CA2313032A1 - Temperature sensing device for metering fluids - Google Patents

Temperature sensing device for metering fluids Download PDF

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Publication number
CA2313032A1
CA2313032A1 CA002313032A CA2313032A CA2313032A1 CA 2313032 A1 CA2313032 A1 CA 2313032A1 CA 002313032 A CA002313032 A CA 002313032A CA 2313032 A CA2313032 A CA 2313032A CA 2313032 A1 CA2313032 A1 CA 2313032A1
Authority
CA
Canada
Prior art keywords
temperature sensing
housing
tube
thermowell
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002313032A
Other languages
French (fr)
Other versions
CA2313032C (en
Inventor
Spencer M. Nimberger
Kevin J. Cessac
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PGI International Ltd
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PGI International Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US09/374,126 external-priority patent/US6352361B1/en
Application filed by PGI International Ltd filed Critical PGI International Ltd
Publication of CA2313032A1 publication Critical patent/CA2313032A1/en
Application granted granted Critical
Publication of CA2313032C publication Critical patent/CA2313032C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/02—Compensating or correcting for variations in pressure, density or temperature
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/08—Protective devices, e.g. casings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow

Abstract

A thermowell assembly (20) shown in Figure 2 is positioned in a pipeline (10) for sensing the temperature of the fluid medium in the pipeline (10) for transmitting the sensed temperature to a meter (12). A temperature sensing probe is received within a temperature conducting tube (36) forming a thermowell and having a plurality of annular fins (40) extending thereabout. In the embodiments of Figures 1-7, a liquid (50) is provided in an annular space between the thermocouple (28) and the temperature conducting tube (36). Non-metallic members (70, 74, 80) are positioned between the pipeline (10) and the temperature transmitting tube (36) to isolate thermocouple (28) from ambient changes in the temperature of metal pipeline (10) which may result in an error in the temperature of the flow medium sensed by the thermowell assembly (20). High temperature embodiments shown in Figures 4 and do not contain any non-metal components and provide a minimal metal to metal contact between the metallic temperature conducting tube (36B) of the thermowell (20B) and the adjacent metal mounting structure (52B, 62B). The embodiments shown in Figures 8-12 illustrate a temperature sensing probe comprising a temperature sensing assembly (80F, 80G) mounted within the internal bore (37F, 37G) of the finned tube (36F, 36G). The temperature sensing assembly (80F, 80G) includes a carrier (82F, 81G) with epoxy (96F, 96G) mounting a temperature sensing element (93F, 93G) within the-carrier (82F, 81 G).

Claims (61)

