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Tubular Heaters Element Construction Assemblies Electrical Considerations Tubular heaters, commonly called Calrods®,
are comprised of resistance wire
coiled inside a sheath. Tubular heaters can be welded into a flange or screw plug; can be shaped into different configurations, and accessorized with fittings and leads. Tubulars can be placed in liquids, solids or gases. Tubulars can be used as infrared heaters. Sheath diameters comes in varying sizes from 1/16 inch to 1/2 inch. Popular uses for tubular heaters include: molten salt tank heaters; infrared heaters; mold heating; air heating (duct heaters); liquid heating by over-the-side tank heaters or through-the-wall flanged immersion heaters or screwplug immersion heaters; heat sealing bars; aluminum extrusion die heaters.
The elements can be constructed different
ways for different applications. Some of the element construction options
are:
Assemblies are constructed from
elements and other components in order to provide a functional heater for a
particular application. Examples of assemblies are: Options to these basic types of
assemblies include:
Electrical
Considerations:
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The wire is surrounded with MgO. MgO acts as both an electrical
insulator and as a heat transfer material. Sheath materials depend on the
heater's intended application. Copper can be used for water.
Stainless steel, carbon steel, Incoloy and Inconel are used for harsher
environments.