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Self-Priming centrifugal pumps were invented in 1935. One of the first companies to market a self-priming centrifugal pump was American Marsh in 1938. [citation needed] Centrifugal pumps that are not designed with an internal or external self-priming stage can only start to pump the fluid after the pump has initially been primed with the fluid.
Different types of pumps are suitable for different applications, for example: a pump's maximum lift height also determines the applications it can be used for. Low-lift pumps are only suitable for the pumping of surface water (e.g., irrigation, drainage of lands, ...), while high-lift pumps allow deep water pumping (e.g., potable water pumping ...
While centrifugal pumps impart momentum to the fluid by motion of blades, positive displacement pumps transfer fluid by variation in the size of the pump’s chamber. Centrifugal pumps can be of rotor or propeller types, whereas positive displacement pumps may be gear-based, piston-based, diaphragm-based, etc. As a general rule, centrifugal ...
Sifeng Model 12 HP 2WT with 5.6 tonnes of rice, Bangladesh A Changzhou Hengfeng Two-wheel tractor ('Walking Tractor') in Hsipaw ().. Research has identified several terms used to identify the two-wheel tractor including: "walk-behind tractor, iron-ox, walking tractor, mechanical ox, ox-machine, pedestrian tractor, hand tractor, single-axle tractor, and in Asia, tok-tok".
In these rotary implements, the affinity laws apply both to centrifugal and axial flows. The laws are derived using the Buckingham π theorem. The affinity laws are useful as they allow the prediction of the head discharge characteristic of a pump or fan from a known characteristic measured at a different speed or impeller diameter.
This is a list of notable manufacturing companies of Bangladesh This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources .
In June 2021, a Turkey 105 mm and 155 mm artillery shell production line establishment agreement was signed between Bangladesh and Turkish company REPKON. With the modern Free Flowforming (REPKON patented) technology and computerized machinery from REPKON, BOF will produce high-quality 105 mm and 155 mm artillery shells.
Victory Day celebration by PetroBangla. Petrobangla was founded in 1985 (Notification of Ordinance-21 in April 11 1985) by merging two government organizations Bangladesh Oil & Gas Corporation (BOGC) and Bangladesh Mineral Exploration and Development Corporation (BMEDC) into Bangladesh Oil, Gas and Mineral Corporation(BOGMC). [3]