©Copyright Task Force Tips, Inc. 2009-2015
LIN-050 July 2, 2015 Rev01
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
15/16” TIP
PRESSURE
FLOW
PSI
GPM
40
165
50
185
60
202
70
218
80
234
1” TIP
PRESSURE
FLOW
PSI
GPM
40
188
50
210
60
230
70
249
80
266
1-1/8” TIP
PRESSURE
FLOW
PSI
GPM
40
238
50
266
60
291
70
315
80
336
1-1/4” TIP
PRESSURE
FLOW
PSI
GPM
40
294
50
328
60
360
70
388
80
415
1-3/8” TIP
PRESSURE
FLOW
PSI
GPM
40
355
50
397
60
435
70
470
80
502
DANGER
An inadequate supply of nozzle pressure and/or fl ow will cause an ineffective stream and can
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:
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
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.
