Online sampling device and method for oil pipeline

Abstract

The invention relates to an on-line sampling device and method for oil pipelines. The on-line sampling device is provided with a section of bypass on the main pipeline, the inlet of the bypass is connected with a sampling probe, and the sampling probe is connected to the main pipeline; A sampling pump is installed on the road, and a sampling circuit and an injection circuit are connected after the sampling pump. The outlet end of the injection circuit is connected to the main pipeline through a nozzle, and the sampling circuit takes representative samples, and the remaining liquid is finally imported into the main pipeline. The invention can realize reliable operation, real-time continuous operation, accurate sample quantity and precise loop flow control, and finally meet the requirements of representative sample acquisition, automatic sampling process and precise system control.

Description

technical field [0001] The invention relates to an on-line sampling device and method for an oil pipeline, belonging to the technical field of quality detection and pipeline sampling systems. Background technique [0002] For the on-line sampling technology of oil pipelines, the traditional methods are manual sampling or bypassing the main oil pipeline, setting sampling pumps and sampling equipment on the bypass, and then leading the bypass back into the main pipeline. [0003] The disadvantages of this kind of sampling device are: 1. Without a mixing device, it is impossible to ensure that the liquid in the pipeline is fully mixed, and the sample obtained may not be representative; 2. Without a sampling control system, it is impossible to realize the equipment status, power supply status, and sampling of the sampling system. Monitoring of loop flow rate and sampling frequency; 3. The flow measurement of the sampling loop is not performed, so it is impossible to judge whethe...

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Problems solved by technology

[0003] The disadvantages of this kind of sampling device are: 1. Without a mixing device, it is impossible to ensure that the liquid in the pipeline is fully mixed, and the sample obtained may not be representative; 2. Without a sampling control system, it is impossible to realize the equipment status, power supply status, and sampling of the sampling system. Monitoring of loop flow rate and sampling frequency; 3. The flow measurement of the sampling loop is not performed, so it is impossible to judge whether the liquid flow in the sampling loop is normal; 4. Due to the low cleanliness of the pipeline medium, the impurities contained in it often block the sampling pump, resulting in sampling The failure of the pump is damaged, so that continuous online sampling cannot be realized; 5. The pump outlet pipeline is prone to backflow; 6. Without a manual sampling device, sampling cannot be performed due to system failure; 7. Without a backup circuit, the system is prone to failure; 8. Sampling container protection facilities are not set up, which is prone to dangerous accidents of sample overflow; 9. No cleaning interface is not set up, which is not conducive to system maintenance and easily pollutes samples; 10. Temperature and pressure detection instruments are not set up, and there is a lack of monitoring of loop process parameters; 11. The flow control is not realized, and the flow rate of the sampling circuit cannot be changed according to the flow rate of the main pipeline; 12. The sampling rate and the number of samples are not proportional to the flow rate in the main pipeline

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