Product Announcement from Tempco Electric Heater Corporation
Circulation Heaters consist of Screw Plug or Flanged Immersion Heaters, depending on kilowatt rating and size, mated to a pressure vessel. All welded joints on the vessel and heater are hydrostatic pressure tested. Mounting brackets provide easy and quick installation.
· Low Carbon Steel Sheath—Applications include fluid heat transfer media, tar, high to low viscosity petroleum oils, asphalt, wax, molten salt, and other solutions not corrosive to a steel sheath.
· Incoloy® 800 Sheath— A Nickel (30-35%), Chromium (19-23%), Iron alloy. The high nickel content of this alloy contributes to its resistance to scaling and corrosion. Used in air heating and immersion heating of potable water and other liquids that are not corrosive to an Incoloy® 800 sheath
· Copper Sheath—Mainly used in clean water heating for washrooms, showers, rinse tanks and freeze protection of storage tanks.
· 316 Stainless Steel Sheath—A Chromium (16-18%), Nickel (11-14%), Iron Alloy with Molybdenum (2-3%) added to improve corrosion resistance in certain environments, especially those that would tend to cause pitting due to the presence of chlorides. Applications include deionized water.
Surface Metal Treatments:
Circulation 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.