1. A thermowell assembly for sensing the temperature of a fluid flowing along a conduit and transmitting the sensed temperature to a meter for calculating the volume of flow along the conduit, said thermowell assembly comprising:
a hollow closed end tube extending within said conduit past the longitudinal axis of said conduit to form a thermowell;
a temperature sensing probe extending within said thermowell and defining a space between said tube and said temperature sensing probe;
a heat conducting liquid in said space for transferring heat to said temperature sensing probe from said tube and flowing fluid; and a plurality of annular fins about said tube for thermal transfer to said temperature sensing probe.
2. The thermowell assembly as defined in claim 1 wherein said temperature sensing probe comprises a thermocouple.
3. The thermowell assembly as defined in claim 1 wherein said temperature sensing probe comprises a resistance temperature device.
4. The thermowell assembly as defined in claim 1 wherein said temperature sensing probe comprises a thermometer.
5. The thermowell assembly as defined in claim 1 wherein said temperature sensing probe comprises a thermistor.
6. The thermowell assembly as defined in claim 1 wherein said temperature sensing probe comprises a semiconductor sensor.
7. The thermowell assembly as defined in claim 1 wherein said temperature sensing probe comprises a hollow closed end carrier mounted entirely within said tube and having an internal bore; and a temperature sensing element mounted within said internal bore of said carrier.
8. The thermowell assembly as set forth in claim 1 wherein a nonmetallic thermal isolation member is positioned between the conduit and said temperature sensing probe for minimizing heat transfer between the conduit and the temperature sensing probe.
9. The thermowell assembly as defined in claim 8, further comprising:
a metallic mounting structure for said tube having an externally threaded lower end portion for threaded engagement with the conduit, said metallic mounting structure including a lower metallic housing having an externally threaded lower end portion in threaded engagement with the conduit and an internally threaded bowl-shaped upper end portion, said tube supported within said bowl-shaped upper end portion and extending downwardly therefrom; and an upper metallic housing having an externally threaded lower end portion threaded within said bowl-shaped upper end portion of said lower housing and securing said tube within said bowl-shaped upper end portion.
10. A high temperature thermowell assembly for sensing the temperature of a fluid flowing along a conduit and transmitting the sensed temperature to a meter for calculating the volume of flow along the conduit, said thermowell assembly comprising:
a hollow closed end tube extending within said conduit transversely of the fluid flow past the longitudinal axis of said conduit and defining a thermowell;
a temperature sensing probe mounted within said thermowell and defining a space between said tube and said temperature sensing probe;
a heat conducting liquid in said space for transferring heat to said temperature sensing probe from said tube and flowing fluid; and a metallic mounting structure for said tube including a lower metallic housing having an internally threaded bowl-shaped upper end portion defining an annular shoulder, said metallic tube having an outwardly extending flange projecting over said shoulder, said flange having a downwardly extending annular projection defining a relatively sharp lower edge engaging said shoulder in supporting relation.
11. The high temperature thermowell assembly as defined in claim 10 further comprising:
an upper metallic housing mounted on said lower metallic housing over said flange, said flange having an upwardly extending annular projection defining a relatively sharp upper edge for engaging said upper metallic housing in contact relation.
12. The high temperature thermowell assembly as defined in claim 10 wherein said flange has a laterally extending annular projection defining a relatively sharp outer edge for positioning said tube within said bowl-shaped upper end portion of said lower metallic housing.
13. The high temperature thermowell assembly as defined in claim 10 wherein said lower metallic housing has an externally threaded lower end portion mounted on said conduit.
14. The high temperature thermowell assembly as defined in claim 10 further comprising:
a mounting flange mounted on the conduit and a mating mounting flange for said thermowell assembly secured to the conduit mounting flange, said lower metallic housing being welded to said mounting flange for said thermowell assembly.
