Custom Tanks and Custom Accessories


Quality Control Steel manufactures a full range of water tanks for all industrial and residential applications. Here are some of the most common types of custom tanks requested for fruition for the QCS engineering team. If you have a specific requirement not mentioned, please inquire.

Commercial Hot Water 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 lined to prevent rusting, and the standard design working pressure is 125 psi, which exceeds typical city water main pressure.

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. Quality Control Steel expansion tanks include all the necessary FNPT openings to install valves, gauges and controls, and are available in galvanized or powder coated colors.

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. Quality Control Steel manufactures a range of recommended sizes based on boiler capacity.

Filter Vessels:

Water that contains particulates can be purified by passing it through a 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, anthracite, 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. Quality Control Steel has manufactured both the basic vessels and complete systems, although the filter medium is usually supplied and installed by others.

Hydropneumatic Tanks:

Any vessel that contains both water and air under pressure can be called a hydro pneumatic 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 round l and 2000 gallons or more. Quality Control Steel has manufactured hydropneumatic tanks up to 30,000 gallon capacity and above. 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 lined to prevent corrosion and have a design working pressure of 125# ASME. Quality Control Steel can manufacture the basic tank or supply all the components for a complete system ready to install.


The majority of hot water storage tanks are insulated to save energy. This can be done very cost effectively at the factory. These are the most popular systems:

Polyurethane Foam:

The standard system is a two component sprayed coating that expands and hardens to about two inches thick, for about an R16 insulation value. When cured, it is coated with 25 mils of semi- rigid white acrylic weatherproof coating. Any minor damage during shipment can easily be repaired in the field.
We can install most commercially available insulation types, some of which are clad with metal jackets.

Aluminum Jacket Insulation:

Semi-rigid Fiberglass with Aluminum Jacket insulation medium is purpose – manufactured semi-rigid premium quality fiberglass wrap with Kraft paper lining and flexible foil vapor barrier. The fiberglass filaments are laminated parallel to the facings for enhanced flexibility and maximum coverage.
After installation, the insulation is clad with an aluminum jacket to ASTM B-209 with a laminated 1 mil polyethylene moisture barrier on the tank side. Standard exterior jacket finish is embossed “stucco” pattern to minimize glare and resist minor damage. All tank connections are recessed and the ASME nameplate exposed. All seams are caulked with aluminum pigmented silicone for weather protection.