Magnetic memory based tightness detection method for flange and detection device and detection system thereof

Abstract

The invention relates to a magnetic memory based tightness detection method for a flange and a detection device and a detection system which are capable of realizing the detection method. The method comprises the following steps: A. carrying out calibration on magnetic memory sensors; B. fixing the magnetic memory sensors onto flange connecting bolts, and connecting the magnetic memory sensors with a data acquisition control device and a computer; C. acquiring the axial real-time magnetic memory signal values of the to-be-measured flange connecting bolts by a data acquisition unit, which are measured by the magnetic memory sensors; and D. comparing detected magnetic memory signal values with an allowable maximum magnetic memory signal value which can be borne by the bolts under the maximum stress condition and a minimum magnetic memory signal value of bolt stress required for ensuring the tightness of the flange, and then judging whether the stress borne by the flange connecting bolts is capable of ensuring the tightness of a connected flange plate or not. The tightness state of the flange can be rapidly detected in real time by the detection method and the detection device by utilizing the magnetic memory characteristic of a ferro magnetic material, and moreover, the goal of early diagnosis can be achieved under the working state of the flange.

Description

technical field [0001] The invention relates to a method, a detection device and a detection system for detecting the sealing performance of a flange, in particular to a method for detecting the sealing performance of a flange based on magnetic memory, and a detection device and a detection system capable of realizing the detection method. Background technique [0002] In petroleum, chemical and other industrial production, flange connection is a conventional connection method for pipelines and equipment. For example, in oil and gas exploration, gathering and transportation, and refining and chemical industries, most equipment connections are connected by flange bolts. Angle-shaped metal sealing ring, and rely on the pre-tightening force of the bolt to compress the steel ring to achieve the sealing effect. Due to the characteristics of high pressure, strong corrosiveness, and large pressure and temperature fluctuations in petroleum, chemical equipment, and fluid media in pip...

AI Technical Summary

Problems solved by technology

The bolt deformation detector has the advantages of simple principle and convenient use, but its detection accuracy is greatly affected by human factors

During the use of the thermal imaging detector, it is greatly affected by the ambient temperature, so it is not suitable for detecting the flange tightness of the equipment with large temperature fluctuations

Ultrasonic detectors are inefficient for flange sealing, and cannot detect the stress state of bolts. They cannot meet the flange detection requirements of pipelines and pressure vessels, and cannot achieve real-time monitoring.

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