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. Read More…
Leading Manufacturers
Midwest Imperial Steel Fabricators, LLC
Oak Lawn, IL | 800-282-1574If you are looking for innovative pressure vessels, you’ve come to the right place! We actively manage your project every step of the way. We keep you informed of what we are doing to ensure we keep up to your standards and delivery times.
Gladwin Tank Mfg., Inc.
Gladwin, MI | 989-426-4768Gladwin Tank Manufacturing specializes in custom designed and built ASME tanks and ASME jacketed weldments of any shape or size made from carbon steel, stainless, duplex and nickel alloys.
Rexarc International
West Alexandria, OH | 937-307-3597Rexarc is the global leader in acetylene gas plant production, and is trusted in over 50 countries around the world with the generation, purification, and compression of the highly volatile gas. We have the knowledge, attitude, equipment, and processes to support your needs in the vessel production. We also offer value added services of piping, instrumentation, paint, and other controls integration.
Sho-Me Fabrication, LLC
Springfield, MO | 417-459-9906Sho-Me Fabrication, LLC is a Missouri based pressure vessels manufacturer. We are a leading and trusted manufacturer, providing the best service and products in the industry. Our highly skilled and experienced workers have quick turnaround with high quality products. Sho-Me Fabrication is able to fabricate your customized product on site or in our facilities. Contact us to see how we can customize a product to fit your needs.
Engineered Pressure Systems Inc.
Haverhill, MA | 978-469-8280EPSI designs high-pressure systems for manufacturing, testing, research and specialized high-pressure applications. With its unique application-specific approach to R&D, manufacturing, and testing, EPSI has built a tradition of excellence in high-pressure engineering and technology worldwide.
Tank Fab, Inc.
Rocky Point, NC | 910-675-8999Tank Fab is a fully-integrated pressure vessel manufacturer of ASME and API 650 code autoclave systems. Some of our products include ASME pressure vessels and ASME tanks. We have over 30 years of experience designing autoclave systems—trust us with your next project!
Alloy Engineering Company
Berea, OH | 440-243-6800Alloy Engineering is ASME code vessel certified and offers extensive expertise in the mechanical design of pressure vessels that will meet rigorous quality standards and procedures. High expertise in the design of vessels fabricated from high-nickel and exotic alloys. Our designs are frequently used in applications with design process conditions up to 1700°F. We also specialize in redesigning current applications to provide more cost-effective and higher performance with longer life.
Expansion Tanks - Gladwin Tank Mfg., Inc.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.
Expansion Tanks - Gladwin Tank Mfg., Inc.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.
