Flush Control; Use With Foam; Foam Aspirating Attachments - Task Force Tips FM Series Instructions For Safe Operation And Maintenance

4.2 FLUSH CONTROL

Small debris may get caught inside the nozzle. This trapped material will cause poor stream quality, shortened reach and
reduced flow. To remove this trapped debris the nozzle can be flushed as follows; while still flowing water, turn the
SHAPER counterclockwise past the full fog position (increased resistance will be felt on the SHAPER as the nozzle goes
into flush). This will open the nozzle allowing debris to pass through. Rotate the SHAPER clockwise and out of flush to
continue normal operation. During flush the nozzle reaction will decrease as the pattern becomes wider and the pressure
drops. The nozzle operator must be prepared for an increase of nozzle reaction when returning the nozzle from the flush
position to retain control of the nozzle.
WARNING

4.3 USE WITH FOAM

The Metro II tip only nozzle may be used with foam solutions. Refer to fire service training for the proper use of foam.
WARNING
WARNING
WARNING

4.3.1 FOAM ASPIRATING ATTACHMENTS

To increase the expansion ratio, Task Force Tips "MX Foamjet" (model FJ-HMX) multi expansion attachment or LX
Foamjet (model FJ-H) low expansion attachment may be used with the Metro II nozzle. These foam tubes attach and
detach quickly from the nozzle. Note: As expansion ratio is increased, the reach of the nozzle will be decreased due to the
greater amount of bubbles in the stream and their inability to penetrate the air. Generally the reach with foam is
approximately 10% less than with water only. Actual results will vary based on brand of foam, hardness of water,
temperature, etc. See Foamjet instruction manual for specific information.
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©Copyright Task Force Tips, Inc. 2002
Large amounts or pieces of debris may be unflushable and can reduce the flow of the
nozzle resulting in an ineffective flow. In the event of a blockage, it may be necessary
to retreat to a safe area, uncouple nozzle and remove debris.
For Class B fires, lack of foam or interruption in the foam stream can cause a break in the
foam blanket and greatly increase the risk of injury or death. Assure that:
!
Application rate is sufficient (see NFPA 11 or foam manufacturer's
recommendations).
!
Enough concentrate is on hand to complete task (see NFPA for minimum duration
time requirements).
!
Foam logistics have been carefully planned. Allow for such things as:
!
Storage of foam in a location not exposed to the hazard it protects.
!
Personnel, equipment and technique to deliver foam at a rapid enough rate.
!
Removal of empty foam containers.
!
Clear path to deliver foam, as hoses and other equipment and vehicles are
deployed.
Improper use of foam can result in injury or damage to the environment. Follow foam
manufacturer's instructions and fire service training to avoid:
!
Using wrong type of foam on a fire, i.e. Class A foam on a Class B fire.
!
Plunging foam into pools of burning liquid fuels.
!
Causing environmental damage.
!
Directing stream at personnel.
There is a wide variety of foam concentrates. Each user is responsible for verifying that
any foam concentrate chosen to be used with this unit has been tested to assure that the
foam obtained is suitable for the purpose intended.
LIN-040 April 2, 2002 Rev 0