Over-The-Side Heater Application Basics

Over-The-side Heaters incorporating Tubular heaters are intended for liquid immersion heating applications. These heaters are used primarily in tanks or drums and provide a convenient method of heating without installation of special fittings through the side walls of the tank or vessel. Heat is concentrated at the bottom of the assembly.

Catalog assemblies are offered in steel and nickel alloy sheath materials for different application medium and operating temperatures. Models include circular and straight hairpin shapes.

It is recommended that a number of smaller rated heaters be used in larger applications instead of one larger heater, both from a standpoint of better heat distribution and of easier replacement of heaters. Outputs that are too high may be reduced by running at a lower voltage or incorporating multiple circuits for variable heater output wattage.

Units include supports to elevate element above sludge in the bottom of the tank and away from any combustible surfaces or material. Please contact factory if additional support height is required.

Heater must be installed in system so that heater sheath tube is covered by liquid at all times during operation. A minimum of 2 inches (50.8 mm) of liquid should be maintained above heater tubes. Heating performance in tanks can be improved by agitation of the liquid in the tank.

Sheath corrosion resistance and watt density compatibility is extremely important in direct immersion heating applications. The suggested sheath watt densities in the tables should be considered maximums unless testing in the particular application shows that higher densities can be used.

important in direct immersion heating applications. The suggested sheath watt densities in the tables should be considered maximums unless testing in the particular application shows that higher densities can be used.

Please refer to general application guidelines, recommended watt densities, sheath temperature limitations, corrosion guide, and other engineering data to assist you with product selection.

Please do not hesitate to contact us for application or product assistance.