COMPOSITE ELECTRICALLY HEATED TUBING PRODUCT

• US 3,727,029 A
• Filed: 07/06/1970
• Issued: 04/10/1973
• Est. Priority Date: 07/01/1964
• Status: Expired due to Term

• Current Assignee: Albert E. Chrow
• Original Assignee: Albert E. Chrow
• Inventors: Chrow, Albert E.
• Primary Examiner(s): Bartis, A.
• Application Number:
  US05/052,668
• Time in Patent Office: 1,009 Days
• Field of Search: 219/301,535,522,528,549 137/341 138/138,139 174/47 338/256,259,210,212,214
• US Class Current: 392/468
• CPC Class Codes: B29C 48/09 Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
• CPC Class Codes: B29C 48/15 incorporating preformed parts or layers, e.g. extrusion moulding around inserts
• CPC Class Codes: B29L 2031/779 Heating equipment
• CPC Class Codes: F16L 53/38 using elongate electric heating elements, e.g. wires or ribbons
• CPC Class Codes: F24H 1/142 using electric energy supply
• CPC Class Codes: G01N 2030/3053 using resistive heating
• CPC Class Codes: G01N 30/30 of temperature
• CPC Class Codes: H05B 3/56 Heating cables
• CPC Class Codes: Y10T 137/6606 With electric heating element

Abstract

An armored, corrosion-resistant, deformable composite tubing of uniform construction throughout its length which is adapted for use as a temperature-controlled sampling tubing comprises a flexible, heat conductive sampling line means having a passageway for transmitting a fluid therethrough. At least two electrical heating lines are helically disposed in heat transferring engagement around said sampling line, with the lines being in symmetrically disposed relationship with respect to each other and in engaging relation to the peripheral surface of said sampling line. A layer of fibrous filler material is disposed in encompassing and contacting relation around said sampling line means and said heating lines along the length thereof, and a layer of flexible tape helically is wound around the filler layer in encompassing and contacting relation to provide a moisture impervious barrier around the filler layer. A flexible polymeric layer encompassing and contacting said tape provides a protective and moisture resistant barrier, and a flexible, metallic, protective armor layer enclosing and contacting said polymeric layer provides high strength and crush resistance; and a flexible, polymeric outer sheath encompassing and contacting said protective armor layer throughout substantially its entire outer periphery so as to mechanically interlock therewith provides corrosion and moisture resistance.

Claims

1. An armored, deformable composite tubing product of generally uniform construction throughout its length which is adapted for use as a temperature-controlled, sampling tubing and which comprises:

a. a flexible, heat conductive sampling line means which has a passageway through it for conveying a fluid whose temperature is to be controlled;

b. at least two electrical heating lines helically wound around said sampling line means in engaged, heat transferring relation, said lines being in generally symmetrically disposed relation with respect to the outer peripheral surface of said sampling line means;

c. continuous, flexible polymeric strand means wound around said sampling line means and said heating lines for maintaining said heating lines in their helically disposed, engaged, heat transferring relation with said sampling line means;

d. a layer of fibrous filler material disposed in encompassing and contacting relation around said sampling line means and said heating lines along the length thereof;

e. a layer of flexible tape helically wound around said layer of filler material in encompassing and contacting relation to provide a moisture impervious barrier around said filler layer;

f. a flexible, polymeric layer encompassing and contacting said tape layer and providing a protective and moisture resistant barrier;

g. a flexible, metallic protective layer comprised of corrugated metal armor disposed around and contacting said polymeric layer throughout its length; and

h. a flexible, polymeric outer sheath encompassing and contacting said metallic layer with said outer sheath generally engaging the corrugations of the metal armor and mechanically interlocking with the corrugations.

2. A composite tubing in accordance with claim 1, wherein said sampling line is composed of stainless steel and said metallic cover is composed of flexible corrugated steel armor.

3. A composite tubing in accordance with claim 1, wherein said tape is disposed in about a 25 percent overlap.

4. A composite tubing in accordance with claim 1, wherein the wall thickness of said polymeric outer sheath is relatively thin as compared to the wall thickness of said filler material.

5. A composite tubing product made in accordance with claim 1, wherein said layer of tape comprises an asbestos-polymeric material laminated tape.

6. A composite tubing product made in accordance with claim 5, wherein said polymeric material comprises polyethylene terephthalate film.

7. A composite tubing product in accordance with claim 1, wherein said heating lines comprise a wire having a non-metallic flexible covering thereon.

8. A composite tubing product in accordance with claim 7, wherein said non-metallic cover includes a polymeric insulating tape.

9. A composite tubing product in accordance with claim 8, wherein said insulating tape is covered with a fiberglass braid.

10. A composite tubing product in accordance with claim 1, wherein the tape of said tape layer is spirally overlapped to provide a nominal buildup of a predetermined thickness.