4) PUMPING PERFORMANCE
“fl ow”: published fl ows are given in litres per minute and are based on pumping clean, cold water (or diesel, or oil, when referring to fuel and
lubricant pumps), through the outlet bore specifi ed. This fi gure is the maximum the pump can deliver at the minimum head recommended.
Flow will decrease with an increase in head created by adding pipe vertically (physical head), and/or horizontally (head due to friction losses
in pipe run)
“head”: published heads are given in metres and are based on pumping clean, cold water (or diesel, or oil, when referring to fuel and
lubricant pumps), through the outlet bore specifi ed. The fi gure is the maximum height of a vertical column of water that the pump could
support if there were no other losses in the system. For submersibles, head is the distance from the water level to the highest point in the
pipeline. For surface mounted pumps operating with a fl ooded suction, it is the distance from the pump’s centre line to the highest point in
the pipeline. For surface pumps operating with a suction lift, the total head is again the distance from the water level to the highest point in
the pipeline. In practice total head is not simply a height difference between suction and delivery points, because the friction losses created
by horizontal pipe-work, valves, elbows, etc., and the specifi c gravity and viscosity of the liquid need to be added. This means that, in
systems with long pipe runs and many fi ttings, pump output may be greatly reduced.
“suction lift”: published lifts are given in metres and are based on pumping clean, cold water(or diesel, or oil, when referring to fuel and
lubricant pumps), through the inlet bore specifi ed. A “suction lift” is the distance from the pump’s centre line to the water level. There are
few limitations on the discharge side of a pump or pumping system, however there are very defi nite limitations to the suction side. This
is why we suggest that submersible pumps should always be chosen in preference to surface mounted pumps, whenever possible.
The theoretical maximum lift for clean, cold water is approximately 10 metres; however in practical terms it is considerably lower and we
recommend 6 metres or less of inlet pipe. For fuel transfer pumps the maximum is even lower and 3 metres or less is recommended. For oil
transfer pumps it is 2 metres or less. In all cases the additional the losses created by horizontal pipe-work, valves, elbows, specifi c gravity
and viscosity of the liquid need to be added.
Performance Curves: these indicate the output possible at measured points. Care should be taken not to select a pump for operation off
the bottom or the top of the curve, as this could lead to premature pump failure. Ideally the pump should operate within the middle third of
the curve to achieve maximum effi ciency. Published fl ows are given in litres per minute at a head point in metres, and are based on pumping
clean, cold water(or diesel, or oil, when referring to fuel and lubricant pumps), through the outlet bore specifi ed. From the preceding notes
it should be obvious that all aspects of the system must be taken into account when making a pump selection. Please consult our Sales
Department for advice and guidance when using these curves.
5) DIMENSIONS & WEIGHTS
“w x l x h” (width x length x height) or “diam x h”(diameter x height): the fi gures published are either taken from the manufacturers’
latest specifi cations or, when these are not available, from our own measurements. If your application requires precise information we
strongly recommend that you request written confi rmation from our Sales Department.
Submersibles: the width dimension excludes the hose coupling (when supplied). The height is measured to the top of the handle, lifting-
eye or outlet, which ever is greater.
Surface pumps: the height and length, in most cases, excludes the handle, hose couplings and any hose kit.
Engine pumps: for centrifugal pumps this is the outside dimension of the frame or base plate (WX10). For the diaphragm pumps, the
dimensions include the chassis, wheels, prop stands and handles.
Hand pumps: dimensions exclude the length of the removable lever on the DD and SD45 pumps. It is inclusive of the integral lever on
the SD60. Where a foot-plate is fi tted, the dimensions include this size. For the rotary pumps, the outlet and riser pipes dimensions are
included. Hoses and hose kits are not included in any dimension.
“weight”: the fi gures published are approximate and either taken from the manufacture’s latest specifi cations or, when these are not
available, from our own measured weight. This data should be used as a guide only and, if your application requires specifi c information,
then we strongly recommend that you ask our Sales Department to provide written confi rmation.
The weight given is the dry weight of the product i.e. it excludes the power cable. Where applicable, it excludes any hose kit. For
Tsurumi free-standing sewage pumps it includes the fl anged elbow.
6) SOLIDS HANDLING
“free passage”: this is the size of the solids that the manufacturer specifi es that the pump can pass.
7) ENGINES
Petrol driven pumps are fi tted with Honda engines and run on unleaded fuel.
“oil alert”: this is a protection device for petrol engines that will stop the engine during operation or prevent the engine starting, if there is
insuffi cient oil in the sump.
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