Reference Data
In the following pages we have compiled technical information on our range of products. Data has been gathered from manufacturers’
most recent published specifi cations and, when this has not been available, from our own research. While we make every effort to ensure
that the information is accurate, mistakes can occur and we cannot be held responsible for consequential loss suffered as a result of
errors, omissions or approximations. We are also constantly improving and updating our products and, as a result, reserve the right to alter
specifi cations without notice. This data should be used as a guide only and, if your application requires more specifi c information, then we
strongly recommend that you ask our Sales Department to provide written confi rmation.
Below we give an explanation of the terms used in the main body of the catalogue:
1) PUMP OPERATION
“M” or “manual”: a fl oat switch is not fi tted. The pump will require an operator to control the water level by switching the pump on or off at
the mains, because it will operate immediately when power is applied. Some pumps must not be run dry, so care should be taken not to
operate them without water, unless we have stated that it is possible to do so.
“A” or “auto”: a fl oat switch is fi tted. The pump will turn itself on and off automatically with a rise and fall of the water level, so the presence
of an operator is not required. When power is connected, the pump will only operate when the fl oat switch is actuated, which generally
occurs at or about the point when the top of the pump casing is submerged. The fl oat normally stops the pump when the water level is still
covering the impeller, so it is normal for residual water to remain in the sump. The volume of this water can be minimised by fi tting a non-
return valve in the discharge pipe near the pump, to prevent back fl ow into the sump. It is vital to ensure that no protrusions, pipes, wiring,
debris etc. can obstruct the fl oat switch movement. Failure of the fl oat to move freely could damage the pump due to dry running, and/
or cause fl ooding. Pendant fl oat switches can only be adjusted slightly, and should not be moved so much that the pump will not start or
stop. If you do adjust it, check the pump operates correctly before relying on the installation i.e. feed water into the chamber/sump slowly;
witness it starting and stopping and adjust if necessary. Turning the fl oat up and down by hand is not suffi cient.
When selecting an automatic pump for an application, it is essential that the dimensions and volume of the sump allow full and free
movement of the fl oat. Too small a sump can lead to rapid on/off operating cycles, whereas a larger sump will reduce the number of
starts the pump will make and, in turn, increase its life. Most motor manufacturers suggest no more than 25 starts per hour. Many outside
infl uences can alter the point at which an automatic pump starts or stops operating. An example of this would be a build up of grease or
fat on the pump, the fl oat, or the walls of the chamber. Therefore we strongly recommend that all installations are inspected regularly to
check operation.
2) PUMP CONNECTIONS
When the fi gure is given in an imperial measurement (e.g. 1¼”) then the inlet and/or outlet is threaded. A hose tail would be necessary if
fi tting to a fl exible pipe is required.
When the fi gure is given in a metric measurement (e.g. 32mm) then the inlet and/or outlet is supplied with a hose tail to enable fi tting to
a fl exible pipe.
“outlet”: this is the internal diameter size of the discharge pipe required to suit the pump outlet port. Outlet pipe sizes can be reduced, e.g.
to match existing pipe-work, however, due to increased friction losses, pumping capacity will be reduced, and power consumption may
be affected. On solids handling pumps particularly, the risk of blockage is also increased. Outlet pipe size can be increased to improve fl ow
over long pipe runs, but must not be of such a diameter that the pump is caused to operate below its minimum head. Please consult our
Sales Department for advice if you wish to operate a pump with a discharge pipe diameter different to that published.
“inlet”: this is the internal diameter size of the inlet pipe required to suit the pump inlet. Reducing this size is not recommended as cavitation
or erratic operation of the pump could result, leading to greatly reduced pump life. In some instances, e.g. suction lift duty on oils, it may
actually be necessary to increase the bore of the suction pipe from that specifi ed. Inlet pipe or suction hose must have a suffi ciently rigid
construction and temperature range to avoid collapsing during pump operation.
Submersible sewage pumps models are supplied in two versions:
“free-standing version”: this includes feet or a support stand, and a mating fl anged elbow with a female BSP outlet fl ange
to suit a hose tail or pipework.
“fi xed-guide rail version”: this includes the components required for guide rail mounting, but excludes the guide rails.
3) MOTORS
“kW”: our published motor power ratings are “output” powers, but the power drawn from the mains (“input”) will always exceed this
fi gure. As a guide, the percentage difference between output and input is greater on the lowest powered motors. An input fi gure should
be used for calculating running costs and will vary depending on the application.
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