Online density measurement method and device of petroleum transmission pipeline

Abstract

The invention discloses an online density measurement method and device of a petroleum transmission pipeline. The online density measurement device is characterized in that one section of process main pipeline (6) with a constant-temperature electric tracing and insulating function (17) is serially connected to a bypass pipeline arranged on a pipeline to be measured, and the inlet end and the outlet end of the process main pipeline (6) are respectively controlled by process valves. Starting from the process valve (13) at the inlet end of the process main pipeline (6), oil flowing through the process main pipeline (6) is sequentially subjected to the following flows of: 1, filtering and draining; 2, measuring of pressure difference of two filtering ends; 3, flow testing; 4, manual sampling; 5, online checking; 6, pressure detecting; 7, draining; 8, sampling of a sampling pump (3); 9, online checking; 10, heat expansion safety protecting; 11, online density detecting; 12; exhausting; 13, processing of an intelligent pressure transformer; and 14, pressure difference measuring, flow detecting, sampling, online density detecting, and sending of signals to an apparatus junction box (16) and then an SCADA (Supervisory Control And Data Acquisition) system by the intelligent pressure transformer.

Description

technical field [0001] The invention relates to a method and a device for measuring the online density of an oil pipeline. Involved in the field of quality inspection and pipeline system technology. Background technique [0002] For the on-line density measurement of oil pipelines, the previous technological method is to draw a bypass on the main oil pipeline, set a sampling pump and a density meter on the bypass, and then merge the bypass into the main pipeline. [0003] The disadvantages of this density measurement method are: 1. This method does not carry out online compensation of temperature and pressure for density measurement, which affects the accuracy of density measurement; 2. Due to the low cleanliness of the pipeline medium, impurities and iron filings contained in it The sampling pump is often blocked, resulting in failure and damage of the sampling pump, so that the continuous detection of the online density cannot be realized; 3. Using the bypass sampling met...

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Problems solved by technology

[0003] The disadvantages of this density measurement method are: 1. This method does not carry out online compensation of temperature and pressure for density measurement, which affects the accuracy of density measurement; 2. Due to the low cleanliness of the pipeline medium, impurities and iron filings contained in it The sampling pump is often blocked, resulting in failure and damage of the sampling pump, so that the continuous detection of the online density cannot be realized; 3. Using the bypass sampling method to measure the density is easy to cause thermal expansion of the pipeline and overpressure, thereby damaging the bypass measurement pipeline and measurement equipment; 4. The online verification of the density meter cannot be realized; 5. Since the bypass measurement method is directly connected to the main process pipeline, it is easy to cause the loss of the cathodic protection current of the pipeline, and the cathodic protection current is also likely to affect the operation and accuracy of the density measurement; 6. Without the monitoring of the instrument system, it is impossible to realize the detection and control of the measurement circuit in the SCADA system; 7. Without the sewage system, it is impossible to realize the maintenance of the equipment; 8. Without heat preservation and mixing heat, it is impossible to realize the open-air setting of the measurement circuit

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