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English (US)
3.3.3 Inlet pressure requirements
The pressure required at the inlet of the pump is
a function of the temperature of the water as
shown in Table B.
In a pressurized system, the required inlet
pressure is the minimum allowable system
pressure.
In a system open to the atmosphere, the
required inlet pressure is the minimum distance
the pump must be located below the lowest
possible water level of the water source (tank,
pool, etc.).
Table A: Maximum water temperature
Ambient temperature
+104 °F
(+40 °C)
+120 °F
(+48 °C)
+140 °F
(+60 °C)
+160 °F
(+71 °C)
+175 °F
(+79 °C)
Water temperature
All UP*
+230 °F
(+110 °C)
+220 °F
(+104 °C)
+210 °F
(+98 °C)
+190 °F
(+87 °C)
+175 °F
(+79 °C)
* Exceptions below:
UPS 15-35
+165 °F
(+73 °C)
+140 °F
(+60 °C)
-
-
-
UP 15-100F
+205 °F
(+96 °C)
+195 °F
(90 °C)
+185 °F
(+85 °C)
+175 °F
(+79 °C)
-
UP 26-120U
+205 °F
(+96 °C)
+195 °F
(90 °C)
+185 °F
(+85 °C)
+175 °F
(+79 °C)
-
UP 26-116
+150 °F
(+65 °C)
+140 °F
(+60 °C)
-
-
-
Table B: Minimum required inlet pressure
Water temperature
230 °F
(110 °C)
190 °F
(88 °C)
140 °F
(60 °C)
Inlet pressure in feet (m)
36 ft
(1.10 m)
9 ft
(2.8 m)
3 ft
(0.9 m)
Inlet pressure in psi (bar)
15.6 psi
(1.07 bar)
4.0 psi
(0.27 bar)
1.3 psi
(0.08 bar)
