2014, 05 май (May) | ||
DOI: 10.14489/td.2014.05.pp.060-066 Гуськов С.С., Агиней Р.В., Мусонов В.В., Спиридович Е.А. Аннотация. Представлены результаты дистанционного магнитометрического обследования участка подземного трубопровода при наличии и отсутствии избыточного внутреннего давления газа. При анализе характера изменения магнитного поля использована информация о расположении кольцевых сварных швов, полученная в ходе диагностического обследования рассматриваемого участка. Обнаружена взаимосвязь между величиной изменения поля и типом труб. Ключевые слова: дистанционная магнитометрическая диагностика, подземный трубопровод, внутреннее давление.
Guskov S.S., Aginey R.V., Musonov V.V., Spiridovich E.A. Abstract. The results of experiments on influence determination of change of mechanical stresses in the pipeline on a magnetic field, created by the pipeline on a ground surface, are presented. The remote magnetometric survey of an operating underground gas pipeline section of a large diameter was executed in the presence and in the absence of an excess internal gas pressure. There were estimated nature and value of change of the magnetic field, caused by known change of mechanical stresses. At analyzing a magnetic field behavior, the information of circumferential welds’ location was used, obtained in the course of diagnostic study of the concerned pipeline section. It is established that at change of mechanical stresses in pipeline the character of distribution of the pipeline magnetic field on a ground surface essentially changes. At 275 МPa change of circumferential stresses and 100 МPa of longitudinal stresses, changes of a magnetic field strength vertical component of ~ 13 А/m were observed in a number of points at a ground surface, remote at a distance of 1,9 m from the pipeline axis. Thus the average variation value of the vertical component at section with the length of 1700 m has made only ~ 1 А/m. The interaction between statistical characteristics of change of magnetic field strength components at change of mechanical stresses and pipes type is found out. The root-mean-square deviation of variation of a vertical strength component has made 1,46 А/m at the sections, consisted of single-joint welded pipes, 2,59 А/m at the sections, consisted of spiral-welded pipes, 3,41 А/m at the sections, consisted of double-seam pipes. It is shown that both in the presence, and in the absence of excess internal pressure the changes of strength component of magnetic field along pipeline axis are connected with differences of longitudinal magnetization of the neighboring pipes. Therefore some circumferential welds can be defined by magnetograms. It is established that at change of underground pipeline’s deflected mode, the character of a magnetic field variation on a ground surface depends not only on mechanical stresses, arising at present moment, but also is substantially determined by magnetic background of pipes which for different pipes can essentially differ. Keywords: remote magnetometric diagnostics, underground pipeline, internal pressure.
РусС. С. Гуськов, Р. В. Агиней, В. В. Мусонов, Е. А. Спиридович (ОАО «Гипрогазцентр», Нижний Новгород) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. EngS. S. Guskov, R. V. Aginey, V. V. Musonov, E. A. Spiridovich (JSC «Giprogazcentr», Nizhniy Novgorod) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.
Рус1. Крапивский Е. И., Некучаев В. О. Дистанционная магнитометрия газонефтепроводов: учебное пособие. Ухта: УГТУ, 2011. 141 с. Eng1. Krapivskii E. I., Nekuchaev V. O. (2011). Remote magnetometry of the pipelines: textbook. Ukhta: UGTU.
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