Expansion Tanks

ASME-certified expansion tanks for commercial, high-rise residential, and industrial applications.



Expansion Tank, Steelcraft Inc., Provider of Steel Products and OEM Manufacturing in Ontario

Expansion Tanks

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.  

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Product Information

Steelcraft supplies a wide variety of bladder-style expansion tanks for condominium, high-rise, or mixed-use development project applications. 

Please click here for our bladder-style expansion tank selection guide.

Please click here for our bladder-style expansion tank installation, operation, and maintenance (IOM) guide.

Please click here for our cross-reference guide comparing volume requirements of plain steel vs. bladder-style expansion tanks.

Buffer Tanks, Chilled Water (ASME) - FCBT-Series

Drawings for ASME-rated FCBT-series chilled water buffer tanks can be found here (450-3930 L).

Hydronic Expansion Tanks (ASME) - FNTA-Series (Non-Potable Water Service, Non-Replaceable Bladder)

Drawings for ASME-rated FNTA-series bladder-style expansion tanks can be found here (30-800 L).

Hydronic Expansion Tanks (ASME) - FNLA-Series (Non-Potable Water Service, Replaceable Bladder)

Drawings for ASME-rated FNLA-series bladder-style expansion tanks can be found here (35–4000 L).

Hydropneumatic Expansion Tanks (ASME) - FFXA-Series (Potable Water Service, Replaceable Bladder)

Drawings for ASME-rated FFXA-series bladder-style expansion tanks can be found here (85–2000 L).

Hydropneumatic Expansion Tanks (NON-ASME) - FFX-NC-Series (Potable Water Service, Replaceable Bladder)

Drawings for NON-ASME FFX-NC-series bladder-style expansion tanks can be found here (8–2000 L).

Thermal Expansion Tanks (ASME) - FTTA-Series (Potable Water Service, Non-Replaceable Bladder)

Drawings for ASME-rated FTTA-series bladder-style expansion tanks can be found here (13-340 L).

Thermal Expansion Tanks (ASME) - FTXA-Series (Potable Water Service, Replaceable Bladder)

Drawings for ASME-rated FTXA-series bladder-style expansion tanks can be found here (35–2500 L).

Steelcraft supplies the tanks below for custom applications.

ORIENTATION DIAMETER LENGTH/HEIGHT RANGE CAPACITY RANGE DRAWINGS
Horizontal 30" 48" - 108" 482 L - 1155 L Download Drawing
Horizontal 36" 60" - 120" 868 L - 1841 L Download Drawing
Horizontal 42" 60" - 144" 1168 L - 3032 L Download Drawing
Horizontal 48" 60" - 168" 1496 L - 4628 L Download Drawing
Horizontal 54" 72" - 180" 2291 L - 6250 L Download Drawing
Horizontal 60" 72" - 204" 2796 L - 8783 L Download Drawing
Vertical 30" 48" - 108" 482 L - 1155 L Download Drawing
Vertical 36" 60" - 120" 868 L - 1841 L Download Drawing
Vertical 42" 60" - 144" 1168 L - 3032 L Download Drawing
Vertical 48" 60" - 168" 1496 L - 4628 L Download Drawing
Vertical 54" 72" - 180" 2291 L - 6250 L Download Drawing
Vertical 60" 72" - 204" 2796 L - 8783 L Download Drawing

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).

  • Question 1: What is the difference between plain steel and bladder-style expansion tanks?

    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.

  • Question 2: Does Steelcraft offer air receiver tanks?

    Yes, Steelcraft designs and manufactures air receiver tanks.  The standard dimensions and layouts shown under the "Custom Expansion Tanks" tab provide the baseline for our air receiver tank selections.

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