Composite tubing

Claim 2

A composite tubing bundle of indeterminate continuous length of bendable, high strength construction with improved cushionlike, and crush resistant characteristics and controlled low-heat conductance per unit of insulation at service temperatures in excess of 500*F. for maintaining a conveyed fluid sample at constant elevated temperature comprising, at least one tubular sampling line having an O.D. in the range of one-eighth inches to 2 inches for conveying fluid therethrough, at least one heat transmitting trace line disposed in heat transfer relation along the length of said sampling line, a flexible thermal-barrier of high bulk, low density, and selfsupporting material disposed in controlled insulating relation with respect to said lines to provide a thermal temperature control gradient to maximize a uniform heat transfer between the lines and to minimize heat transfer to the exterior of the bundle, said thermal-barrier having an inner layer including a plurality of individual, continuous rope-like elements cabled together in spiraled relation around said lines with a lay at 360* of 2 inches to 20 inches per length of tubing, said rope-like elements being made from an inorganic, substantially incombustible fibrous material having a density less than 80 pcf. at ambient temperature, at least one other outer layer disposed in encompassing relation around said inner layer, said outer layer including a plurality of individual, continuous rope-like elements made from a heating insulating material cabled together around said outer layer and disposed in spiraled relation generally opposite to that of rope-like elements of said inner layer in relation to the longitudinal axis of said bundle, the thermal-barrier having between two and eight of said layers per inch of wall thickness of the composite bundle with the rope-like elements having a diameter, untensioned, approximately 1/8 inch to 1 inch, a sheath of extruded polymeric material disposed around said outer layer and having a smaller wall thickness as compared to the thickness of said thermal-barrier and coacting with the thermal-barrier to provide a cushion-like, self-support for the heating and sampling lines, said tubing bundle, as finished, having an O.D. in the range of 3/4 inches to 6 inches, the ratio of the O.D. of said bundle to the wall thickness of said thermal-barrier being in the range from 2:1 to 4:1 to provide a cushion-like, yet bendable self-support for the heating and sampling lines, and said thermal-barrier providing a thermal temperature gradient beneath the sheath sufficient to maintain said sheath substantially at its continuous temperature rating for trace line temperatures in excess of 500*F.

Claim 3

A composite tubing bundle in accordance with claim 1, including, a tape of polymeric material disposed in wrapped relation around said outer layer to hold the rope-lIke elements of said layers together in the form of a composite bundle beneath said sheath.

Claim 4

A composite tubing bundle in accordance with claim 1, including, a flexible thermal-separation layer defined by said inner layer being disposed around one of said lines and the outer layer being wrapped with the other line around said inner layer for maintaining said lines in spaced separation from one another, and said separation layer including a flexible rope-like element made of a substantially incombustible, inorganic material.

Claim 5

A composite tubing product in accordance with claim 3, wherein said thermal-barrier includes a plurality of layers of heat insulating rope-like elements disposed in superposed relation around said separation layer beneath said protective sheath.

Claim 6

A composite tubing product in accordance with claim 4, wherein certain of the layers of the rope-like elements of said thermal-barrier are comprised of a substantially incombustible, inorganic material, and others of the rope-like elements of said layers being comprised of a substantially combustible, organic material.

Claim 7

A composite tubing product in accordance with claim 4, wherein all of said layers of said thermal-barrier are comprised of a substantially incombustible, inorganic material.

Claim 8

A composite tubing product in accordance with claim 1, wherein the rope-like elements of certain of the outer layer of said thermal-barrier are comprised of substantially incombustible inorganic materials, and others of the rope-like elements of said layers being comprised or substantially combustible organic materials.

Claim 9

A composite tubing product in accordance with claim 1, wherein the rope-like elements of said inner layer are comprised of fibrous asbestos materials.

Claim 10

A composite tubing product in accordance with claim 1, wherein the rope-like elements of said inner layer are comprised of fiberglass material.

Claim 11

A composite tubing product in accordance with claim 1, wherein the rope-like elements of said outer layer are comprised of fibrous jute materials.

Claim 12

A composite tubing product in accordance with claim 1, wherein said heating line is comprised of a metallic material, and including a sleeve-like member disposed around said heating line.

