Task Force Tips VIT Instructions For Installation, Safe Operation And Maintenance page 5

Flows at specifi c pressures for each orifi ce size are as follows:
7/8" TIP
PRESSURE FLOW
PSI GPM
40 144
50 161
60 176
70 190
80 203
1-1/8" TIP
PRESSURE FLOW
PSI GPM
40 238
50 266
60 291
70 315
80 336
An inadequate supply of nozzle pressure and/or fl ow will cause an ineffective stream and can
DANGER
result in injury, death or loss of property. See fl ow chart in Figure 3.1 or call 800-348-2686 for
assistance.
4.0 FIREGROUND USE OF VIT 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.
Many factors contribute to the extinguishment of a fi re. Among the most
important is delivering water at a fl ow rate suffi cient to absorb heat faster
than it is being generated. The fl ow rate depends largely on the pump
discharge pressure and hose friction loss. The pump discharge pressure
can be calculated using a hydraulic equation such as:
For additional information on calculating specifi c hose layouts, consult an appropriate fi re service training manual such at IFSTA, A
Guide to Automatic Nozzles, or call TFT's "Hydraulics Hotline" at 800-348-2686.
©Copyright Task Force Tips, Inc. 2009-2015
15/16" TIP
PRESSURE FLOW
PSI GPM
40 165
50 185
60 202
70 218
80 234
1-1/4" TIP
PRESSURE FLOW
PSI GPM
40 294
50 328
60 360
70 388
80 415
5
1" TIP
PRESSURE
PSI
40
50
60
70
80
1-3/8" TIP
PRESSURE
PSI
40
50
60
70
80
PDP = NP + FL + DL + EL
PDP = Pump discharge pressure in PSI
NP = Nozzle pressure in PSI
FL = Hose friction loss in PSI
DL = Device loss in PSI
EL = Elevation loss in PSI
FLOW
GPM
188
210
230
249
266
FLOW
GPM
355
397
435
470
502
LIN-050 July 2, 2015 Rev01