to separate the metering head from the eductor
body. All the foam passageways can easily be inspected. The foam passageway into the eductor contains a free-floating check disk with
three fins. The check disk is pressure activated to keep water from coming out of the fire hose and back into the foam pail.
The metering head contains a red backflush button that can be depressed to open the check disk.
The metering head also has a large proportioning knob that can be rotated to align the ball valve to different detent positions. The 2.5”
eductors have five choices: Off, ½%, 1%, 3%, and 6%. Each foam setting has a precision sized metering orifice in the valve ball. The
eductor cannot be operated between settings, as the metering orifices will not line up properly. The setting of the proportioning knob
lines up with the white indicator ball.
Figure 3.2
CAUTION
Intermixing metering heads and eductor bodies of different flow rates can cause incorrect foam
strength, resulting in risk of injury as the ability to control the fire is compromised. Do not intermix
metering heads with eductor bodies of different flow rates.
EXIT
CHECK DISK
PROPORTIONING INDICATOR
1.0" CAMLOCK CONNECTION
FOR CONCENTRATE INTAKE HOSE
1.25" CONCENTRATE
INTAKE HOSE
EDUCTOR BODY
INLET
BACK PRESSURE INDICATOR
METERING HEAD
RETRACT THE LOCKER
RING TO UNLOCK.
RELEASE THE LOCKER
RING TO ENGAGE.
TURN KNOB TO SET
PROPORTIONING RATE.
PUSH BUTTON TO
BACK FLUSH.
