Oil conveying pipeline on-line density measuring device

Abstract

The invention discloses an oil conveying pipeline on-line density measuring device. A process main pipeline [6] of a constant-temperature electric heat tracing and thermal insulation device [17] is connected in series to a pipeline to be tested through a flange (1) [1] and a flange (2) [35] at the two outer ends, and is sequentially provided with parallel filter (1) [2] and filter (2) [38] and a differential pressure transmitter [10], a flow switch [11], a serial process valve (6) [23], a bypass manual sampling valve [14], a bypass on-line verification port (1) [8], a bypass in-situ pressure gauge [12], a bypass drainage pipeline [7], a sampling pump [3], a serial process valve (7) [24], a bypass on-line verification port (2) [37], a bypass thermal expansion safety valve [5], an on-line densimeter [4], a bypass exhaust valve [15], a bypass drainage pipeline [7] and an intelligent pressure transmitter [9] which are arranged in front of and behind the filters from the inlet end; and an instrument junction box [16] is connected with an SCADA (Supervisory Control And Data Acquisition) system.

Description

technical field [0001] The invention is an online density measuring device for 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 method to measure the density ...

AI Technical Summary

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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