EXPANSION TANKS
Expansion tanks are pressure vessels designed to accommodate fluid expansion in closed heating or cooling systems. When liquid (like water) is heated, it expands; the expansion tank absorbs this excess volume, maintaining system pressure and preventing damage to pipes, valves, and appliances.
Fabrimech Engineers Pvt. Ltd. manufactures expansion tanks for closed-loop heating, cooling and thermal management systems. Our expansion tanks are available in mild steel, carbon steel and stainless steel grades such as SS 304 and SS 316, with customized capacities, orientations, pressure ratings, fittings and insulation options based on system requirements.
Product Specifications
| Specification | Details |
|---|---|
| Material Grades | Mild Steel, Carbon Steel, Stainless Steel (SS 304 / SS 316) – other grades on request |
| Capacity Range | From 5 Litres up to several thousand litres depending on system size |
| Orientation | Vertical or Horizontal installation |
| Pressure Rating | Up to 10 bar (higher on request) |
| Operating Temperature | −20 °C to +200 °C (depends on material) |
| Wall Thickness | Varies with capacity, pressure, material – typically between 3 mm to 12 mm |
| Surface Finish | Primer-coated (for steel), epoxy lining, or polished / painted finish as required |
| Insulation Option | Optional insulation jackets (PUF, Rockwool) for thermal protection |
| Accessories & Fittings | Pressure relief valve, air vent, diaphragm or bladder insert, drain connection, mounting feet/brackets |
| Testing | Hydrostatic / pneumatic testing for leak proof assurance; certification per relevant standards |
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Key Features
- Pressure Stabilisation: Maintains steady pressure in closed loop systems to prevent overpressure and steam hammer.
- Thermal Expansion Management: Accommodates expansion of fluid during heating cycles, thereby protecting system components.
- Corrosion & Durability Options: With material choices and internal linings to resist corrosion and extend service life.
- Flexibility & Customization: Sizes, shapes, mounting options, accessories, and fittings tailored to the project.
- Leak-Tight Design: Welded seams, proper seals, and stringent quality control ensure minimal risk of leaks.
Applications
Residential & Commercial Heating (Boilers, Radiators)
Expansion tanks absorb pressure from heated water in boilers and radiators, protecting pipes and extending the life of heating systems in homes, offices, and buildings.
Solar Thermal Systems
In solar hot water systems, expansion tanks manage fluid expansion caused by high temperatures, ensuring safe, efficient operation of collectors and pipelines.
Hot Water & Chilled Water Systems
They balance pressure in hot and chilled water loops, preventing water hammer and keeping circulation pumps and valves working efficiently.
HVAC Systems
Expansion tanks stabilize pressure in HVAC circuits, improving comfort, reducing stress on equipment, and ensuring smooth heating and cooling performance.
Additional Features
- Agitator/Mixer Option: For blending liquids in food, pharma, and chemical processes
- Jacketed Tanks: For heating or cooling applications using steam, hot water, or chilled water
- CIP (Clean-in-Place) System: Easy cleaning without dismantling the tank
- Custom Nozzles & Fittings: Inlets, outlets, sampling valves, and drain connections
- Mobility Options: Fixed installation or mobile with wheels
Frequently Asked Questions About Expansion Tanks
What is an expansion tank?
An expansion tank is a pressure vessel designed to accommodate the increase in fluid volume caused by thermal expansion in a closed heating or cooling system. It helps maintain stable system pressure and protects pipes, valves and other components.
What are expansion tanks used for?
Expansion tanks are used in closed-loop heating and cooling systems, including boilers, HVAC systems, solar thermal systems, hot water systems and chilled water systems. They absorb fluid expansion and help prevent excessive pressure buildup.
What materials are used to manufacture expansion tanks?
Fabrimech manufactures expansion tanks using mild steel, carbon steel and stainless steel, including SS 304 and SS 316. Other material grades can be considered based on project requirements.
What capacity expansion tanks does Fabrimech manufacture?
Fabrimech manufactures expansion tanks from approximately 5 litres to several thousand litres, depending on the system size and application requirements.
Can expansion tanks be customized?
Yes. Expansion tanks can be customized according to required capacity, orientation, pressure rating, material, wall thickness, fittings, mounting arrangements, insulation and surface finish.
What pressure can an expansion tank handle?
The current product specifications list pressure ratings up to 10 bar, with higher pressure requirements available on request depending on the design and application.
What industries and systems use expansion tanks?
Expansion tanks are used in residential and commercial heating, HVAC systems, solar thermal systems, hot water systems and chilled water systems. They can also be adapted for other industrial thermal-management applications.
How are expansion tanks tested?
Fabrimech’s specifications include hydrostatic and pneumatic testing for leak-tightness, with certification according to relevant standards where applicable.
Advantages
- Prevents system damage caused by thermal expansion (burst pipes, valves failing)
- Improves lifespan of system components (boiler, pumps, piping)
- Helps maintain consistent pressure and comfort (in heating/cooling)
- Energy savings by reducing stress on pumps / system due to smoother operation
- Customizable to match your building, climate, capacity needs
