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Pump tanks are known by many names: pressure tanks, pressurized tanks, hydropneumatic tanks, etc. They are used to build and "save" pressure for later use.
Normally, a pressure switch is used to activate the pump when water pressure reaches a minimum setting. The pump puts water in the pressure tank until it is deactivated when the water pressure reaches a maximum setting. Common settings are 20 to 40 psi or 30 to 50 psi.
Conventional tanks (galvanized iron or stainless steel tanks without membrane) are traditionally used as pump tanks. No membrane separates water and air and tank. This design suffers from regular loss of air as air is dissolved in the water over time, leading to water logging. Air must be regularly recharged to prevent water logging and damaging your pump. Because there is no membrane, the water tank size is also unnecessarily large to provide volume for both air and water. Durability of G.I. tanks suffers further from rusting.
Pump tanks with membranes (also known as bladder tank, membrane tank, or diaphragm tank) do not suffer from the above design issues. Because a membrane separates air from water, rusting and vacuum is eliminated. These tanks also save a lot of space, providing the same amount of water as larger conventional tanks, while occupying less space.
Applications: Water systems for residential and commercial use