Positional Requirements; Liquid Temperatures/Cooling - Grundfos SQ Installation And Operating Instructions Manual

4.2 Positional requirements

The pump is suitable for vertical as well as horizontal
installation, however, the pump shaft must never fall
below the horizontal plane. See fig. 2.
Fig. 2
If the pump is to be installed horizontally, e.g. in a
tank, and there is a risk that the pump might be
covered by mud, it must be fitted in a flow sleeve.
For installation depths, see section
depths.

4.3 Liquid temperatures/cooling

Figure 3 shows an SQ/SQE pump installed in a
borehole. The pump is operating.
Figure 3 illustrates the following:
• borehole diameter
• pump diameter
• temperature of pumped liquid
• flow past the motor to the pump suction strainer.
8
Allowed
Not allowed
6.8.2 Installation
Liquid
temperature
Fig. 3
To ensure sufficient cooling of the motor, it is
important to observe the maximum liquid
temperature of 35 °C under all conditions.
The borehole diameter must be at least
76 mm (approx. 3").
The motor should always be installed above the well
screen. If a flow sleeve is used, the pump may be
installed freely in the borehole.
Do not let the pump run against a closed
discharge pipe for more than 5 minutes.
When the discharge pipe is closed, there
is no cooling flow and there is a risk of
overtemperature in motor and pump.
If the actual temperature of the pumped liquid
exceeds the specified value or the operating
conditions otherwise fall outside the specified
conditions, the pump may stop. Please contact
Grundfos.
Borehole
diameter
Pump
diameter