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Tubular Immersion Heater SCREW PLUG TYPE  Screw plug heaters are used for heating liquids and gases in a variety of processes. Basically hairpin bend tubular elements are welded or brazed into a screw plug. Terminals and electrical connectors are provided in a box. Heaters with built-in thermostat have a thermowell i.e. a hollow tube sealed at one end which is welded or brazed to the screw plug. A temperature sensing thermostat bulb can be inserted in the tube without the necessity of draining liquid. Application Sheath materials used for heating various liquids and solutions are copper,
stainless steel, steel and Incoloy. Typical Sheath Applications Air and gas flowAnti-Freeze (Glycol) SolutionsCaustic Solutions Chemical Baths Hydraulic oil, crude oil and asphalt Industrial water rinse tanks Lubricating oils at API specified watt densitiesParaffin Vapor Degreasers Water:Deionized
Demineralized
Clean
Process
Features Watt densities to 100 W/Sq. In. Integral thermowell for thermostat bulb Nema standard housing Corrosion resistant hardware Stainless Steel, Steel, Incoloy and Copper Sheath materials Compacted hairpin bends Brass, Stainless Steel and Steel screw plugs APPLICATION | SCREW PLUG SIZE | SHEATH MATERIAL | SCREW PLUG MATERIAL | Clean Water | 1" | Copper | Brass | | 1�" | Copper | Brass | | 2" | Copper | Brass | | 2" | Incoloy | Brass | | 2�" | Copper | Brass | | 2�" | Copper | Brass | Process Water | 1" | SS | SS | | 2" | SS | SS | | 2�" | SS | SS | Solution Water | 2" | Incoloy | SS | | 2�" | Incoloy | SS | Light weight oil | 1" | Steel | Steel | | 1�" | Steel | Steel | | 2" | Steel | Steel | | 2�" | Steel | Steel | Medium weight oil | 2" | Steel | Steel | | 2�" | Steel | Steel | Heavy weight oil | 2" | Steel | Steel | | 2� | Steel | Steel | | 1/2" | Incoloy | Steel | | 1/2" | SS | Steel | | 1/2" | Incoloy | Brass | | 1/2" | SS | Brass | | 1/2" | SS | SS | | 3/4" | Incoloy | Steel | | 3/4" | SS | Steel | | 3/4" | Incoloy | Brass | Specialty | 3/4" | SS | Brass | Heaters oil and | 1" | Copper | Brass | corrosion fluids | 1" | SS | SS | | 1" | Steel | Steel | | 1" | Incoloy | Brass | | 1�" | Copper | Brass | | 2" | Incoloy | Brass |
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