Coil structure for online residual magnetism elimination of ferromagnetic pipe and application thereof

Abstract

The invention provides a coil structure for online residual magnetism elimination of a ferromagnetic pipe, and the structure comprises basic rings and connecting rings; the connecting rings are connected to interfaces of two adjacent basic rings, and coils suitable for different pipe diameters are formed by selecting the lengths of the connecting rings and connecting the connecting rings. Meanwhile, the invention provides an application of the coil structure in a demagnetization method: the basic rings are arranged on the pipelines in a sleeving mode in advance, the basic rings are connected into a spiral coil through the connecting rings, the connecting rings with different lengths are adopted for winding the pipelines with different diameters, and then the pipelines are demagnetized. According to the invention, an original coil to be wound is changed into a split form, so the coil is prevented from being wound on a long and heavy pipeline; winding and dismounting of the spiral coil can be realized only through simple plugging; the basic rings and the connecting rings respectively have a length adjusting function, and one set of device can adapt to detection of different pipe diameters; the basic rings are provided with interfaces at different positions, and can be connected to different interfaces according to the pipe diameter.

Description

technical field [0001] The invention belongs to the technical field of pressure pipelines, and in particular relates to a coil structure for on-line elimination of residual magnetism in ferromagnetic pipelines and its application. Background technique [0002] During the production of long-distance oil and gas transmission pressure pipelines, due to factors such as the base material and steel pipe production process, residual magnetism may be generated at both ends of the pipeline; Various internal and external detection methods also lead to magnetism in the pipeline; oil and gas transmission pressure pipelines need to carry out various operations and monitoring during service. Lead to the magnetization of the pipeline; non-destructive testing such as magnetic flux leakage testing, eddy current testing, and magnetic particle testing of the pipeline will cause the magnetization of the pipeline and leave a residual magnetic field on the pipe wall. [0003] The residual magnet...

AI Technical Summary

Problems solved by technology

[0009] At present, there is no description or report of the similar technology of the present invention, and no similar data at home and abroad have been collected yet.

Images