EP0326259A1 - A liquid transporting pipeline having a liquid leakage sensor - Google Patents

A liquid transporting pipeline having a liquid leakage sensor Download PDF

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Publication number
EP0326259A1
EP0326259A1 EP89300375A EP89300375A EP0326259A1 EP 0326259 A1 EP0326259 A1 EP 0326259A1 EP 89300375 A EP89300375 A EP 89300375A EP 89300375 A EP89300375 A EP 89300375A EP 0326259 A1 EP0326259 A1 EP 0326259A1
Authority
EP
European Patent Office
Prior art keywords
liquid
pipeline
leakage sensor
liquid leakage
gap
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.)
Withdrawn
Application number
EP89300375A
Other languages
German (de)
English (en)
French (fr)
Inventor
Juji Akiba
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Junkosha Co Ltd
Original Assignee
Junkosha Co 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
Application filed by Junkosha Co Ltd filed Critical Junkosha Co Ltd
Publication of EP0326259A1 publication Critical patent/EP0326259A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/02—Preventing, monitoring, or locating loss
    • F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means

Definitions

  • the present invention relates to a liquid transporting pipeline, for example for transporting crude oil, having a liquid leakage sensor installed therealong.
  • Liquid-transporting pipelines installed in cold regions have an adiabatic or heat-insulating material installed around the outer circumference of the pipeline in order to prevent freezing of the liquid being transported, as described, for example, in Japanese Laid-Open Patent Application (Kokai) No. 58-129232.
  • the liquid leakage sensor in the form of a cable contained within a metal mesh container together with any communications lines, is not usually covered by the heat insulating material. Accordingly, when the air humidity reaches a state of supersaturation as a result of a drop in the ambient temperature, the moisture in the air may condense as water droplets on the outer circumference of the pipeline. These water droplets may penetrate areas between the electrodes of the liquid leakage sensor, causing a drop in impedance which results in the generation of a false leakage alarm.
  • the present invention was designed in order to solve the above-mentioned problem.
  • a liquid transporting pipeline having a liquid leakage sensor installed therealong and a heat insulating covering installed around the pipeline and the sensor, the covering having a gap between adjacent lengths thereof, and a bridging member of heat-insulating material bridging the gap between said adjacent lengths.
  • a perforated plastic tube 4 which contains a liquid leakage sensor 9 is installed along the length of an oil transporting steel pipeline 3.
  • a heating insulating material 5 consisting of glass wool and an outer covering 6 consisting of sheet steel are formed into suitable lengths which are installed around the pipeline 3 and tube 4 so that an insulated heavy-oil transporting pipeline is formed. Gaps exist between adjacent lengths of insulation. Usually there is no heat insulating material 5 or outer covering 6 installed around the intermediate length 7 of the liquid leakage sensor 9 installed along the bottom of the oil transporting pipeline 3.
  • An intermediate heat insulating part 1 consisting of glass wool which surrounds the intermediate length 7 of the sensor 9 and bridges the gap between adjacent sections of the heat insulating material 5 is supported by an outer covering 2 of sheet steel, and is tightly sealed by a silicone sealing material 8.
  • the liquid leakage sensor 9 contained in the perforated tube 4 is formed by installing around the circumference of a stranded conductor 10 of electrical soft copper successively (a) a dielectric 11 consisting of braided, expanded polytetrafluoroethylene (EPTFE) fibres, (b) an outer conductor 12 consisting of braided electrical soft copper wires, and (c) a protective covering 13 consisting of braided EPTFE fibres.
  • EPTFE expanded polytetrafluoroethylene

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
EP89300375A 1988-01-28 1989-01-16 A liquid transporting pipeline having a liquid leakage sensor Withdrawn EP0326259A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1072488U JPH01117759U (es) 1988-01-28 1988-01-28
JP10724/88 1988-01-28

Publications (1)

Publication Number Publication Date
EP0326259A1 true EP0326259A1 (en) 1989-08-02

Family

ID=11758235

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89300375A Withdrawn EP0326259A1 (en) 1988-01-28 1989-01-16 A liquid transporting pipeline having a liquid leakage sensor

Country Status (4)

Country Link
EP (1) EP0326259A1 (es)
JP (1) JPH01117759U (es)
AU (1) AU2759788A (es)
GB (1) GB2214603A (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112984238A (zh) * 2021-03-25 2021-06-18 南通市扬子橡塑有限公司 一种用于海洋装备工程橡胶波纹管

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI84295C (fi) * 1990-03-28 1991-11-11 Muotekno Ab Oy Preisolerat muffroerselement.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4013924A (en) * 1970-03-19 1977-03-22 A/S E. Rasmussen Methods and means for detecting the presence of moisture adjacent insulated pipes

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1311472A (en) * 1969-03-18 1973-03-28 Rasmussen As E Pipe system of heat insulated pipes including means for detecting the presence of moisture
GB1455415A (en) * 1973-03-26 1976-11-10 Rasmussen As E Insulated pipe system having means for detection of moisture in the insulation thereof
DE2709468A1 (de) * 1977-03-04 1978-09-07 Interatom Lecknachweis fuer fluessigmetall-rohrleitungen
US4295669A (en) * 1977-04-11 1981-10-20 Johns-Manville Corporation Thermal insulation especially for pipe, flanges and fittings
US4515397A (en) * 1983-04-01 1985-05-07 Union Carbide Corporation Vacuum insulated conduit
US4509561A (en) * 1983-04-28 1985-04-09 Power Piping Company Insulation device for application to an uninsulated portion of a preinsulated pipe
EP0188363A1 (en) * 1985-01-14 1986-07-23 Shaw Industries Ltd. Preinsulated pipeline joint
DE3628336A1 (de) * 1986-08-21 1988-02-25 Roero Ges Fuer Isolier Und Fer Rohrleitungssystem und waermeisolierte rohre, z.b. fuer fernheizleitungen
GB8623082D0 (en) * 1986-09-25 1986-10-29 Raychem Gmbh Heated conduit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4013924A (en) * 1970-03-19 1977-03-22 A/S E. Rasmussen Methods and means for detecting the presence of moisture adjacent insulated pipes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112984238A (zh) * 2021-03-25 2021-06-18 南通市扬子橡塑有限公司 一种用于海洋装备工程橡胶波纹管
CN112984238B (zh) * 2021-03-25 2023-07-04 南通市扬子橡塑有限公司 一种用于海洋装备工程橡胶波纹管

Also Published As

Publication number Publication date
GB8900860D0 (en) 1989-03-08
AU2759788A (en) 1989-08-03
JPH01117759U (es) 1989-08-09
GB2214603A (en) 1989-09-06

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