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Accumulator Navigation menu Video02 Use of Hydraulic Accumulator
Compressed gas accumulators, also called hydro-pneumatic accumulators, are by far the most common type. The first accumulators for Armstrong 's hydraulic dock machinery were simple raised water towers.
Water was pumped to a tank at the top of these towers by steam pumps. When dock machinery required hydraulic power, the hydrostatic head of the water's height above ground provided the necessary pressure.
These simple accumulators were extremely tall. Because of their size, they were costly, and so were constructed for less than a decade. Around the same time, John Fowler was working on the construction of the ferry quay at nearby New Holland but could not use similar hydraulic power as the poor ground conditions did not permit a tall accumulator tower to be built.
By the time Grimsby was opened, it was already obsolete as Armstrong had developed the more complex, but much smaller, weighted accumulator for use at New Holland.
Another surviving tower is adjacent to East Float in Birkenhead , England. A raised weight accumulator consists of a vertical cylinder containing fluid connected to the hydraulic line.
The cylinder is closed by a piston on which a series of weights are placed that exert a downward force on the piston and thereby pressurizes the fluid in the cylinder.
In contrast to compressed gas and spring accumulators, this type delivers a nearly constant pressure, regardless of the volume of fluid in the cylinder, until it is empty.
The pressure will decline somewhat as the cylinder is emptied due to the decline in weight of the remaining fluid. A working example of this type of accumulator may be found at the hydraulic engine house, Bristol Harbour.
The water is pumped from the harbour into a header tank and then fed by gravity to the pumps. The working pressure is psi 5. The original operating mechanism of Tower Bridge , London , also used this type of accumulator.
Although no longer in use, two of the six accumulators may still be seen in situ in the bridge's museum. Regent's Canal Dock, now named Limehouse Basin has the remains of a hydraulic accumulator, dating from , a fragment of the oldest remaining such facility in the world, the second at the dock, which was installed later than that at Poplar Dock , originally listed incorrectly as a signalbox for the London and Blackwall Railway , when correctly identified, it was restored as a tourist attraction by the now defunct London Docklands Development Corporation.
London had an extensive public hydraulic power system from the mid-nineteenth century finally closing in the s with 5 hydraulic power stations, operated by the London Hydraulic Power Company.
Railway goods yards and docks often had their own separate system. A simple form of accumulator is an enclosed volume, filled with air.
The basic idea of an accumulator contract is that the buyer speculates a company will trade between a certain price range the range between the strike and the knock out price within the contract period, and the issuer bets that stock will fall below the strike price.
Note that the buyer holds an obligation to buy the shares at the strike price and not the option to buy.
Likewise, the issuer holds an obligation to sell shares at the strike price. Terms of the accumulator contract between two counterparties are specified in a term sheet.
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