15. In a gas pipeline having a flow measuring instrument for gas flowing through the pipeline and a temperature sensing device positioned within an opening in the pipeline for sensing the temperature of the flowing gas in the pipeline for use in the flow calculation, said temperature sensing device comprising:
a hollow metallic outer tube extending within said pipeline transversely of the gas flow and having a closed end to define a thermowell;
a temperature sensing probe received within said thermowell;
a metallic housing mounting said sensing device on said pipeline; and a plurality of annular fins about said tube for thermal transfer to said temperature sensing probe from said tube.
16. The temperature sensing device as set forth in claim 15 wherein said fins have an outer diameter slightly less than the internal diameter of said opening in said pipeline thereby to provide a maximum surface area for said fins.
17. The temperature sensing device as set forth in claim 15 wherein said temperature sensing probe comprises a hollow closed end carrier mounted entirely within said tube and having an internal bore; and a temperature sensing element mounted within said internal bore of said carrier.
18. The temperature sensing device as set forth in claim 15 wherein a nonmetallic thermal isolation member is positioned between the pipeline and said thermowell for minimizing heat transfer between the pipeline and said thermowell.
19. The temperature sensing device as set forth in claim 15 further comprising an upper housing mounted on said first mentioned housing and supporting said temperature sensing probe thereon.
20. The temperature sensing device as defined in claim 19 wherein said tube has an upper laterally extending flange and is gripped tightly between said upper housing and said first mentioned housing.
21. The temperature sensing device as defined in claim 19 further comprising:
a nonmetallic thermal isolation member is positioned between said tube and said first mentioned housing, said thermal isolation member having an upper laterally extending flange defining opposed planar sealing surfaces between said tube and said first mentioned housing.
22. A temperature sensing device as defined in claim 21 further comprising:
a nonmetallic electrical isolation member positioned between said upper housing and said temperature sensing probe.
23. A temperature sensing device as defined in claim 15 wherein said metallic housing has a central bore therethrough and comprises:
an upper housing being externally threaded for mounting on said pipeline;
and an integral small diameter thin wall housing section extending downwardly into the pipeline.
24. A temperature sensing device as defined in claim 23 wherein a separate outer metal sleeve is mounted about said small diameter thin wall housing section between said metallic outer tube and said metallic housing for strengthening said small diameter thin wall housing section.
25. A temperature sensing device as defined in claim 24 further comprising:
an epoxy material between said metallic outer tube and said housing section for locking said tube and housing section together.
26. A temperature sensing device as defined in claim 24 wherein said small diameter thin wall housing section has a thickness less than about 1/5 the inner diameter of the bore through the small diameter thin wall housing section and the outer diameter of said metal sleeve is generally the same diameter as the outer diameter of said fins.
27. A temperature sensing device as defined in claim 15 wherein said metal sleeve has a plurality of openings arranged in a circle about the circumference of said metal sleeve.
28. A temperature sensing device as defined in claim 15 wherein said metallic housing bore has a central bore therethrough and comprises:
an upper large diameter housing externally threaded for mounting on said pipeline; and an integral small diameter thick wall housing section extending inwardly from said large diameter housing, the thickness of said thick wall housing section being at least 1/3 the inner diameter of the bore through said small diameter thick wall housing section.
29. A temperature sensing probe arranged and constructed for insertion within a thermowell defined by an internal bore of a tube positioned within a conduit for sensing the temperature of a fluid flowing along the conduit and transmitting the sensed temperature to an instrument for calculating the volume of flow along the conduit, said temperature sensing probe comprising:

