Stainless and Carbon Steel ASME Pressure Vessels 20 to 20,000 Gallons

OVERVIEW

Hanson Tank manufactures a full range of ASME water tanks for all industrial and residential applications. Here are some of the most common types, which can be built for either horizontal or vertical installations. Types of supports available include saddles, legs, ring bases or as required. If you have a specific requirement not mentioned, please inquire.

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 mains 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. 

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. 

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. 

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. Hanson Tank 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 hydropneumatic tank. However, 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. A small air compressor can be used to replenish the air volume periodically as it is absorbed into the water. These vessels are usually lined to prevent corrosion. Hanson Tank can manufacture the basic tank or supply a complete system. 

SIZES:

Hanson Tank manufactures water tanks from 12" to 12' in diameter up to 70 feet long. Although standard tank heads (end caps) are manufactured in 6" increments, any diameter or length of vessel is available. Here are some typical sizes. Please note that all our tanks are cylindrical. Rectangular or square pressure vessels are very unusual and not part of our product line. 
12" x 34" 15 US gallons  ( .46 gallons per inch)
18" x 49"  50 US gallons  ( 1.06 gallons per inch)
24" x 65"  120 US gallons  ( 1.9 gallons per inch)
30" x 70"  200 US gallons  ( 3.0 gallons per inch)
36" x 88"  360 US gallons  ( 4.3 gallons per inch)
42" x 96"  520 US gallons  ( 5.8 gallons per inch)
48" x 104"  735 US gallons  ( 7.7 gallons per inch)
54" x 115"  1040 US gallons  ( 9.7 gallons per inch)
60" x 160"  1820 US gallons  (12.2 gallons per inch)
66" x 182"  2500 US gallons  (14.6 gallons per inch)
72" x 231"  3800 US gallons  (17.6 gallons per inch)
78" x 236"  4550 US gallons  (20.7 gallons per inch)
84" x 229"  5000 US gallons  (23.0 gallons per inch)
96" x 275"  8000 US gallons  (31.3 gallons per inch)
120" x 360"  16400 US gallons  (48.5 gallons per inch)
144" x 576"  37700 US gallons  (70.5 gallons per inch)

LININGS

Here is a list of the most popular tank linings, with their characteristics. Service life is impossible to predict, as there are dozens of factors involved, especially the temperature and Ph level of the water. However, as all Hanson lined water tanks are equipped with an access man way, regular inspection of the lining is easy. 
Epoxy:
 Sprayed on to a sand blasted surface, epoxy linings have a durable, glossy surface. Typically lower in cost than other linings, they offer excellent durability during shipping and handling but can deteriorate if water temperatures of 200 f or more are encountered. 
Glass:
More correctly called "porcelain enamel", glass lining is sprayed onto a sand blasted surface, and then fired at 1500 f to fuse it to the tank interior. Although the surface is smooth and continuous, minor imperfections are normal, and protected by the installation of anodes. These deteriorate first, and must be checked periodically and replaced when necessary. The glass lining can be damaged during shipment, and the tank must be skidded for shipment. 
Cement:
The tank interior is coated with a special blend of Portland cement to a thickness of .50" to .75", over a welded wire mesh in larger sizes. The lining must be kept moist up to the time the vessel is put into service to prevent cracking. Careful handling of the tank is also necessary to avoid damage . If periodic inspections reveal damage or erosion of the lining during service, field repairs can be carried out. 
Galvanizing:
 After preparation, the tank is submerged in molten zinc, which coats both the inside and outside with a thin layer. Due to the size limits of the vats available, galvanizing is more common on smaller tanks, and although an option, is rarely used on large hot water storage tanks. However, it is frequently specified on smaller vessels such as expansion tanks. 

INSULATION

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. 
Fiberglass with Metal Jacket:
The insulation medium is premium quality fiberglass filament laminated at 90 degrees to the tank surface, and clad with an aluminum jacket. Both the insulation and the jacket have moisture barriers. All seams are caulked for complete weather protection. Light gauge galvanized steel jackets are also offered. The insulation value is R8 at a thickness of 2 inches. 
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