10.14489/td.2015.04.pp.041-052

2015, 04 April

DOI: 10.14489/td.2015.04.pp.041-052

Kovalenko A.N., Artemiev I.B.
INTERNAL INSPECTION OF FLOW COATING PIPELINES
(pp. 41-52)

Abstract. The method of magnetic flux leakage (MFL) is widely used in running pipelines to detect the internal and external corrosion. The special testing device (flaw detector), designed on the basis of MFL method, provides magnetization of ferromagnetic material of the pipe wall. After that the magnetic flux leakage can be recorded by Hall-effect sensors. The defects in the pipe wall are detected on the basis of information received from the Hall-effect sensors. The metal brushes, so called distance keeping elements, are used in order to enter the magnetic field inside the pipe wall and to reduce magnetic field leakage in the air gap. As the energy-saving technologies are applied in pipeline transportation, the special pipes with internal flow coating are used now in pipeline construction. According to the calculations this coating reduces power consumption for gas transportation by 10…15 %. Such technologies were used for gas piping in Gryazovets–Vyborg area and for pipe laying on the seabed of the Baltic Sea, known as the North stream. The application of the flow coating pipes led to the necessity to develop and produce the new tools for internal non-destructive testing, which should not damage the internal pipe coating during testing. In order to keep the internal coating safe and sound, the metal parts of flaw detector should not contact or influence the internal flow coating of pipes. All the parts of the flaw detector, which are in direct contact with the internal flow coating of pipes and when they slide in it, they should be made of polyurethane with Shore hardness of 90 units. The design of flaw detector should not cause chips and scratches on the surface of the internal flow coating. The article describes the issues of development of internal flaw detector, that is the device of longitudinal magnetization, for detection of corrosion and transverse defects, such as ”cracks”, in the walls and weld transverse seams of gas and oil pipelines with internal flow coating, the wall thickness is up to 41 mm and the working pressure is up to 25 MPa.

Keywords: magnetic flaw detector, longitudinal magnetization, flow coating, base metal defects of pipes, weld defects.

+ - About the Authors Click to collapse

A. N. Kovalenko, I. B. Artemyev
JCS RII MSIA “Spectrum”, Moscow, Russia. E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

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