Screw Plug Heater
Screw Plug Heater
Screw plug heaters are miniature versions of immersion heaters that use a threaded plug in place of the heater flange. After fitting into a threaded hexagonal head, one or more tubular heating elements are screwed straight through a threaded connection in the tank wall, vessel, or installed process line. Solutions in smaller containers that might or might not need temperature control can be easily heated with screw plug heaters. In the tank, the heaters can be positioned either vertically or horizontally. Both single-phase and three-phase power supply can be used with the heater.
In order to monitor and manage the temperature, the screw plug heaters also come with a thermowell where a temperature sensor can be attached. To guarantee that the heater is turned on and off at a predetermined temperature, a basic thermostat is typically fitted within the thermowell and pre-wired with the heater. For the operator’s convenience, the thermostat knob can be positioned outside the terminal cover.
Key Features
- Efficient Heating and operation
- Easy to install
- Maintenance-friendly
- Cost-effective
- Environmental performance
Specifications
| Sheath Material | SS, Alloy 600 series, Alloy 800 series, Hastelloy, Titanium, Copper, etc. |
|---|---|
| Power Rating | 0.1 kW to 50 kW |
| Screw Plug Material | CI, Carbon Steel, Brass, SS, etc. |
| Screw Plug NPT Fittings | 1″, 1¼″, 1½″, 2″, 2½″, 3″ (BSP/NPT) or equivalent Metric threads |
| Voltage | 120 to 690V AC Single phase or three-phase |
| Terminal Enclosure | Safe / Hazardous |
| Control | Thermocouple, RTD, Thermostat, Digitally controlled |
Construction
- Nickel Chromium Resistance wire for high mechanical and creep strength for maximum heater life. Nickel-Chromium resistance coil is fusion welded to the metallic terminal pins.
- High Purity magnesium oxide fill selected for maximum dielectric strength and thermal conductivity, highly compacted for maximum heat transfer.
- Stainless steel sheath / Inconel sheath for oxidation and corrosion resistance in a wide variety of environments and suitable for high temperature applications.
Sheath Selection Guide
| Material | Max Operating Temperature | Max Watt Density |
|---|---|---|
| Stainless Steel | 1200 °F | 120 W/in² |
| Steel | 750 °F | 120 W/in² |
| INCOLOY | 1600 °F | 120 W/in² |
| Application | Sheath Material | Screw Plug Material |
|---|---|---|
| Clean water, Freeze protection, Hot water storage, Boiler and water heaters, Cooling towers, Solutions not corrosive to copper | Copper | Steel |
| Hot water, Steam boilers, Mildly corrosive solutions (rinse tanks, spray washers) | Incoloy | Steel |
| Oils, Gases, Mildly corrosive liquids, Stagnant or heavy oils, High temperature, Low flow gas heating | Steel | Steel |
| Process water, Soap and detergent solutions, Soluble cutting oils, Demineralized or deionized water | Stainless Steel | Stainless Steel |
| Mildly corrosive solutions | Stainless Steel | Stainless Steel |
| Severe corrosive solutions, Demineralized water | Incoloy | Stainless Steel |
| Light Oil, Medium Oil | Steel | Steel |
| Food Equipment, Food Equipment with cut out | Incoloy | Stainless Steel |
Application Areas
- Clean water, hot water storage, portable water, freeze protection of liquids
- Hot water, steam boilers, mildly corrosive solutions (rinse tanks, spray washers), vapor degreasers
- Severe corrosive solutions, demineralized water, food equipment
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