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 opening, 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 180oF 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 .75", over a welded wire mesh. 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.
We can install most commercially available insulation types, some of which are clad with metal jackets.


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