Pressuretank sizingcalculator

If you have questions about equipment size, water heaters or expansion tanks, you should talk to your manufacturing representative to ensure that you’re selecting the best equipment sized correctly for your application.

RO-MAN specialise in the manufacture of high quality water filtration systems, suitable for domestic, commercial and industrial application. Our years of industry-specific expertise means that we can help you choose a system that meets all your requirements.

How to calculateexpansion tanksize for chilled water system

Take some time to browse our range. If you’re not sure which kind of system or component you need, please contact a member of our highly knowledgeable team, who would be happy to offer advice and answer any questions you may have. Alternatively, our blog contains a wealth of specialist information and guidance that you can access at any time.

When you look a water heater in a large building or even a home, you may notice a much smaller tank close by. That small tank is a thermal expansion tank. An expansion tank in this application is a vessel design to accept additional system volume resulting from heating water. Water is incompressible and, when it is heated, it expands. If this happens in a system with a fixed volume of pipes and equipment, you will quickly discover the weakest point in the system as water begins to spray through it. (Hopefully, it is the pressure relief valve releasing water!)

We are proponents of sustainable and efficient hydronic heating and cooling building solutions, which are at the heart of commercial green building.

Expansion tank sizingrule of thumb

Our reverse osmosis filtration systems are cutting-edge, removing up to 99% of most contaminants. We manufacture a range of systems, guaranteeing that your system of choice is suitable for your exact needs. Whether you are interested in a whole house filter system, a system for your aquarium, a pond filtration system, or a deionisation system, we offer it all and more. RO-MAN also sells components parts such as replacement filters, cartridges, vessels and resin.

Expansion tankcalculation xls

Water filtration systems are the ideal way to accessing safe, clean drinking water in your home. Not only are they cost effective, but a whole house water filter can reduce the risk of disease, prevent unpleasant build-up of scum and protect the environment. The benefits are so great that there is simply no better time to invest in one of the best water filters on the market.

To protect the water heater, pipes, and other system components from excessive pressure when heating water, an expansion tank is added. A simple device, it is nothing more than a tank with a bladder (thick balloon) inside. The space between the bladder and the inner wall of the tank is pre-charged with air to closely match the neutral pressure of the system BEFORE the water is heated. Then, when heat is applied and the pressure goes up, the expanded water volume flows inside the bladder. The air outside the bladder compresses against the tank walls, providing the cushion needed to protect the rest of the system.

Remember, this is just a rule of thumb. In addition to water heater volume, an engineer will consider other factors when sizing and selecting a thermal expansion tank, such as entering and leaving water temperatures and minimum and maximum pressures. The expansion volume may then be calculated and a tank selected based on acceptance volume and overall volume. In most cases, the engineered expansion tank size will be smaller than the 10% of the water heater volume, but, for budgeting/planning purposes, this estimate will get you in the right ballpark.

Chilled waterexpansion tank sizing

Expansion tank sizingcalculator metric

David Swinson has worked for Heat Transfer Sales for over 35 years. His knowledge of HVAC and plumbing equipment is vast.

As a rule of thumb, a thermal expansion tank should be about 10% of the total water heater volume. Let’s take some examples:

Our websites and dashboards use cookies. By using our website, you agree to our use of cookies in accordance with our cookie policy. Dismiss

RO-MAN specialise in the manufacturing of high quality water purification and filtration systems for domestic, commercial and industrial environments.