A suction cleaning device may also be connected via specialised fittings on the pool wall, although it may be connected to a dedicated pump. Back washing the pool system is achieved by switching valves to reverse the flow of the water in order to clean the filter and eject built-up debris.
There are numerous variables and configurations of pool hydraulic systems, which can effect the energy consumption of the pool pump. These include:
- Filter type.
- Pipework material, internal diameter, length and number of elbows.
- Type and number of pool fittings.
- Presence of pool heater, chlorinator and suction cleaning device.
- Pool size.
- Pump operating regime, including frequency of backwashing (to clean filter and thereby reduce pump head).
- Pump efficiency.
The pool pump-unit consists of an electric motor attached to a mechanical pump, which incorporates an impeller rotating inside the pump housing (see Figure 1). The efficiency of the pump reflects the efficiency of both the motor and the pump. The motor’s efficiency is a measure of how well it converts electrical energy into mechanical energy. The pump’s efficiency is a measure of how well it converts mechanical energy into hydraulic energy. The hydraulic energy produced by a pump-unit serving a pool system must overcome the system’s resistance-to-flow (expressed in metres of head) to create adequate flow (expressed in litres per minute).
Figure 1 – typical pool pump unit
|Types of Pool Pumps|
|Single Speed Pumps||These pumps are typically made with an induction style electric motor and are capable of only a single speed.|
|Dual Speed||These pumps are typically made with an induction style electric motor and are capable of only two speeds.|
|Multiple Speed||Generally, these pumps are made with an induction style electric motor but are capable of a number of fixed speeds. During installation, the installer will set the pump to a preferred speed often taking into consideration the recommended speed in the manufacturers brochure.|
|Variable Speed||These pumps are generally made with permanent electric magnet motors allowing them capability to operate at any number of speeds within their range. This capability is provided through the attachment of a variable speed drive controller and allows the pump owner to customise the programming of speed and flow for different applications of use.|
Also, remember it’s always a good idea to use qualified pump installer to obtain your piece of mind. You are encouraged to compare products that are labelled under the voluntary program as they provide clear information about their energy performance.
Submersible pumps can operate while completely submerged underwater. These pumps are fully sealed to prevent water from entering the motor, with their main use being to transfer water, usually from an underground source, like a borehole or well, to a more desired location.
If you enjoy a natural source of water on your property, consider yourself lucky. This is a huge benefit to you and can be a real cost-saver especially during the drier, hotter months when you use far more water. You will however need a submersible pump to allow you to efficiently pump water from your underground source.
Whether you are a residential home owner or a commercial farmer, we have a bore pump to suit your needs. Bore water pumps will allow you to retrieve your underground water and transfer it to a large container that makes it easy for you to access.
The advantage of a submersible bore pump is that you can place it in the water itself, as they are completely water proof, and fully functional when submerged. Another benefit is that they are placed completely out of the way and are almost silent, without being any less effective. Made from stainless steel they are hardy, won’t rust and can work under high water pressure.
Submersibles can work with any underground water source as well as your garden fish pond and swimming pool. They are also effective with drain clearing and sewer systems. They are usually placed in the lowest part of your home, helping to prevent moisture build-up and prevent flooding. All our pumps are of high quality, come with a guarantee and are reliable and durable. They are also easy to maintain, repair and clean, meaning if you look after them properly they will last you for many years.
When it comes to your sewage system, no one wants to go down there, and by employing a submersible pump, you or your plumber can manage the effective removal of your household or commercial sewage. This is both more efficient and hygienic.
These pumps can cope effectively with blockages and are more likely to prevent issues that are not easy to solve. We have a range of these pumps, some designed for residential and some for commercial use.
We have many year experience in the field and have all the knowledge and equipment to sufficiently service the needs of our clients. From repairs to new units to motors and wet end.
Booster pumps are usually piston or plunger type compressors. A single-acting, single-stage booster is the simplest configuration, and comprises a cylinder, designed to withstand the operating pressures, with a piston which is driven back and forth inside the cylinder. The cylinder head is fitted with supply and discharge ports, to which the supply and discharge hoses or pipes are connected, with a non-return valve on each, constraining flow in one direction from supply to discharge. When the booster is inactive, and the piston is stationary, gas will flow from the inlet hose, through the inlet valve into the space between the cylinder head and the piston. If the pressure in the outlet hose is lower, it will then flow out and to whatever the outlet hose is connected to. This flow will stop when the pressure is equalised, taking valve opening pressures into account.
Once the flow has stopped, the booster is started, and as the piston withdraws along the cylinder, increasing the volume between the cylinder head and the piston crown, the pressure in the cylinder will drop, and gas will flow in from the inlet port. On the return cycle, the piston moves toward the cylinder head, decreasing the volume of the space and compressing the gas until the pressure is sufficient to overcome the pressure in the outlet line and the opening pressure of the outlet valve. At that point, the gas will flow out of the cylinder via the outlet valve and port.
There will always be some compressed gas remaining in the cylinder and cylinder head spaces at the top of the stroke. The gas in this “dead space” will expand during the next induction stroke, and only after it has dropped below the supply gas pressure, more supply gas will flow into the cylinder. The ratio of the volume of the cylinder space with the piston fully withdrawn, to the dead space, is the “compression ratio” of the booster, also termed “boost ratio” in this context. Efficiency of the booster is related to the compression ratio, and gas will only be transferred while the pressure ratio between supply and discharge gas is less than the boost ratio, and delivery rate will drop as the inlet to delivery pressure ratio increases.
Delivery rate starts at very close to swept volume when there is no pressure difference, and drops steadily until there is no effective transfer when the pressure ratio reaches the maximum boost ratio.
Compression of gas will cause a rise in temperature. The heat is mostly carried out by the compressed gas, but the booster components will also be heated by contact with the hot gas. Some boosters are cooled by water jackets or external fins to increase convectional cooling by the ambient air, but smaller models may have no special cooling facilities at all. Cooling arrangements will improve efficiency, but will cost more to manufacture.
Boosters to be used with oxygen must be made from oxygen-compatible materials, and use oxygen-compatible lubricants to avoid fire.
Small-scale sewage pumping is normally done by a submersible pump.
This became popular in the early 1960s, when a guide-rail system was developed to lift the submersible pump out of the pump station for repair, and ended the dirty and sometimes dangerous task of sending people into the sewage or wet pit. Growth of the submersible pump for sewage pumping since has been dramatic, as an increasing number of specifiers and developers learned of their advantages.
Three classes of submersible pumps exist:
- Smaller submersible pumps, used in domestic and light commercial applications, normally handle up to 55 millimetres (2.2 in) spherical solids and range from 0.75 to 2.2 kilowatts (1.01 to 2.95 hp).
- Larger submersible pumps, handle 65 millimetres (2.6 in) and larger solids and normally have a minimum of 80 millimetres (3.1 in) discharge. They are generally used in municipal and industrial applications for pumping sewage and all types of industrial waste water.
- Submersible chopper pumps, which are used to handle larger concentrations of solids and/or tougher solids that conventional sewage pumps cannot handle. Chopper pumps are generally used in municipal and industrial waste water applications and provide clog-free operation by macerating those solids that might clog other types of submersible pumps.
Submersible pumps are normally used in a packaged pump station where drainage by gravity is not possible.
Vertical type sewage pumps have also been used for many years. They have the motor above the floor so work on the motor can be done without entering the sewage pit.
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