BLADDER TANKS:
Tanks that include an internal bladder are usually smaller, and sometimes called captive air or bag tanks. There are styles that are designed to replace the expansion tank in a domestic hot water or chilled water system. Most bladder tanks are standard vertical design. On larger versions, the bladder is often replaceable through a flange, which can be either on the top or bottom of the tank depending on the application.

BLOWDOWN TANKS:
Periodic boiler maintenance includes a blowdown cycle to reduce scaling. Local laws usually do not allow high temperature water to be dumped into sewers, and a blowdown tank system is designed to reduce temperatures by mixing cold water with the effluent. It also enables high pressure water to flash to steam safely. Hanson Tank manufactures a range of recommended sizes based on boiler capacity.

BUFFER TANKS:
Hanson can manufacture cylindrical buffer tanks in carbon or stainless steel for both hot and chilled water systems. Buffer or Volume tanks add extra capacity to any system that contains fluid. Their purpose is to increase the volume of water in the system to achieve optimum efficiency. The tanks are usually insulated to reduce unwanted heat transfer. Hanson Buffer tanks are normally vertical and as they are for indirect closed loop systems, are usually unlined. Without a buffer tank, rapid fluctuation of water temperature causes frequent stops and starts (“short cycling”) of the equipment. A correctly sized and located thermal buffer tanks significantly improve the performance and longevity of the entire system they are installed in.

EXPANSION TANKS:
Thermal expansion and contraction of the water in a heating system is contained in a small tank installed at the highest point in the system. Hanson expansion tanks include all the necessary FNPT openings to install valves, gauges and controls, and are available galvanized or plain. Industry standard sizes are from 15 to 400 U.S. gallons.

FILTER VESSELS:
Water that contains particulates can be purified by passing it through tank containing a filter medium. Depending on the nature of the contaminants and the eventual purpose of the filtered water, filter media can be sand, activated carbon, nthracite, or combinations of special materials. The incoming water flow is distributed evenly through the filter medium by a diffuser, and there is usually a back flow function designed into the system to flush out the contaminants periodically. Hanson Tank has manufactured both the basic vessels and complete systems, although the filter medium is usually supplied and installed by others.

HOT WATER STORAGE TANKS:
Hotels, apartment buildings, hospitals and other facilities that need constant supplies of hot water usually have a storage tank that has been sized to meet peak demands, even though the usage at these times exceeds the output of the heater. This is achieved by selecting a tank of sufficient size, with adequate insulation, and designed to prevent incoming cold water from mixing with the hot water supply. These tanks are normally lined to prevent rusting, and the standard design working pressure is 125 psi, which exceeds typical city water main pressure.
Hanson Tanks offers a full range of standard and custom water storage tanks, and has several of the most popular sizes in stock for immediate shipment.

HYDROPNEUMATIC TANKS:
Any vessel that contains both water and air under pressure can be called a hydropneumatic tank. The two most common applications are in well water systems, or as buffer tanks to absorb water hammer shocks in large capacity pumping systems. In both cases, the captive compressed air acts as a cushion which can exert or absorb pressure as required.

Large hydropneumatic tanks are usually horizontal and 2000 gallons or more. Hanson Tank has manufactured hydropneumatic tanks up to 30,000 gallon capacity. The size is determined by the needs of the system, and is approximately the drawdown gallons times four. A small air compressor can be included to replenish the air volume periodically as it is absorbed into the water. Sensors monitor the water level and pressure and automatically control compressor operation as required. These vessels are usually lined to prevent corrosion and have a design working pressure of 125# ASME. Hanson Tank can manufacture the basic tank or supply all the components for a complete system ready to install.

Tanks that include an internal bladder are usually smaller, and sometimes called captive air or bag tanks. There are styles that are designed to replace the expansion tank in a domestic hot water system. All bladder tanks are usually a standard vertical design. On larger versions, the bladder is often replaceable through a flange, which can be either on the top or bottom of the tank depending on the application.

Vertical hydropneumatic tanks can also have a diaphragm which can be fixed or floating. This virtually eliminates the absorption of the air into the water over time and makes the compressor unnecessary. These are built to order only.