دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a device fitted on the vertical support members of the Trans-Alaska Pipeline System (TAPS) to circulate a refrigerant continuously between the subsoil and the top of the pipe. The refrigerant keeps the ground beneath the pipeline frozen to prevent frost heaving.

n: movement of the soil resulting from alternate thawing and freezing. Frost heaving generates stress on vertical support members of pipelines in the Arctic and, by extension, on the pipe itself.

n: in pipeline construction, the process of raising pipe and placing it on vertical support members in parts of the world where frozen earth prevents normal burial of the line. Lowering-up is the counterpart of lowering-in in more temperate climates.

n: a special saddle, or cradle, that holds pipe on a vertical support member in the lowering-up type of pipe laying. The slide-and-guide allows longitudinal movement of the pipe caused by d1ermal expansion and contraction. See lowering-up.

n: (VSM) an Hshaped device that supports a pipeline above the ground. Vertical support members are used in parts of the world where frozen earth prevents normal burial of the line. See lowering-up.

abbr: vertical support member.