Flexible radiant tube heater

Details Flexible radiant tube heater Flexible radiant tube heater

1988-03-21

1989-01-03

Goldberg, E. A.

Electric heating

Heating devices

With heater-unit housing, casing, or support means

219535, 338214, H05B 340

Patent

active

047958855

ABSTRACT:
A flexible radiant tube heater is disclosed herein which is particularly useful in thermally stress-relieving the U-bend sections of the heat exchange tubes within nuclear steam generators. The apparatus generally comprises an elongated, flexible mandrel formed from a spring composed of a heat-resistant alloy, a flexible electrical resistance heating element wound around the mandrel spring, and a flexible insulating sleeve formed from braided alumina fibers disposed around the heating element for electrically insulating the heating element from both the metallic spring and the inner walls of the tube. A nosepiece assembly and an endpiece are disposed on the front and back ends of the spring, respectively. A flexible reinforcing member which may be a thin rod of Inconel.TM. is mounted to both the nosepiece assembly and the endpiece and disposed through the windings of the mandrel coil in order to lend more tensile and compressive strength to the mandrel coil. A push rod formed from a stainless steel cable is connected to the endpiece for sliding the heater to a desired location in a tube.

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EPRI Document No. NP-3056 entitled "In Situ Heat Treatment and Polythionic Acid Testing of Inconel 600 Row 1 Steam Generator U-Bends", pp. 5-1-5-2, 1-1-1-4 and 2-1, dated Apr., 1983.
Publication, "Everything You Ever Wanted to Know About Electric Heaters and Control Systems", by Watlow, Inc.

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