a hollow closed end carrier arranged for mounting entirely within said internal bore of said tube and having an internal bore;
a temperature sensing element mounted within said internal bore of said carrier;
a wire connection extending from said temperature sensing element for transmitting the sensed temperature of the flowing fluid; and a thermal conducting adhesive material in said internal bore of said carrier about said wire connection and said temperature sensing element.
30. A temperature sensing probe as defined in claim 29 wherein said carrier has external screw threads and is adapted for being threaded within said internal bore of said tube.
31. A temperature sensing probe as defined in claim 29 wherein said thermal conducting adhesive material comprises an epoxy material.
32. A temperature sensing probe as defined in claim 29 further comprising a tubular member receiving said wire connection therein and extending within said internal bore of said carrier, said thermal conductive adhesive material securing said tubular member within said internal bore of said carrier.
33. A temperature sensing probe as set forth in claim 29 wherein said carrier is formed of an aluminum material.
34. A temperature sensing probe as set forth in claim 32 wherein said tubular member is formed of a plastic material.
35. A temperature sensing probe as set forth in claim 34 wherein said plastic tubular member exerts a compressive force against said carrier for maintaining said carrier within said internal bare of said tube.
36. A thermowell assembly mounted within an opening in the wall of a conduit for sensing the temperature of a fluid flowing along the conduit and transmitting the sensed temperature to an instrument for calculating the volume of flow along the conduit, said thermowell assembly comprising;
a hollow closed end tube extending within said conduit transversely of the fluid flow having a body defining an internal bore and a plurality of spaced annular fins extending about said body; the outer diameter of said annular fins being substantially greater than the outer diameter of said body; and a temperature sensing probe mounted within said internal bore of said body; said temperature sensing probe including:
a hollow closed end carrier mounted within said internal bore of said tube generally below the uppermost fin and having an internal bore;
a temperature sensing element mounted within said internal bore of said carrier;
a wire connection extending from said temperature sensing element for transmitting the sensed temperature of the flowing fluid; and a thermal conducting adhesive material in said internal bore of said carrier about said wire connection and said temperature sensing element.
37, A thermowell assembly as defined in claim 36 wherein said carrier has external screw threads and is threaded within said internal bore of said tube.
38. A thermowell assembly as defined in claim 36 wherein said thermal conducting adhesive material comprises an epoxy material.
39. A thermowell assembly as defined in claim 36 wherein said temperature sensing probe comprises a tubular member receiving said wire connection therein and extending within said internal bore of said carrier, said thermal conductive adhesive material securing said tubular member within said internal bore of said carrier.
40. A thermowell assembly as defined in claim 36 further comprising a mounting structure for mounting said hollow closed end tube within an internally threaded opening in said conduit, said mounting structure including an externally threaded housing threaded within said internally threaded opening and a small diameter tubular member connecting said housing to said closed end tube.
41, The thermowell assembly as defined in claim 36 wherein the external diameter of said fins is at least about 50 percent greater than the outer diameter of said body.
42. The thermowell assembly as set forth in claim 41 wherein the outer diameter of said fins is slightly less than the internal diameter of the opening in the wall of the conduit.
43. The thermowell assembly as defined in claim 36 further comprising a tubular member receiving said wire connection therein and extending within said internal bore of said carrier, said carrier being formed of a material having a high thermal conductivity and said tubular member being formed of a material having a low thermal conductivity.
44. The thermowell assembly as defined in claim 43 wherein said carrier is formed of aluminum and said tubular member is formed of a plastic material.
45. The thermowell assembly as defined in claim 36 further comprising a mounting structure for mounting said hollow closed end tube within an internally threaded opening in said conduit, said mounting structure including an externally threaded housing threaded within said internally threaded opening and a small diameter tubular member connecting said housing to said closed end tube.
46. The thermowell assembly as defined in claim 45 wherein said small diameter tubular member has a relatively thin wall and is formed of a metallic material having a thermal conductivity substantially lower than the thermal conductivity of the metal material forming said housing.
47. The thermowell assembly defined in claim 46 wherein said housing and said small diameter tubular member are formed of a similar metallic material, and said small diameter tubular member has a relatively thin wall less than about 0.060 inch over at least a major portion of its length.
48. The thermowell assembly as defined in claim 36 wherein said hollow closed end tube is formed of a material having a high thermal conductivity.
49. the thermowell assembly as set forth in claim 36 further comprising a metallic housing threaded within an opening in said conduit; and a nonmetallic sleeve threaded externally and internally is positioned between said hollow closed end tube and said metallic housing.
50. In a gas pipeline having a flow measuring instrument for gas flowing through the pipeline and a temperature sensing device positioned within an opening in the pipeline for sensing the temperature of the flowing gas in the pipeline for use in the flaw calculation, said temperature sensing device comprising:
a hollow metallic lower housing extending within said pipeline transversely of the gas flow and having a closed end to define a thermowell;
a temperature sensing probe received within said thermowell;
an upper metallic housing mounting said sensing device on said pipeline;
and a plurality of annular fins about said lower housing for thermal transfer to said temperature sensing probe from said tube;

