Marine pipeline detection device based on heterogeneous field

Abstract

The invention belongs to the technical field of nondestructive testing, and discloses a marine pipeline detection device based on a heterogeneous field. The marine pipeline detection device is characterized in that the marine pipeline detection device comprises a yoke iron, permanent magnets, coils and a Hall sensor; the bottoms of the two ends of the yoke iron are respectively attracted with permanent magnets; the magnetic poles of the two permanent magnets are oppositely arranged up and down; the coils are fixed to the bottoms of the two permanent magnets respectively; and the Hall sensor isarranged on the upper surface of an object to be detected and electrically connected with a magnetic flux leakage detection device. The novel marine pipeline detection device can rapidly detect the defects of marine pipelines, and magnetic flux leakage, eddy current and ultrasonic detection is simultaneously carried out on the object to be detected by taking the coils and the permanent magnets asexcitation sources at the same time, so that integral detection of the pipelines is realized and complete collection of data of the defects of the inner wall and the defects of the outer wall of thepipelines is realized.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and in particular relates to a detection device for marine pipelines based on a heterogeneous field. Background technique [0002] Oil and gas pipelines work in a complex environment for a long time, and the inner and outer walls of the pipeline will have defects due to wear or corrosion. Most of the current pipelines are made of ferromagnetic materials, and the commonly used testing methods are magnetic flux leakage testing or eddy current testing. Among them, magnetic flux leakage detection is now widely used in the defect detection of pipelines. Its principle uses the magnetic flux density distribution of ferromagnetic materials to detect changes in the magnetic field caused by changes in defects. Eddy current testing is usually suitable for the outer surface of the measured object. Since the measured object is a ferromagnetic material, the skin depth of the eddy current is ve...

AI Technical Summary

Problems solved by technology

Eddy current testing is usually suitable for the outer surface of the measured object. Since the measured object is a ferromagnetic material, the skin depth of the eddy current is very low. According to the calculation formula of the eddy current skin depth, it is much smaller than the thickness of the pipe wall. For the pipe wall The accuracy of detection of outer defects is very low

Electromagnetic ultrasonic is a relatively new non-destructive testing method. Its advantage is that it can be tested without contact with the measured object, but it is easily disturbed by environmental factors.

Images