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Bladder tanks were initially used for rapid deployment by DODs, UN, Ngos in the case of war or disaster and later for more long term applications in a wide range of industries such as farming, mining, manufacturing, marine and aviation. Bladder tanks have many capacities ranging from 500 liter up to 1 million liters.
The diaphragm or bladder may itself exert a pressure on the water, but it is usually small and will be neglected in the following discussion. Case 1 is an empty tank at the charging pressure P c (gauge). The total volume of the tank is V t. Case 2 is a tank in use, with the air pressure at pressure P (gauge) and a water volume of V
An expansion tank or expansion vessel is a small tank used to protect closed water heating systems and domestic hot water systems from excessive pressure. The tank is partially filled with air, whose compressibility cushions shock caused by water hammer [ citation needed ] and absorbs excess water pressure caused by thermal expansion .
Air vessels such as expansion tanks and some types of hydraulic accumulators work in much the same way as water towers, but are pressurized. They typically have an air cushion above the fluid level in the vessel, which may be regulated or separated by a bladder. Sizes of air vessels may be up to hundreds of cubic meters on large pipelines.
If the accumulator is not of the piston type care must be taken that the bladder or membrane will not be damaged in any expected over-pressure situation, many bladder-type accumulators cannot tolerate the bladder being crushed under pressure. A compressed gas accumulator was invented by Jean Mercier [5] for use in variable-pitch propellers.
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3579 S High St, Columbus, OH · Directions · (614) 409-0683