said upper metallic housing having an integral downwardly extending thick wall intermediate housing section and an integral lower end housing section connected to said lower housing, said thick wall intermediate housing section having a thickness at least 1/5 the inner diameter of said thermowell over a major portion of its length.
51. The temperature sensing device as set forth in claim 50 wherein said fins have an outer diameter slightly less than the internal diameter of said opening in said pipeline thereby to provide a maximum surface area for said fins.
52. The temperature sensing device as set forth in claim 50 further comprising:
an epoxy between said lower housing and said thick wall intermediate housing section for bonding said thick wall housing section and lower housing together.
53. The temperature sensing device as set forth in claim 50 wherein the thickness of said thick wall housing section is at least about .100 inch.
54. In a gas pipeline having a flow measuring instrument for gas flowing through the pipeline and a temperature sensing device positioned within an opening in the pipeline for sensing the temperature of the flowing gas in the pipeline for use in the flow calculation, said temperature sensing device comprising:
a hollow metallic lower housing extending within said pipeline transversely of the gas flow and having a closed end to define a thermowell;

a temperature sensing probe received within said thermowell;
an upper metallic housing mounting said sensing device on said pipeline;
and a plurality of annular fins about said lower housing for thermal transfer to said temperature sensing probe from said tube;
said upper metallic housing having an integral downwardly extending thin wall intermediate housing section and an integral lower end housing section connected to said lower housing, and an outer stablizing sleeve secured between said lower housing and said upper housing for strengthening said thin wall intermediate housing section.
55. The temperature sensing device as defined in claim 54 wherein said sleeve has a plurality of spaced openings arranged in a circle about the outer circumference of said sleeve.
56. the temperature sensing device as defined in claim 55 wherein the thickness of said thin wall housing section is at feast less than 1/5 the internal diameter of said thermowell.
57. The temperature sensing device as defined in claim 56 wherein the thickness of said thin wall housing section is less than 0.060 inch for at feast a major portion of the length of said thin wall housing section.
58. The temperature sensing device as defined in claim 54 further comprising:

an epoxy between said lower housing and said sleeve about said thin wan housing section for bonding said lower housing to said sleeve and said thin wall housing section.
59. A method for sensing the temperature of a fluid flowing along a metallic conduit and transmitting the sensed temperature to a meter for calculating the volume of flow along the metallic conduit, said method comprising:
providing a temperature sensing probe including a temperature sensing element:
providing a metallic closed end temperature transfer tube to define a thermowell;
mounting said temperature sensing probe within said thermowell with said metallic temperature transfer tube exposed to the flowing fluid; and thermally isolating said metallic tube from said metallic conduit.
60. The method defined in claim 59 further comprising the steps of:
providing an externally threaded metal housing structure for said temperature sensing probe;
threading said externally threaded metal housing structure onto said metallic conduit; and electrically and thermally isolating said temperature sensing probe from said metal housing structure.
61. The method defined in claim 59 wherein the step of mounting said temperature sensing probe within said thermowell includes providing a thermal conductive fluid in the thermowell between said tube any said temperature sensing probe.
CA2313032A 1999-08-06 2000-06-29 Temperature sensing device for metering fluids Expired - Lifetime CA2313032C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US09/374,126 US6352361B1 (en) 1999-08-06 1999-08-06 Temperature sensing device for metering fluids
US09/374,126 1999-08-06
US09/546,498 2000-04-11
US09/546,498 US6485175B1 (en) 1999-08-06 2000-04-11 Temperature sensing device for metering fluids

Publications (2)

Publication Number Publication Date
CA2313032A1 true CA2313032A1 (en) 2001-02-06
CA2313032C CA2313032C (en) 2012-04-17

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CA2313032A Expired - Lifetime CA2313032C (en) 1999-08-06 2000-06-29 Temperature sensing device for metering fluids

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US (1) US6485175B1 (en)
EP (1) EP1074825A1 (en)
AU (2) AU776849B2 (en)
CA (1) CA2313032C (en)
GB (1) GB2352813B (en)
WO (1) WO2001011319A2 (en)

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Also Published As

Publication number Publication date
CA2313032C (en) 2012-04-17
GB2352813B (en) 2003-12-24
AU6609000A (en) 2001-03-05
GB0017669D0 (en) 2000-09-06
US6485175B1 (en) 2002-11-26
AU4869900A (en) 2001-02-08
GB2352813A (en) 2001-02-07
AU776849B2 (en) 2004-09-23
EP1074825A1 (en) 2001-02-07
WO2001011319A2 (en) 2001-02-15
WO2001011319A3 (en) 2002-01-31

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