Typical Applications
Low Carbon Steel
Sheath—Immersion heaters for fluid heat transfer media,
tar, high to low viscosity petroleum oils, asphalt, wax, molten salt,
and other solutions not corrosive to a steel sheath.
8 Watts/sq.in. Steel Sheath Immersion Heaters
Applications: Fuel Oils (Bunker C and Number 6)
15 Watts/sq.in. Steel Sheath Immersion
Heaters
Applications: Fuel Oils (Number 4 and 5)
23 Watts/sq.in. Steel Sheath Immersion
Heaters
Applications: Lightweight Oils, Heat Transfer Oils, Degreasing
Solutions
Standard Steel Sheath
Immersion Heater List |
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Incoloy® 800 Sheath—
Immersion heaters with Incoloy sheath are used for air heating and
immersion heating of potable water and other liquids that are not
corrosive to an Incoloy® 800 sheath
16 Watts/in.sq. Incoloy Sheath
Immersion Heaters.
Applications: Heat Transfer Oils, Liquid Paraffin
23 Watts/in.sq. Incoloy Sheath
Immersion Heaters.
Applications: Forced Air, Caustic Solutions, Degreasing Solutions
48 Watts/in.sq. Incoloy Sheath
Immersion Heaters.
Applications: Process Water
Stock and Standard
Incoloy Sheath Immersion Heater List |
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Optional Element Sheath
Materials
304 Stainless Steel— A Chromium (18-20%), Nickel
(8-11%), Iron Alloy used in the food industry, sterilizing solutions, air
heating and many organic and inorganic chemicals.
321 Stainless Steel— A Chromium (17-20%), Nickel
(9-13%), Iron Alloy modified with the addition of titanium to prevent
carbide precipitation and the resulting intergranular corrosion that can
take place in certain mediums when operating in the 800-1200°F (427-649°C)
temperature range. |
Surface Metal Treatments
Flanged Immersion Heater surfaces in contact with the material being
heated can be passivated or electro-polished to improve their resistance
to corrosion.
Passivation removes surface contamination, usually
iron, so that the optimum corrosion resistance of the stainless steel is
maintained. Surface contamination would come from the small amount of
steel that may be worn off a tool during the manufacturing process.
Passivating is accomplished by dipping the heater in a warm solution of
nitric acid.
Electro-Polishing is an electrochemical process that
removes surface imperfections and contaminants, enhancing the corrosion
resisting ability of the stainless steels. The resultant surface is clean,
smooth and bright. Many medical and food applications require this finish. |