Collecting conduit, apparatus and method for leakage monitoring and leakage location
A collecting conduit for leakage monitoring and leakage location at an installation, includes a support pipe having openings. An outer surface of the support pipe is covered by a layer being permeable to a substance to be monitored, at least on a segment extending in longitudinal direction of the support pipe. An electrically conductive layer extends in longitudinal direction. The substance (L) can at least penetrate into the electrically conductive layer and the electrically conductive layer has an ohmic resistance dependent on the substance penetrating into it. An apparatus and a method for leakage monitoring and leakage location are also provided.
1. A collecting conduit for leakage monitoring and leakage location at an installation, the collecting conduit comprising:
a support pipe having openings, an outer surface, an interior and a longitudinal direction;
a layer being permeable to a substance to be monitored and allowing the substance to pass into said interior of said support pipe through said openings, said layer covering said outer surface of said support pipe, at least on a segment extending in said longitudinal direction of said support pipe; and
an electrically conductive layer into which the substance can at least penetrate, said electrically conductive layer extending in said longitudinal direction and having an ohmic resistance depending on the substance penetrating into said electrically conductive layer.
2. The collecting conduit according to claim 1 , wherein said electrically conductive layer is made of a polymer material filled with carbon black.
3. The collecting conduit according to claim 2 , wherein said polymer material is EVA.
4. The collecting conduit according to claim 3 , wherein said carbon black has a concentration of between 20 and 25 percent by weight.
5. The collecting conduit according to claim 1 , wherein said electrically conductive layer is disposed on said outer surface of said support pipe.
6. The collecting conduit according to claim 5 , wherein said layer being permeable to the substance to be monitored is an electrically insulating layer surrounding said electrically conductive layer and covering said support pipe.
7. The collecting conduit according to claim 1 , wherein said electrically conductive layer completely covers said outer surface of said support pipe and is permeable to the substance.
8. An apparatus for leakage monitoring and leakage location at an installation, the apparatus comprising:
a collecting conduit according to claim 1 ; and
a device for detecting an electrical resistance of the electrically conductive layer.
9. A method for leakage monitoring and leakage location, the method comprising the following steps:
laying a collecting conduit according to claim 1 along a section;
detecting an electrical resistance of an electrically conductive layer of the collecting conduit;
using an increase in the resistance of the electrically conductive layer as a trigger for carrying out a measurement for leakage location; and
during the measurement for leakage location, pumping a fluid carrier medium through the collecting conduit and analyzing the fluid carrier medium with a sensor for a substance escaping during the leakage.