Claim 13

A composite tubing product in accordance with claim 1, including a flexible fluid impervious sleeve-like metallic foil member disposed between at least one pair of adjacent layers of said thermal-barrier.

Claim 14

A composite tubing product in accordance with claim 1, wherein said lines are spirally wrapped in contiguous heat transfer relation with respect to one another.

Claim 15

A composite tubing product in accordance with claim 13, wherein said rope-like elements of said inner layer are spirally wrapped in complemental heat insulating relation with respect to said lines.

Claim 16

A composite tubing product in accordance with claim 1, wherein one of said lines is spirally wrapped in continguous heat transfer relation around the other of said lines.

Claim 17

A composite tubing product in accordance with claim 15, wherein said rope-like elements of said inner layer are spirally wrapped in generally complemental heat insulating relation around said lines.

Claim 18

A composite tubing product in accordance with claim 1, wherein one of said lines is disposed in generally concentric relation within the other of said lines.

Claim 19

A composite tubing product in accordance with claim 1, including a heat conductive sleeve-like member disposed around at least one of said lines.

Claim 20

A composite tubing product in accordance with claim 18, wherein said sleeve-like member is made of a metallic foil material wrapped in overlapping relation around at least one of said lines.

Claim 21

A deformable composite tubing bundle of indeterminate continuous length of bendable, high strength construction with improved cushion-like, and crush resistant characteristIcs and controlled low-heat conductance per unit of insulation at service temperatures in excess of 500*F. for maintaining a conveyed fluid sample at a substantially constant elevated temperature comprising, at least one tubular sampling line having an O.D. in the range of 1/8 inches to 2 inches for conveying fluid therethrough, at least one metallic heat transmitting trace line disposed in heat transfer relation along the length of said sampling line, a flexible thermal-barrier of high bulk, low density, and self-supporting material disposed in controlled insulating relation with respect to said lines to provide a thermal temperature control gradient to maximize a uniform heat transfer between the lines and to minimize heat transfer to the exterior of the bundle, said thermal-barrier having an inner layer including a plurality of individual, continuous rope-like elements cabled together in spiraled relation around said lines with a lay at 360* of between 2 inches and 20 inches per length of tubing, said rope-like elements being made from fibrous materials selected from the group comprising essentially asbestos and fiberglas having a density less than 80 pcf. at ambient temperature, at least one other layer disposed in encompassing relation around said inner layer, said outer layer including a plurality of individual, continuous rope-like elements made from asbestos having a density less than 80 pcf. cabled together around said outer layer and disposed in spiraled relation generally opposite to that of rope-like elements of said inner layer in relation to the longitudinal axis of said bundle, the thermal-barrier having between two and eight of said layers per inch of wall thickness of the composite bundle with the rope-like elements having a diameter, prior to application, between approximately one-eighth inch and 1 inch, a sheath of extruded polymeric material disposed around said outer layer and having a smaller wall thickness as compared to the thickness of said thermal-barrier and coacting with the thermal-barrier to provide a cushionlike, self-support for the heating and sampling lines, said tubing bundle, as finished, having an O.D. in the range of three-fourths inches to 6 inches, the ratio of the O.D. of said bundle to the wall thickness of said thermal-barrier being in the range of 2:1 to 4:1 to provide a cushion-like, yet bendable self-support for the heating and sampling lines, and said thermal-barrier providing a thermal temperature gradient beneath the sheath sufficient to maintain the outer surface of the sheath at approximately 175*F to 180*F at ambient temperature so as to maintain the sheath substantially at its continuous temperature rating for trace line temperatures in excess of 500*F.

