System for surveying fluid transmission pipelines and the like
Номер патента: CA1286772C
Опубликовано: 23-07-1991
Автор(ы): Pedro F. Lara
Принадлежит: Atlantic Richfield Co
Опубликовано: 23-07-1991
Автор(ы): Pedro F. Lara
Принадлежит: Atlantic Richfield Co
Реферат: ABSTRACT OF THE DISCLOSURE A pipeline survey pig including an onboard iner-tial reference unit and signal processing units for receiving acceleration and angular velocity signals generated by the inertial reference unit, calculating resultant values of angular velocity and accelerations and averaging the calculated values to provide record able signals related to the position of the pig and changes in curvature of the pipe. The pig is supported by a plurality of resilient cup shape support members which have a stiffness characteristic whereby the natural frequency of vibration which may cause lateral excursions of the pig is less than the signal generat-ing rate yet greater than the frequency of the signal to be measured. The center of stiffness and the center of gravity of the pig are disposed along the central axis of the pig and the pipeline section being measured and are preferably coincident with each other. The inertial reference unit includes three accelerometers and three gyroscopes oriented orthogonally and may have their axes oriented to intersect at the center of gravity and center of stiffness.
Multiplex pipe and system for recovering steam from geothermal wells
Номер патента: PH12015500340B1. Автор: Kazuhiro Takahashi,Akira Kawakami,Hideki Fujii,Masayuki Igarashi,Keita Suzumura,Akihiro Itoh,Teruhiko Hayashi. Владелец: Nippon Steel And Sumikin Eng Co Ltd. Дата публикации: 2015-04-20.