# US 11,112,063 B2 · Sensor for a high-pressure line, and method for producing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,112,063 B2 - Document ID: US11112063B2 - Status: Granted - Kind: B2 - Application number: 16/061,480 - Filed: 2016-12-16 - Published: 2020-01-23 - Granted: 2021-09-07 - Earliest claimed: 2015-12-18 - Assignees: Sandvik Materials Technology Deutschland GmbH - Applicants: Sandvik Materials Technology Deutschland GmbH - Inventors: Udo Rauffmann; Christofer Hedvall; Thomas Froböse - Web page: https://patentgrep.com/patent/US11112063B2 ## CPC - F17D 5/06: using electric or acoustic means - B21C 1/22: specially adapted for making tubular articles (bending sheet metal into tubular form by drawing B21D5/10) - B21C 37/154: {Making multi-wall tubes} - F17D 5/02: Preventing, monitoring, or locating loss - G01M 5/0025: {of elongated objects, e.g. pipes, masts, towers or railways (G01M5/0058 takes precedence)} - G01M 5/0041: {by determining deflection or stress} - G01M 5/0066: {by exciting or detecting vibration or acceleration (vibration testing of structures G01M7/00)} - F17D: PIPE-LINE SYSTEMS; PIPE-LINES (pumps or compressors F04; fluid dynamics F15D; valves or the like F16K; pipes, laying pipes, supports, joints, branches, repairing, work on the entire line, accessories F16L; steam traps or the like F16T; fluid-pressure electric cables H01B9/06) - B21C: MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL - G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR ## Abstract Sensor for high-pressure line and method for manufacturing thereof. The sensor detects parameters or properties of fluid conducted in a high-pressure line while maintaining the high pressure of the fluid. The sensor includes an inner tube extending concentrically in the outer tube that together form a tube and at least one groove which extends in the inner surface of the outer tube or in the outer surface of the inner tube in a longitudinal direction, at least one signal line arranged in the groove, and at least one pick-up element connected to the signal line and arranged at least in the groove or in at least one recess which is provided at least in the outer surface of the inner tube or in the inner surface of the outer tube in addition to the at least one groove. The outer tube is in frictional connection with the inner tube. ## Claims ### Claim 1 A sensor for a high-pressure line comprising: an outer tube of metal with an outer surface, an inner surface, an outer diameter and an inner diameter, and an inner tube of metal with an outer surface, an inner surface, an outer diameter and an inner diameter, wherein the inner tube extends concentrically in the outer tube such that the inner tube and the outer tube together form a tube, and wherein the overall wall thickness measured as half of the difference between the outer diameter of the outer tube and the inner diameter of the inner tube is equal to or larger than the inner diameter of the inner tube; at least one groove extending in a longitudinal direction of the tube in the inner surface of the outer tube or in the outer surface of the inner tube; at least one signal line placed in the groove; and at least one pick-up element connected to the signal line, wherein the pick-up element is placed at least in the groove or in at least one recess provided in addition to the groove at least in the outer surface of the inner tube or in the inner surface of the outer tube, wherein the outer tube is in a frictional connection with the inner tube, and wherein the inner tube is a strain-hardened tube with a tensile strength of 900 N or more. ### Claim 2 (depends on 1) The sensor according to claim 1, wherein the sensor is a pressure sensor, and wherein the at least one pick-up element is a force pick-up element being in engagement with the inner tube such that the force pick-up element during operation of the sensor measures a force applied to the inner tube. ### Claim 3 (depends on 1) The sensor according to claim 1, wherein the sensor comprises three grooves extending in a longitudinal direction of the tube at least in the inner surface of the outer tube or in the outer surface of the inner tube, wherein in each of the three grooves at least one signal line is placed, wherein at least in each of the three grooves or in three recesses each abutting one of the three grooves a pick-up element connected to at least one signal line is placed, and wherein the pick-up elements in the longitudinal direction of the tube are located such there is a cross-sectional plane perpendicular to the longitudinal direction of the tube, which is intersecting all three pick-up elements. ### Claim 4 (depends on 3) The sensor according to claim 3, wherein the three pick-up elements are spaced from each other by 120° in the circumferential direction of the tube. ### Claim 5 (depends on 3) The sensor according to claim 3, wherein the three pick-up elements are force pick-up elements, such that the sensor is a pressure sensor. ### Claim 6 (depends on 5) The sensor according to claim 5, wherein the sensor in addition comprises a thermometer, wherein the thermometer is placed at least in a groove or in a recess placed at least in the outer surface of the inner tube or in the inner surface of the outer tube. ### Claim 7 (depends on 1) The sensor according to claim 1, wherein the inner tube has a larger elongation than the outer tube. ### Claim 8 (depends on 1) The sensor according to claim 1, wherein the overall wall thickness amounts to at least 3 mm. ### Claim 9 A sensor for a high-pressure line comprising: an outer tube of metal with an outer surface, an inner surface, an outer diameter and an inner diameter, and an inner tube of metal with an outer surface, an inner surface, an outer diameter and an inner diameter, wherein the inner tube extends concentrically in the outer tube such that the inner tube and the outer tube together form a tube, and wherein the overall wall thickness measured as half of the difference between the outer diameter of the outer tube and the inner diameter