| 摘要 |
A fluid (6) contained in a vessel (1) of multi-layer wall construction can intrude, because of damage or wear, through the inner containment layer (4) and signal a problem with the life expectancy or safety of the vessel. By providing vessel walls having alternating layers of conductive material (5) and non-conductive material (4), and by providing electrical connections (15, 16, 17) for effecting circuitry to an instrument for measuring electrical properties across the inner containment layer, then intrusion of fluid into or through the inner wall can be detected by the instrument. For a conductive fluid, the inner layer of the vessel wall (4) should be non-conductive and the layer covering that inner layer should be conductive (5). For a non-conductive fluid, the inner layer of the vessel wall should be conductive, and the layer covering that inner layer should be non-conductive which is covered by another conductive layer (3). In many instances, it is preferred that the electrical property measured is the change in resistance, on the megohm scale. Other electrical measurements, such as amperage, dielectric constants, power factor, loss factor, or capacitance can be made. |
