ASME-certified expansion tanks for commercial, high-rise residential, and industrial applications.
Steelcraft distributes bladder-style expansion tanks and designs and manufactures its own line of custom plain steel expansion tanks. Expansion tanks come in a variety of diameters, lengths, and pressure ratings, and are available in both horizontal and vertical configurations.
Please click here for our bladder-style expansion tank selection guide for condominium, high-rise, or mixed-use development project applications.
Bladder-Style Expansion Tanks
Custom Plain Steel Expansion Tanks
Carbon Steel, Stainless Steel
Steelcraft’s expansion tanks are designed and constructed to ASME Section VIII, Division 1.
Expansion tanks should always be installed in accordance with the authority having jurisdiction (AHJ).
With plain steel expansion tanks, water and air are both present in a single cavity and the system is pressurized to its minimum operating pressure. When water from the adjacent system heats up and expands, it enters the plain steel expansion tank, mixes with the existing water in the tank, and increases the air pressure within the tank. When the water from the adjacent system cools down and contracts, the additional air pressure within the tank pushes the extra water volume out of the expansion tank and back into the primary system.
Bladder-style expansion tanks fulfill the same function as plain steel expansion tanks but operate differently. Instead of having water and air together in one cavity, bladder-style expansion tanks are designed such that additional water from the system is stored in a heavy-duty butyl bladder without the presence of air. When water from the adjacent system heats up and expands, it enters the bladder, which is surrounded by an interstitial space containing pressurized air. When the water from the adjacent system cools down and contracts, the pressurized air surrounding the bladder squeezes the bladder and forces the water back into the primary system.