of the inner tube is equal to or larger than the inner diameter of the inner tube; at least one groove extending in a longitudinal direction of the tube in the inner surface of the outer tube or in the outer surface of the inner tube; at least one signal line placed in the groove; and at least one pick-up element connected to the signal line, wherein the pick-up element is placed at least in the groove or in at least one recess provided in addition to the groove at least in the outer surface of the inner tube or in the inner surface of the outer tube, wherein the outer tube is in a frictional connection with the inner tube, and wherein the inner tube has a larger elongation than the outer tube. ### Claim 10 (depends on 9) The sensor according to claim 9, wherein the sensor is a pressure sensor, and wherein the at least one pick-up element is a force pick-up element being in engagement with the inner tube such that the force pick-up element during operation of the sensor measures a force applied to the inner tube. ### Claim 11 (depends on 9) The sensor according to claim 9, wherein the sensor comprises three grooves extending in a longitudinal direction of the tube at least in the inner surface of the outer tube or in the outer surface of the inner tube, wherein in each of the three grooves at least one signal line is placed, wherein at least in each of the three grooves or in three recesses each abutting one of the three grooves a pick-up element connected to at least one signal line is placed, and wherein the pick-up elements in the longitudinal direction of the tube are located such there is a cross-sectional plane perpendicular to the longitudinal direction of the tube, which is intersecting all three pick-up elements. ### Claim 12 (depends on 11) The sensor according to claim 11, wherein the three pick-up elements are spaced from each other by 120° in the circumferential direction of the tube. ### Claim 13 (depends on 11) The sensor according to claim 11, wherein the three pick-up elements are force pick-up elements, such that the sensor is a pressure sensor. ### Claim 14 (depends on 13) The sensor according to claim 13, wherein the sensor in addition comprises a thermometer, wherein the thermometer is placed at least in a groove or in a recess placed at least in the outer surface of the inner tube or in the inner surface of the outer tube. ### Claim 15 (depends on 9) The sensor according to claim 9, wherein the overall wall thickness amounts to at least 3 mm. ### Claim 16 A method for manufacturing a sensor for a high-pressure line comprising the steps: providing an outer tube of metal with an outer surface, an inner surface, an outer diameter and an inner diameter; providing an inner tube of metal with an outer surface, an inner surface, an outer diameter and an inner diameter, wherein the outer diameter of the inner tube is smaller than the inner diameter of the outer tube, and wherein the overall wall thickness measured as a half of a difference between the outer diameter of the outer tube and the inner diameter of the inner tube is equal to or larger than the inner diameter of the inner tube; providing at least one groove extending in a longitudinal direction of the outer tube or of the inner tube into at least the inner surface of the outer tube or into the outer surface of the inner tube; placing at least one signal line in the groove; placing at least one pick-up element connected to the signal line at least in the groove or in at least one recess provided at least in the outer surface of the inner tube or in the inner surface of the outer tube; inserting the inner tube into the outer tube such that the inner tube extends in the outer tube; and drawing the inner tube and the outer tube together through a first drawing die having an inner tool surface forming the outer surface of the outer tube, wherein a tool diameter of the inner tool surface of the first drawing die is selected such that the by drawing the inner diameter of the outer tube is reduced such that after the drawing the outer tube is in frictional connection with the inner tube. ### Claim 17 (depends on 16) The method according to claim 16, wherein by the drawing of the inner tube and the outer tube together through the first drawing die a wall thickness of the outer tube and the inner diameter of the outer tube are reduced such that the outer diameter of the inner tube is reduced by at least 0.01 mm and by at most 0.3 mm. ### Claim 18 (depends on 17) The method according to claim 17, wherein by the drawing of the inner tube and the outer tube together through the first drawing die the inner diameter of the inner tube is not reduced. ### Claim 19 (depends on 16) The method according to claim 16, wherein providing the inner tube and providing the groove in the outer surface of the inner tube comprises the steps: providing a hollow of metal; and drawing the hollow through a second drawing die with an inner tool surface forming the outer surface of the inner tube into inner tube, wherein an inner tool diameter of the inner tool surface of the second drawing die is selected such that the outer diameter of the inner tube is smaller than the inner diameter of the outer tube, and wherein the inner tool surface of the second drawing die comprises at least one section projecting inwardly such that the at least one groove extending in a longitudinal direction of the inner tube is drawn into the outer surface of the inner tube. ### Claim 20 (depends on 19) The method according to claim 19, wherein the inner tool surface of the second drawing die comprises a plurality of sections projecting inwardly, such that a plurality of grooves is drawn into the outer surface of the inner tube in a longitudinal direction. ### Claim 21 (depends on 16) The method according to claim 16, wherein, prior to the step of inserting the inner tube into the outer tube, at least the inner tube is worked by chip forming machining, such that at least one recess is formed in the outer surface of the inner tube, and wherein the recess adjoins at least one groove.