7
4.5.1 FOAM ASPIRATING ATTACHMENTS
To increase the expansion ratio, Task Force Tips "MX Foamjet" (model FJ-MX-HM) multi expansion attachment or LX Foamjet (model
FJ-LX-HM) low expansion attachment may be used with the Metro 1 nozzle and (model FJ-HMX) multi expansion attachment or LX
Foamjet (model FJ-H) low expansion attachment may be used with the Metro 2 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.
Many factors contribute to the extinguishment of a fire. Among the most important is delivering water at a flow rate sufficient to absorb
heat faster than it is being generated. The flow rate depends largely on the pump discharge pressure and hose friction loss. It can be
calculated using a hydraulic equation such as:
For additional information on calculating specific hose layouts, consult an
appropriate fire service training manual, such as IFSTA, or
, or call TFT's "Hydraulics Hotline" at 800-348-2686.
See www.tft.com for flow rates at various pump pressures.
A Guide to Automatic
Nozzles
PDP = NP+FL+DL+EL
PDP
NP
FL
DL
EL
= Pump discharge pressure in PSI
= Nozzle pressure in PSI
= Hose friction loss in PSI
= Device loss in PSI
= Elevation loss in PSI
5.0 USE OF METRO NOZZLES
IT IS THE RESPONSIBILITY OF THE INDIVIDUAL FIRE DEPARTMENT OR AGENCY TO DETERMINE PHYSICAL CAPABILITIES
AND SUITABILITY FOR AN INDIVIDUAL'S USE OF THIS EQUIPMENT.
6.0 FIELD INSPECTION
TFT's Metro is designed and manufactured to be damage resistant and require minimal maintenance. However, as the primary fire
fighting tools upon which your life depends, they should be treated accordingly.
Use with saltwater is permissible provided nozzle is thoroughly cleaned with fresh water after each use. The service life of the
nozzle may be shortened due to the effects of corrosion and is not covered under warranty.
Nozzle must be inspected for proper operation and function according to inspection checklist on last page
before each use. Any nozzle that fails inspection is dangerous to use and must be repaired before using.
Performance tests shall be conducted on the Metro nozzle after a repair, or anytime a problem is reported to verify operation in
accordance with TFT test procedures. Consult factory for the procedure that corresponds to the model and serial number of the
nozzle. Any equipment which fails the related test criteria should be removed from service immediately. Troubleshooting guides are
available with each test procedure or equipment can be returned to the factory for service and testing.
Factory service is available with repair time seldom exceeding one day in our facility. Factory serviced nozzles are repaired by
experienced technicians to original specifications, fully tested and promptly returned. Any returns should include a note as to the
nature of the problem, who to reach in case of questions and if a repair estimate is required.
WARNING
Any alterations to the nozzle and its markings could diminish safety and constitutes a misuse of this
product.
All Task Force Tip nozzles are factory lubricated with high quality silicone grease. This lubricant has excellent washout resistance and
long term performance. If your department has unusually hard or sandy water, the moving parts may be affected. Foam agents and
water additives contain soaps and chemicals that may break down the factory lubrication.
The moving parts of the nozzle should be checked on a regular basis for smooth and free operation, and signs of damage.
Any nozzle that is not operating
correctly should be immediately removed from service and the problem corrected.
IF THE
NOZZLE IS OPERATING CORRECTLY, THEN NO ADDITIONAL LUBRICATION IS NEEDED.
CAUTION
7.0 REPAIR
Factory service is available with repair time seldom exceeding one day in our facility. Factory-serviced nozzles are repaired by
experienced technicians to original specifications, fully wet tested, and promptly returned. Repair charges for non-warranty items are
minimal. Any returns should include a note as to the nature of the problem and whom to reach in case of questions.
Task Force Tips assumes no liability for damage to equipment or injury to personnel that is a result of user service.
Repair kits and repair parts are stocked for immediate shipment. Contact the factory or visit the website at www.tft.com for parts lists,
exploded views, test procedures and trouble shooting guides.
8.0 ANSWERS TO YOUR QUESTIONS
We appreciate the opportunity of serving you and making your job easier. If you have any problems or questions, our toll-free
"Hydraulics Hotline", 800-348-2686, is normally available to you 24 hours a day, 7 days a week.
©Copyright Task Force Tips, Inc. 2002-2008
LIN-040 October 28, 2008 Rev 05
