| 摘要 |
PROBLEM TO BE SOLVED: To provide a double piping structure which makes piping have a double structure, arranges a line-shaped detection sensor in a clearance of the piping, detects the occurrence of oil leakage in an early stage, can specify an occurrence place in a pin-point manner, and facilitates the repair work of the piping.SOLUTION: A double piping structure includes: primary piping in which at least a liquid such as gasoline or oil other than gasoline flows inside; secondary piping covered on the outside of the primary piping at a predetermined interval; an oil leakage detection line linearly arranged along the interval positioned on a lower part lower surface of the primary piping and a lower part upper surface of the secondary piping, and detecting the leakage of the liquid such as the gasoline or the oil other than the gasoline from the primary piping; and an oil leakage notification device which notifies the outside of oil leakage from the piping on the basis of a signal detected by the oil leakage detection line.SELECTED DRAWING: Figure 1 |
