![]() Some tank designs incorporate a diaphragm or bladder to isolate the expanded water from the pressure controlling air cushion. The expansion tank uses compressed air to maintain system pressures by accepting and expelling the changing volume of water as it heats and cools. A properly sized tank will accommodate the expansion of the system fluid during the heating or cooling cycle without allowing the system to exceed critical pressure limits. What are Expansion Tanks?Įxpansion tanks are required in a closed loop heating or chilled water HVAC system to absorb the expanding fluid and limit the pressure within a heating or cooling system. Custom tanks are produced to customer specifications, for high pressures and/or special materials for severe duty applications. The majority of Wessels products are standard catalog models, with over 6,000 tanks in inventory for quick shipment. ![]() Most of Wessels pressure vessels are designed using a pre-pressurized vessel with an internal bladder or diaphragm to manage fluids under pressure. ![]() Tanks range in size from 2 to 10,000 gallons. Each tank style has models that are either ASME or Non-ASME coded. Wessels manufactures three expansion tank designs: Compression, Bladder and Diaphragm. ![]()
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