Pig including an X-ray fluorescence sensor
A pig for use in a pipeline is provided for determining the material of the pipeline in the context of an inline inspection. The pig includes a position determination unit and at least one braking arrangement for immobilizing the pig at a certain position in the pipeline. The pig also includes an X-ray fluorescence sensor.
1. A pig for use in a pipeline for determining the material of the pipeline in the context of an inline inspection, the pig comprising:
a position determination unit;
at least one braking arrangement for immobilizing the pig at a certain position in the pipeline;
an X-ray fluorescence sensor and/or an atomic emission spectroscopy arrangement (AES arrangement); and
a bypass system with a bypass valve through which a fluid flowing in the pipeline is led past the pig and/or through the pig,
wherein the bypass valve is pivotable about a pivot axis, wherein the bypass valve is asymmetrical about the pivot axis and is arranged on the pig so that the part of the bypass valve with a larger surface area can be acted upon by a fluid flowing in the pipeline with a force which moves the bypass valve in the direction of the closed position.
2. The pig according to claim 1 , wherein the position determination unit includes at least one of an odometer, a weld seam detection arrangement, and a signal receiver for positioning signals transmitted through the pipeline wall.
3. The pig according to claim 1 , further including:
a cleaning arrangement for cleaning a section of the pipeline wall to be analyzed by the X-ray fluorescence sensor and/or the atomic emission spectroscopy arrangement (AES arrangement).
4. The pig according to claim 1 , further including:
a drive unit for positioning the pig within the pipeline.
5. The pig according to claim 1 , wherein the bypass valve is formed in such a manner that a fluid flowing in the pipeline acts on the bypass valve with a force which moves the bypass valve in the direction of a closed position.
6. The pig according to claim 1 , wherein the pig comprises multiple X-ray fluorescence sensors for simultaneously determining the pipeline composition at multiple sites.
7. The pig according to claim 1 , wherein, on the X-ray fluorescence sensor, a proximity sensor is arranged, wherein the proximity sensor is configured to prevent the switching on of the X-ray fluorescence sensor if the proximity sensor is not in contact with a pipeline wall.
8. The pig according to claim 7 , wherein on the X-ray fluorescence sensor, at least two proximity sensors are arranged, which are configured to prevent the switching on of the X-ray fluorescence sensor as long as the proximity sensors are not all in contact with a pipeline wall.
9. The pig according to claim 1 , wherein, on the pig body, at least one first sealing element arranged adjacent to a first end of the pig body and at least one second sealing element arranged adjacent to a second end of the pig body are arranged, which sealing elements are spaced apart from one another and can be brought in contact with a pipeline inner wall, and the X-ray fluorescence sensor and/or the atomic emission spectroscopy arrangement (AES arrangement) is/are arranged between the first and second sealing elements.
10. The pig according to claim 9 , wherein a sealing element comprises an annular cavity which can be filled with a fluid, and via which the sealing element can be acted upon by a force which moves the sealing element in radial direction outward.