Expansion tanks are small vessels containing pressurized air that are components of closed water heating systems for both residential and commercial buildings. Modern tanks are called diaphragm expansion tanks and are attached and hang down from the boiler piping on the supply side of the system. Older models were larger, horizontal and connected from above the system.
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Patterson Industries (Canada) LimitedScarborough, ON 800-270-3737 At Patterson Industries (Canada), all aspects of quality engineering, designing and manufacturing are customized to meet individual specifications and comply with internationally recognized codes and standards. Their extensive line of quality products including expansion tanks, are competitively priced allowing you to get the product you deserve at a price you can afford.
Midwest Imperial Steel Fabricators, LLCOak Lawn, IL 800-282-1574 By working with Midwest Imperial Steel Fabricators you can rest easy knowing that all the details are covered, that you project will be made with the utmost focus on quality and it will be delivered on time. They will actively manage your project from conception through completion to ensure the expansion tanks you receive meet all of your standards and expectations.
Pope Scientific, Inc.Saukville, WI 262-268-9300 For over fifty years, Pope Scientific has been providing quality equipment, like expansion tanks. Today, they are internationally known with specialized technical expertise in both the design and manufacturing of distillation processing equipment as well as toll processing services. No matter if a product needed is routine or difficult and demanding, they will locate the best solution for you.
Riggins CompanyHampton, VA 800-689-7924 Riggins Company offers custom expansion tanks including storage tanks and field repair. In addition, we offer very custom design solutions requiring finite element analysis, mechanical or thermal design capabilities. Riggins Company has been providing specialized welding to the world`s leading industries and government installations for more than 40 years.
Mason Mfg., Inc.Decatur, IL 217-422-2770 Mason Mfg. is a leading producer of expansion tanks. We maintain a reputation for exceptional Quality, Service, and Dependability. Mason Mfg. is a valued vendor to some of the largest manufacturing companies in the world. From "concept" to "start up" we can work with your engineering, procurement and inspection personnel to assure your equipment fits your required service.
Louisville Exchanger & Vessel Inc.Louisville, KY 502-893-6575 We expertly custom design & fabricate A.S.M.E. code pressure vessels (including lined & coated vessels), heat exchangers & components, and do ASME vessel repair. Many top companies have taken advantage of our specialty fabrication: G.E. Power, DuPont, Worthington Steel, North American Stainless, etc.
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Expansion tanks are easy to maintain, and if they are pre-charged, these tanks are literally maintenance free. All repairs should be done by a certified plumber. These pressure tanks ensure constant pressure within the piping system, and act as a safety device. Without them, the boiler may explode, the pipes could burst and overflowing is a major concern. They are typically composed of a stainless steel tank, blue or green exterior paint and a rubber spacer called a diaphragm located on the inside of the tank. This diaphragm provides an air-tight seal and divides the tank in half-the bottom is pressurized air, while the top is left open for excess water from the boiler. Since they occasionally hold drinking water, expansion tanks, like boilers or other food processing tanks and water pressure tanks, must be sanitary, non-contaminating and conform to health standards. The interior walls of the tanks need to be smooth and groove free. Besides domestic and commercial closed heating systems, most vehicles contain smaller expansion tanks for their heating systems.
The purpose of expansion tanks is to absorb excess water pressure in a closed water heating system. Any water heated in a closed space will expand. Therefore, heating systems need additional space for the increased water volume when it is at a high temperature. The excess water enters the expansion tank, which is filled halfway with pressurized air at 12 psi and divided by a rubber diaphragm spacer. While the water volume is up, the extra water fills the tank. The top half of the tank is directly connected with the heating system, and when the temperature decreases, the pressurized air on the bottom half of the expansion tank pushes the water back into the boiler system. This ensures there will be no pipe damage because of too much pressure. Water heating systems without expansion tanks risk the internal boiler pressure increasing beyond the release setting of the pressure release valve (PRV). When the PRV opens, the water leaves the system and creates pressure that is too low. Expansion tanks are always properly charged with air, which shouldn't exceed 12 psi, or the water will boil and this consistency is a major benefit to using expansion tanks.
