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Grundfos Potable Expansion Vessels

The Grundfos GT pressure tanks are long-life tanks ideally suited for controlling the pressure in domestic as
well as industrial applications in the following systems:

• cold-water (drinking-water) systems.
• heating systems.

The Grundfos GT expansion vessels available in sizes from 8 to 3000 litres suitable for vertical installation. GT tanks in sizes 24 to 80 litres are also suitable for horizontal installation.are long-life tanks ideally suited for controlling the pressure in domestic as well as industrial applications in the following systems: 

Typical applications:
• domestic water supply systems
• booster systems
• irrigation systems
• industrial systems.

Grundfos GT tanks ensure long, maintenance-free, reliable and controlled operation, tanks can be integrated in many different systems with a wide variety of pumps. The large number of tank sizes and types available makes it possible to select the pressure tank that best suits the application and system in question.

GT-U (bladder tank)
The pressure tank body is made of steel and is factory pre-charged with nitrogen. All parts in contact with water are either made of stainless steel or coated for protection against corrosion.
The replaceable bladder for tanks with a volume exceeding 60 litres is made of high-quality rubber material suitable for potable-water applications, such as booster systems, pressurisation and water hammer arresting.

GT-H (diaphragm tank)
The polypropylene liner combined with an FDA approved high-grade butyl diaphragm makes up the water chamber. This is held against the tank wall with a steel clench ring.
The brass air valve, sealed by a threaded O-ring valve cap, prevents air leaks.

GT-D (double-diaphragm tank)
The diaphragm is a chlorine-resistant 100 % butyl diaphragm with a precision-moulded copolymer polypropylene liner for superior air and water separation.
The diaphragm assembly is clenched together with a positive lock internal clench ring which contains drawdown water in a pre-charged air atmosphere, thus providing separation between the diaphragm and tank wall. This "air buffer" means less problems with condensation.
The air chamber is sealed with a fixed O-ring and closed cell foam.

GT-DF (double-diaphragm tank with FlowThru)
The FlowThru connection diverts system water into and more importantly out of the tank while the pump is running. This constant flushing ensures that the water in the tank remains fresh and eliminates the risk of stagnant water during normal system operation.

GT-C (composite tank)
The GT-C pressure tank is a lightweight pressure tank.
The diaphragm is a chlorine-resistant 100 % butyl diaphragm with a precision-moulded copolymer polypropylene liner for superior air and water separation. This design allows each tank size to have a properly sized water chamber matched to the drawdown performance of that tank.