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    Gas injection arrangement for preventing pipeline slumping
    81.
    发明授权
    Gas injection arrangement for preventing pipeline slumping 失效
    用于防止管道流失的气体注入装置

    公开(公告)号：US3575469A

    公开(公告)日：1971-04-20

    申请号：US3575469D

    申请日：1969-04-11

    申请人： SHELL OIL CO

    发明人： MEYER FRANK L

    IPC分类号： B65G53/30 ,  F16L55/24

    CPC分类号： F16L55/24 ,  B65G53/30

    摘要： Method and apparatus for preventing downhill slumping in a shutdown slurry pipeline. Upon shutdown of the pipeline, a gas is injected into the line at selected locations to fluidize the solids, thereby preventing the formation of solid particle plugs in the low regions of the line. If insufficient gas is injected to fluidize the settling solids, a channel will be formed in the upper portion of the pipe which will enable flow and pressure transmission for resuspending the solids upon restart. The present invention relates to pipeline transport operations; and more particularly, to a method and apparatus for preventing the downward movement of slurry solids in an inclined portion of pipeline during a shutdown period and for the plugging of the pipeline by said solids particles. Transportation by pipeline is a major and growing industry. With the use thereof formerly confined almost entirely to movement of water, gas and petroleum products, pipelines, with the advent of slurry transport, have become useful for long and short hauls of a wide variety of raw materials and finished products. With respect to the pipeline transportation of materials in slurry form, problems may arise when such materials are moved through pipelines inclined to go over a hill or down into a valley of such inclination to cause slumping. At these locations, during a planned or emergency line shutdown, the solids of the transported slurry may settle out vertically and subsequently slump down the inclined portions of the pipeline, thereby causing a compacted plug which may be very difficult to dislodge and move when line shutdown is terminated and transport activities are attempted. These difficulties are most commonly avoided by laying solidscarrying or slurry pipelines so that they do not exceed a slope or angle of inclination below which slumping does not occur. Alternatively, the inclined pipeline sections are emptied or flushed of solids at each shutdown. Obviously, these alternative prior art approaches are not always feasible or economical, especially in those situations where long and relatively steep slopes are encountered. Slopes of this nature are being encountered with increasing frequency as pipeline operations are being extended to new relatively inaccessible mountainous areas in the United States and elsewhere.