Claim 22

A deformable composite tubing bundle of indeterminate continuous length of bendable, high strength construction with improved cushion-like, and crush resistant characteristIcs and controlled low-heat conductance per unit of insulation at service temperatures in excess of 500*F. for maintaining a conveyed fluid sample at a substantially constant elevated temperature comprising, at least one tubular sampling line having an O.D. in the range of 1/8 inches to 2 inches for conveying fluid therethrough, at least one metallic heat transmitting trace line disposed in heat transfer relation along the length of said sampling line, a flexible thermal-barrier of high bulk, low density, and self-supporting material disposed in controlled insulating relation with respect to said lines to provide a thermal temperature control gradient to maximize a uniform heat transfer between the lines and to minimize heat transfer to the exterior of the bundle, said thermal-barrier having an inner layer including a plurality of individual, continuous rope-like elements cabled together in spiraled relation around said lines with a lay at 360* of between 2 inches and 20 inches per length of tubing, said rope-like elements being made from fibrous materials selected from the group comprising essentially asbestos and fiberglas having a density less than 80 pcf. at ambient temperature, at least one other layer disposed in encompassing relation around said inner layer, said outer layer including a plurality of individual, continuous rope-like elements made from asbestos having a density less than 80 pcf. cabled together around said outer layer and disposed in spiraled relation generally opposite to that of rope-like elements of said inner layer in relation to the longitudinal axis of said bundle, the thermal-barrier having between two and eight of said layers per inch of wall thickness of the composite bundle with the rope-like elements having a diameter, prior to application, between approximately one-eighth inch and 1 inch, a sheath of extruded polymeric material disposed around said outer layer and having a smaller wall thickness as compared to the thickness of said thermal-barrier and coacting with the thermal-barrier to provide a cushionlike, self-support for the heating and sampling lines, said tubing bundle, as finished, having an O.D. in the range of three-fourths inches to 6 inches, the ratio of the O.D. of said bundle to the wall thickness of said thermal-barrier being in the range of 2:1 to 4:1 to provide a cushion-like, yet bendable self-support for the heating and sampling lines, and said thermal-barrier providing a thermal temperature gradient beneath the sheath sufficient to maintain the outer surface of the sheath at approximately 175*F to 180*F at ambient temperature so as to maintain the sheath substantially at its continuous temperature rating for trace line temperatures in excess of 500*F.

Claim 23

A composite tubing bundle having improved high temperature, low density characteristics adapted for use in fluid conveyance, said product comprising at least one heating line and at least one sampling line having heat conductive walls disposed in heat transfer relation with one another; a flexible thermal barrier disposed about said lines having a density of less than 80 pcf. and consisting of at least one inner layer of wound heat insulating rope-like material and at least one outer layer of wound heat insulating rope-like material disposed about the inner layer; the rope-like material of the inner layer having greater heat insulating properties than that of the outer layer, and a sheath of polymeric material providing a protective cover for the product.

Claim 24

A composite tubing bundle having improved high temperature, low density characteristics adapted for use in fluid conveyance, said product comprising at least one heating line and at least one sampling line having heat conductive walls disposed in heat transfer relation with one another; a flexible thermal barrier disposed about said lines having a density of less than 80 pcf. and consisting of at least one inner layer of wound heat insulating rope-like material and at least one outer layer of wound heat insulating rope-like material disposed about the inner layer; the rope-like material of the inner layer having greater heat insulating properties than that of the outer layer, and a sheath of polymeric material providing a protective cover for the product.

Claim 25

The composite tubing bundle of claim 21 wherein the said inner layer of heat insulating material is rope-like fiberglass spirally wound about the said lines and the outer layer is spirally wound rope-like asbestos.

Claim 26

A composite tubing product having improved high temperature, low density characteristics for use in fluid sampling, said tubing product comprising a sheath of polymeric material which is substantially circular in cross-section; at least one heat transmitting heating line and at least one tubular heat conductive sampling line disposed in heat transfer relation with one another and disposed along the longitudinal axis of the composite tubing product; and a flexible thermal-barrier material which is effective as a heat insulator at temperatures of 500*F. and above, said thermal barrier material substantially completely filling the space between the said lines and said sheath and supporting the said lines in the composite tubing product, said thermal-barrier material being a heat insulating rope-like incombustible inorganic material and having a density of less than 80 pcf.

Claim 27

A composite tubing product having improved high temperature, low density characteristics for use in fluid sampling, said tubing product comprising a sheath of polymeric material which is substantially circular in cross-section; at least one heat transmitting heating line and at least one tubular heat conductive sampling line disposed in heat transfer relation with one another and disposed along the longitudinal axis of the composite tubing product; and a flexible thermal-barrier material which is effective as a heat insulator at temperatures of 500*F. and above, said thermal barrier material substantially completely filling the space between the said lines and said sheath and supporting the said lines in the composite tubing product, said thermal-barrier material being a heat insulating rope-like incombustible inorganic material and having a density of less than 80 pcf.