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Pumping station
From Wikipedia, the free encyclopedia
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It has been suggested that Packaged pump station be merged into this article or section. (Discuss) |
Pumping stations are facilities including pumps and equipment for pumping fluids from one place to another. They are used for a variety of infrastructure systems that many people take for granted, such as the supply of water to canals, the drainage of low-lying land, and the removal of sewage to processing sites.
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A pumping station is, by definition, an integral part of a Pumped-storage hydroelectricity installation.
In countries with canal systems, pumping stations are also frequent. Because of the way the system of canal locks work, water is lost from the upper part of a canal each time a vessel passes through. Also, most lock gates are not watertight, so some water leaks from the higher levels of the canal to those lower down. Obviously, the water has to be replaced or eventually the upper levels of the canal would not hold enough water to be navigable.
Canals are usually fed by diverting water from streams and rivers into the upper parts of the canal, but if no suitable source is available, a pumping station can be used to maintain the water level. An excellent example of a canal pumping station is the Claverton Pumping Station on the Kennet and Avon Canal in southern England. This pumps water from the nearby River Avon to the canal using pumps driven by the power of the river itself.
Where no external water supply is available, back pumping systems may be employed. Water is extracted from the canal below the lowest lock of a flight and is pumped back to the top of the flight, ready for the next boat to pass through. Such installations are usually very small.
When low lying areas of land are drained, the general method is to dig drainage ditches. However, if the area is below sea level then it is necessary to pump the water upwards into water channels that finally drain into the sea.
The Victorians understood this concept, and in the United Kingdom they built pumping stations with large water pumps, powered by large steam engines to accomplish this task. In Lincolnshire, large areas of wetland at sea level, called The Fens, were turned into rich arable farmland by this method. The land is full of nutrients because of the accumulation of sedimentary mud that created the land initially.
Elsewhere, pumping stations are used to remove water that has found its way into low-lying areas as a result of leakage or flooding (in New Orleans, for example).
Pumping stations in sewage collection systems are normally designed to handle raw sewage that is fed from underground gravity pipelines (pipes that are laid at an angle so that a liquid can flow in one direction under gravity). Sewage is fed into and stored in an underground pit, commonly known as a wet well. The well is equipped with electrical instrumentation to detect the level of sewage present. When the sewage level rises to a predetermined point, a pump will be started to lift the sewage upward through a pressurized pipe system called a sewer force main from where the sewage is discharged into a gravity manhole. From here the cycle starts all over again until the sewage reaches its point of destination – usually a treatment plant. By this method, pumping stations are used to move waste to higher elevations. In the case of high sewage flows into the well (for example during peak flow periods and wet weather) additional pumps will be used. If this is insufficient, or in the case of failure of the pumping station, a backup in the sewer system can occur, leading to a sanitary sewer overflow – the discharge of raw sewage into the environment.
Sewage pumping stations are typically designed so that one pump or one set of pumps will handle normal peak flow conditions. Redundancy is built into the system so that in the event that any one pump is out of service, the remaining pump or pumps will handle the designed flow. The storage volume of the wet well between the 'pump on' and 'pump off' settings is designed to minimize pump starts and stops, but is not so long a detention time as to allow the sewage in the wet well to go septic.
The interior of a sewage pump station is a very dangerous place. Poisonous gases such as methane and hydrogen sulfide can accumulate in the wet well; an ill-equipped person entering the well would be overcome by fumes very quickly. Any entry into the wet well requires the correct confined space entry method for a hazardous environment. To minimize the need for entry, the facility is normally designed to allow pumps and other equipment to be removed from outside the wet well.
A pumped-storage scheme is a type of power station for storing and producing electricity to supply high peak demands by moving water between reservoirs at different elevations.
Typically, water is channelled from a high-level reservoir to a low-level reservoir, through turbine generators that generate electricity. This is done when the station is required to generate power. During low-demand periods, such as overnight, the generators are reversed to become pumps that move the water back up to the top reservoir.
- See also: List of pumped-storage plants
There are countless thousands of pumping stations throughout the world. The following is a list of those described in this encylopaedia.
In Great Britain, a considerable number of former pumping stations have been preserved and opened as museum attractions. The majority are, or were steam-powered, except as identified:
- Claverton Pumping Station, on the Kennet and Avon Canal, near Bath (water-powered)
- Cobb's Engine House, ruin near southern portal of Netherton Tunnel
- Crofton Pumping Station, on the Kennet and Avon Canal, near Great Bedwyn
- Leawood Pump House, on the Cromford Canal in Derbyshire
- Smethwick Engine, now removed from original site to Birmingham Thinktank
Used to pump water from a well into a reservoir
- Mill Meece Pumping Station, in Staffordshire
- Papplewick Pumping Station, Nottinghamshire (pumped from a 200ft deep well)
- Wapping Hydraulic Power Station, London (converted to electricity, now an arts centre and restaurant)
- Brunel Engine House, Rotherhithe, East London (extracted water from Thames Tunnel; original engine replaced (but no longer live steam))
- Prickwillow Engine House, near Ely, Cambridgeshire (now the Museum of Fenland Drainage)
- Stretham Old Engine, Stretham, Cambridgeshire
- Westonzoyland Pumping Station, Somerset
Used to pump drinking water from a reservoir into a water supply system.
- Blagdon Pumping Station, Chew Valley, Somerset
- Edgbaston Waterworks, Birmingham (probably not a 'museum' site)
- Kempton Park Pumping Station, London
- Kew Bridge Pumping Station, Kew Bridge, London
- Langford Pumping Station ("Museum of Power"), Essex
- Abbey Pumping Station, Leicester
- Abbey Mills Pumping Station, in North London. (steam engines no longer present)
- Claymills Pumping Station, near Burton upon Trent
- Coleham Pumping Station, Coleham, near Shrewsbury
- Crossness Pumping Station, in South London
- Low Hall Pumping Station, Walthamstow, North London
- Markfield Beam Engine, Tottenham, London
- Cruquius pumping station (Operational, but no longer steam-powered.)
- – an 8-beam Cornish engine with the largest cylinder (3.5m (144in) diameter) in the world.
- ir.D.F. Woudagemaal, (ir. Wouda pumping station) (world's largest steam-powered pumping station)
- Colne Valley Waterworks railway, Eastbury Pumping Station, near Watford
- Metropolitan Water Board Railway, Kempton Park, London
- List of narrow gauge railways at water treatment and sewage works in Great Britain