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    • 5. 发明授权
    • Slam prevention in liquid pumping
    • 液体泵送中的防弹
    • US4194870A
    • 1980-03-25
    • US887084
    • 1978-03-16
    • Edmund G. Tornay
    • Edmund G. Tornay
    • F04D15/00F17C13/12F04B15/08
    • F17C13/12F04D15/0077F17C2205/0332F17C2221/033F17C2223/0161F17C2223/033F17C2227/0135F17C2227/0178F17C2227/0192F17C2250/061F17C2270/0105Y10S417/901
    • Conventional installations for pumping of liquid LNG (liquefied natural gas) from a sealed tank of a marine vessel to a shore installation commonly include a pump immersed in the liquid, a riser pipe from the pump to a level above the liquid, a stop valve on the riser pipe outside the tank, and a connection to the header leading to the shore installation. With the stop valve closed, operation of the pump can cause slamming of the liquid, accelerating up the riser pipe, against the stop valve, to the extent that the valve or piping may be damaged or destroyed. The invention provides a method of operation, and apparatus to permit it to be carried out, whereby a pocket of non-liquefiable gas is formed in the riser pipe above the liquid level so that, upon operation of the pump with the stop valve closed, although LNG vapor in the riser pipe may become compressed to liquid, the pocket of gas remains to act as a compressible buffer between the rising liquid and the stop valve.
    • 液体LNG(液化天然气)从船舶的密封罐泵送到岸上的常规装置通常包括浸在液体中的泵,从泵的提升管到液体上方的停止阀, 坦克外面的提升管,以及通向岸上安装的通道的连接。 在关闭截止阀的情况下,泵的操作可能引起液体砰击,使提升管加速上止动阀,直到阀或管道可能被损坏或破坏。 本发明提供了一种操作方法和允许其执行的装置,由此在提升管中在液面上方形成不可液化气体的口袋,使得在具有截止阀的泵的操作时, 尽管提升管中的LNG蒸汽可能被压缩成液体,但气体袋仍然保持在上升液体和止回阀之间的可压缩缓冲器。