SPHEREHOT- Tubular heaters

• Forced air heating
• Thermal forming machines
• Direct immersion in liquids
• Comfort radiant heaters
• Welded, brazed or clamped to tanks and pipes
• Hot runner moulds
• Combination radiant and convection heater for ovens and dryers

Spherehot Tabular Heaters are the most versatile and widely used source of electric heat for industrial, commercial and scientific applications. They can be designed in a wide range of electrical ratings, diameters, lengths, terminations, and sheath materials, Important and useful characteristics of tubular heaters are that they can be formed into virtually any shape, brazed or welded to any metal surface, and cast into metals. Carefully researched manufacturing methods and quality materials have made Spherehot tubular heaters stand apart from other heating elements claiming similar performance.

The cut-away view shows the tubular heater's basic construction. A computer designed helical coil of Nichrome or Kanthal wire is fusion welded to the stainless steel terminal cold pin. This coil assembly is precisely stretched and centered in the element metal sheath, which is then filled with Magnesium Oxide powder (MgO). The filled tube is then compacted by a roll reduction mill into a solid mass, permanently stabilizing the coil in the center of the tube while providing excellent heat transfer and dielectric strength between the coil and the sheath.

Product to Be Heated	Maximum Temperature Desired		Suggested Application	Sheath Material	Maximum Product Temperature °F	Maximum Permissible Watt Density
	°C	°F				W/In2	W/Cm²
Solids
moulds, Platens, Dies, Pipes, Tanks	760	1400	Clamp-On	INCOLOY	300 500 800 1000 1200 1400	30 20 15 10 7 2.5	4.7 3.1 2.3 1.6 1.1 0.4
Liquids
Water, Clean	120 290	250 550	Immersion Immersion	Copper INCOLOY®	250 550	80 40	12.4 6.2
Water Solutions, Mild Corrosion, Corrosive	95 95	200 200	Immersion Immersion	304SS INCOLOY®	200 200	50 50	7.8 7.8
Oil
Low Viscosity Med. Viscosity High Viscosity	85	180	Immersion	steel	180	23 15 6.5	3.6 2.3 1

Sheath Materiall	Max. Allowable Sheath Temp.
Sheath Materiall	°C	°F
Copper Steel MONEL® Stainless Steel INCOLOY® INCONEL®	175 400 480 650 870 870	350 750 900 1200 1600 1600