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[30] [39] This is achieved by encasing the tank in a glass-topped box that allows heat from the sun to reach the water tank. [40] The other walls of the box are thermally insulated, reducing convection and radiation. [41] The box can also have a reflective surface on the inside. This reflects heat lost from the tank back towards the tank.
Since Seychelles' independence in 1976, per capita output in this Indian Ocean archipelago has expanded to roughly seven times the old near-subsistence level. Growth has been led by the tourist sector, which employs about 30% of the labor force and provides more than 70% of hard currency earnings, followed by tuna fishing .
An alternative effluent sewer which is similar to the STEG system is the STEP system. Because of the vast reduction of solid wastes and the capture of fats, oils and grease (FOG) within the interceptor tank, a pumping system can be used to move the wastewater under pressure rather than a gravity driven conveyance system.
A hand pump opens access to deeper groundwater that is often not polluted and also improves the safety of a well by protecting the water source from contaminated buckets. Pumps such as the Afridev pump are designed to be cheap to build and install, and easy to maintain with simple parts.
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Artificial lift is the use of artificial means to increase the flow of liquids, such as crude oil or water, from a production well. Generally this is achieved by the use of a mechanical device inside the well (known as pump or velocity string) or by decreasing the weight of the hydrostatic column by injecting gas into the liquid some distance down the well.
An enlargeable basic map of Seychelles An enlargeable satellite image of the island of Coetivy in the Seychelles Anse Lazio seen from north-east. Pronunciation: / s eɪ ˈ ʃ ɛ l z / ⓘ Common English country name: Seychelles; Official English country name: The Republic of Seychelles; Common endonym(s): Sesel, Seychelles; Official endonym(s):
The stuffing box prevents water from entering the boat's hull. In many small fiberglass boats, for example, the stuffing box is mounted inboard near the point the shaft exits the hull. The "box" is a cylindrical assembly, typically of bronze, comprising a sleeve threaded on one end to accept adjusting and locking nuts.