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- W72322308 abstract "A leak-detection system developed by Asahi Engineering and Construction Co. Ltd. was incorporated into the two recently completed 29 mi, 14 in. underground jet fuel lines that connect Chiba port to Tokyo International Airport in Narita City. According to Asahi, the system can detect leaks as small as 3-5 1./min (27-45 bbl/day) of oil within 2 min by measuring changes in impedance of an electrically conducting cable laid alongside the pipeline. Both Type I cable, which detects leaked oil and water that penetrate the insulation, and is best suited for heat-insulated oil pipelines carrying heavy fuel or crude oil, and Type II cable, which selectively detects oil and is suited for conventional buried lines, have outer and inner conductors separated by insulation made of a special material that has a very low dielectric constant. For leak detection, a transducer associated with the cable continuously emits pulses, some of which are reflected back to the transducer if the pulses reach an area of changed impedance; the information received by the transducer is sent to a computer, which determines the location of the leak. The installation and performance of the leak detection system are discussed." @default.
- W72322308 created "2016-06-24" @default.
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- W72322308 date "1980-02-11" @default.
- W72322308 modified "2023-09-23" @default.
- W72322308 title "Pipelines laid after 6 year struggle" @default.
- W72322308 hasPublicationYear "1980" @default.
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