Process Electric Heaters

Tubular Heaters Introduction, Sheath Material & Design Terminal Design Forming Typical Formations Type 1 - 6 Typical Formations Type 7 - 14 Typical Formations Type 15 - 22 Typical Formations Type 23 - 28 Bushings & Locator Rings Tubular Heater Standard Products Finned Tubular Heaters Single Ended Tubular Heaters Single Ended Finned Tubular Heaters Triangulated Tubular Heaters

Introduction | Process Heat & Control Systems | Tubular Heaters | Mighty-Blade Process Heaters | Pipe Plug Immersion Heaters | Flanged Immersion Heaters | Circulation Heaters | Heat Transfer Systems | Over-The-Side Immersion Heaters | Boiler & Water Heaters | Pipe Insert Heaters | Quartz Immersion Heaters | Bottom Mount Immersion Heaters | Dishwasher Heaters | Sink Sanitizer Immersion Heaters | Drum Heaters | Process Air Heaters | Enclosure Heaters | Semiconductor Processing Heaters | Air Heaters

Tubular Heaters

The most versatile of all electric heating elements, the tubular heater is capable of being formed into virtually any configuration. The basic design consists of a helical coil of nickel-chromium resistance wire precisely centered in a metal sheath. This coil is surrounded by magnesium oxide powder which is vibration loaded to insure even density throughout the length of the heater. This entire assembly is then reduced to the finished diameter, compacting the MgO and "freezing" the coil in the center of the heater. The range of ratings, sizes, materials and terminations available makes the tubular heater adaptable to many industrial, commercial and scientific applications.

Copper Sheath: Water heating, water solutions non-corrosive to copper. Steel Sheath: Immersion in oils, molten salt baths, alkaline cleaning solutions, tars and asphalt. Also suitable for clamping to metal surfaces and casting into aluminum. Stainless Steel Sheath: Corrosive liquids, food processing equipment. Incoloy Sheath: Air heating, radiant heating, cleaning and degreasing solutions, plating and pickling solutions, corrosive liquids. Other sheath materials are also available for application considerations. Commonly specified are 316 stainless steel and Carpenter 20 stainless steel for corrosive immersion heating, copper clad steel for metal casting, Inconel for high temperature applications, and titanium for severely corrosive solution heating. Porcelain and ceramic coatings can also be provided for corrosive atmospheres in process air applications, immersion heating, or for other application considerations.

Minimum Unheated Section On Each End: 1-1/4" 11-1/2" to 50" 1-1/2" 51" to 80" 1-5/8" 81" to 110" 1-3/4" 111" to 140" 2" 141" to 170" 2-1/4" 171" to 192" 2-1/2" 193" and Longer	Sheath Material Max. Sheath Temperature Max. Watts Per. Sq. In. Copper 350°F/175°C 55 Steel 750°F/400°C 22 Stainless Steel 1200°F/650°C 30 Incoloy 1500°F/815°C 40

Tolerances and Limitations  Sheath Diameter ±.005* .210 .250 .312 .375 .430/.437 .475/.490 .625  Minimum Sheath Length 11-1/2 11-1/2 11-1/2 11-1/2 11-1/2 11-1/2 11-1/2  Maximum Sheath Length 144 144 420 480 420 312 250  Maximum Voltage 240 250 250 480 600 600 600  Maximum Amps 12 15 30 30 40 40 40  Minimum OHMS/inch of EHL .177 .100 .060 .040 .040 .040 .050  Maximum OHMS/inch of EHL 8 17 21 21 21 21 17  Wattage +5%   -10%  Resistance +10%   -5%  Sheath Length ±1/2%  Effective Heated Length ±1% * Other diameters are available including metric sizes

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