FS15-60-120 Rev0204
23
Pump Intake and Discharge Pressure Requirements
WARNING: If the recommended minimum pump discharge pressures
are not adhered to, the foam system may operate at partial capacity
or fail to inject foam.
Note:
It is recommended that standard operating procedure be to
gate the
pump input pressure at less than 20 PSI
and
adjust the discharge pressure
to more than 140 PSI
when foam is used.
For efficient operation around-the-pump foam proportioning systems require a
pump intake to discharge pressure differential. It is recommended that the pump intake
pressure be less than 20 PSI. If operation at a higher intake pressure is necessary the
pressure differential shown in Table 1 has to be adhered to.
Table 1. Pump Pressure Requirements
Pump Intake Pressure
Minimum Pump Discharge Pressure
0*
85
20
140
40
200
50
240
70
300
*Note:
When pumping in draft consider the intake pressure to be 0 PSI.
