Ground wire-free non-conductive coating electric spark detection device and detection method thereof

Abstract

The invention discloses a ground wire-free non-conductive coating electric spark detection device which comprises a pulse high pressure generator on a trolley, wherein the pulse high pressure generator is serially connected to a divider resistor and a wire brush; high-frequency signal acquisition processors are arranged on two sides of the divider resistor; the high-frequency signal acquisition processors are connected to an alarm; the wire brush can move on a coating of a metal substrate. The detection method comprises the following steps: 1) detecting a voltage signal; if detecting that the voltage signal exists on the divider resistor, alarming by the alarm, wherein when detecting pinhole defect of the coating, high voltage breakdown occurs, charges move towards the metal substrate via the coating, weak transient current is generated in a serial line, voltage appears on two sides of the divider resistor, and the alarm alarms when the voltage is detected; 2) when detecting a current signal, alarming by the alarm if the current signal is detected, wherein when detecting pinhole defect of the coating, high voltage breakdown occurs, charges move towards the metal substrate via the coating and are detected by the high-frequency signal acquisition processors, and the alarm sends out a defect alarm.

Description

technical field [0001] The invention belongs to the technical field of electric spark detectors, and in particular relates to a non-conductive coating electric spark detection device without a ground wire and a detection method thereof, which are specifically used for detecting the dew point, pinhole, etc. Defect detection. Background technique [0002] At present, in the field of petroleum refining, petroleum and natural gas development and transportation industry, in order to ensure that the metal pipes used do not undergo corrosion failure during service, reduce the resistance of fluid transportation, and enhance the wear of fluid on the inner surface of the pipe, economical and safe applications are considered. Basically, many users choose to use internal / external coated pipes. After the pipe coating is processed, it is very necessary to inspect the quality of the coating. The analysis of coating failure accidents during use shows that tiny defects such as pinholes and...

AI Technical Summary

Problems solved by technology

This method brings the following problems: 1) The weight of hundreds of meters of wires is very heavy, which requires a lot of power capacity of the detector, which reduces the distance that the detector can travel at one time; 2) Friction and wear will occur on the surface of the wire and the coating, and the coating The surface state changes, reducing the thickness of the coating on the inner surface of the pipe, which may become the source of coating failure; 3) The surface of the wire and the coating will cause friction and wear. If it is used for coatings with high hygienic requirements such as water delivery, Changes in the surface state of the coating and friction debris cannot meet the requirements of relevant hygienic standards

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