PRODUCT DESCRIPTIONA Screw Plug Immersion Heater can have from 1 to 3 elements, or blades, either welded or brazed into the screw plug. Screw plug immersion heaters consist of hairpin bent tubular elements brazed or welded into a screw plug and provided with terminal boxes for electrical connections. Screw plug immersion heaters are screwed directly through a threaded opening in a tank wall or through matching pipe coupling, half coupling or welding flange. Sizes of screw plug heaters are available with 1/2", 3/4" 1", 11/4", 2" and 21/2" pipe threads. A wide selection of screw plug sizes, kilowatt ratings, voltages, sheath materials, terminal housings, and thermostats makes these compact heaters ideal for all types of applications. Screw plug immersion heaters are used for heating liquids and gases in a variety of processes. These heaters are ideal for process water heating and freeze protection. All types of oils and heat transfer solutions can also be heated using these compact easily controlled units. The direct immersion method is energy efficient and well suited for many applications.
Screw Plug Immersion Heaters Specifications.pdf
How to Extend the Life of Your Immersion Heaters-2.pdf
Screw Plug Immersion_Heaters_Wiring_Diagrams-2.pdf
Screw Plug Immersion Heaters-Installation, Operation and Maintenance Instructions.pdf
Screw Plug Immersion Heater - Features:Buy Screw Plug Immersion Heaters | NPT Screw Plug Heaters
National pipe thread (NPT) screw into a mating fitting in your tank
Kilowatt range from low to medium (100 watts to 30 kw)
Easy to install into your tank
1" to 2 ½" NPT available
Metric and custom screw plugs can be made to match existing tank connections
purpose terminal enclosure (NEMA 1), weather resistant terminal enclosure
(NEMA 4), and hazardous location terminal enclosure (NEMA 7), available
Thermocouples, thermostats, and high limit controls can be built-in
Most Common Screw Plugs:
Brass, mild steel or 316 series stainless steel
Other materials available
1", 1 ¼", 1 ½", 2', and 2 ½" NPT are most common sizes
Other sizes or metric and British thread sizes can be made
Most Common Sheath Material:
Incoloy 800® & Incoloy 840®
Other Sheath Material Also Offered
Incoloy, Inconel are Inco Ltd registered trademarks.
Most Common Terminal Enclosures
General Purpose NEMA1
Weather Resistant NEMA 4, NEMA 4X, class 4
Hazardous Location NEMA 7
Built In Thermocouple Options:
"K" calibration thermocouple for high limit sheath protection
"J" calibration thermocouple for temperature control
Built In Thermostats:
Up to 240 volts, 25-amp single pole, single throw (SPST)
Up to 240 volts, 25-amp double pole, single throw (DPST)
Up to 600 volts, 15-amp triple pole, single throw (TPST)
-16 to 40°C (0-100°F)
10 to 10°C (50-250°F)
70 to 280°C (160-540°F)
160 to 370°C (320-700°F)
Listed below are some of the recommended watt densities to heat various fluids and gases.
(a) 90, 60 & 45 Watts/Square Inch
For industrial water heating of many acqueous solutions which accept heat easily.
(b) 23 Watts/Square Inch
Industrial process heating of many light oils and cooling fluids for some corrosive solutions along with air and gas heating.
(c) 15 & 12 Watts/Square Inch
For industrial heating of medium viscosity oils, high temperature air and gas heating.
(d) 8 Watts/Square Inch
For heating of #5 and #6 fuel oil, viscous materials, raw crude oil and residual oils.
(e) 6 Watts/Square Inch
For heating #6 fuel oil, very viscous materials and fluids that do not accept heat readily.