Stuart Turner CH 4-30 B - Manual (Page 10)

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2.30 Non-Preferred Pump Location: The pump must be located with at least 1 metre
flooded suction at all times.
If it is not possible to locate the pump in the preferred area due to site limitations
and it is necessary to position the unit in the loft, or in a position above the
secondary tapping that feeds the pump, then there is an increased risk of air
locks. This risk must be eliminated.
The following method will help to overcome the problem:
In this application only use an Essex or side entry flange, then fit a “U” bend or
downward loop in the supply pipe to the pump of 350 mm depth before rising to
the pump should ensure the cylinder vents its air up the expansion pipe, not up
the pump feed (Fig. 7).
Max. inlet head
10
m
Min. inlet head
1
m
350
mm
min.
Least preferred area
Fig. 7