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1. 发明授权

US4404843A Cryogenic storage tank leak detection system 失效
标题翻译：低温储罐泄漏检测系统
公开(公告)号：US4404843A
公开(公告)日：1983-09-20
申请号：US284756
申请日：1981-07-20
申请人： Irvin D. Johnson , Gary M. Timlin , Robert D. Yuill
发明人： Irvin D. Johnson , Gary M. Timlin , Robert D. Yuill
IPC分类号： F17C13/02 , F17C13/12 , G01M3/04 , G01M3/20 , G01M3/22 , G01M3/28 , G01M3/32
CPC分类号： G01M3/226 , F17C13/126 , G01M3/32 , G01M3/3236 , F17C2201/0157 , F17C2201/052 , F17C2203/03 , F17C2205/013 , F17C2223/0161 , F17C2250/0443 , F17C2260/038 , F17C2270/0105
摘要： The invention provides a system for the detection of leaks in the primary barrier (150), the secondary barrier (130), and the inner hull (110) of the primary and secondary insulation spaces (140 and 120) of a cryogenic cargo tank (10) carrying liquified natural gas in a transport ship (20) wherein an inert gas is maintained at a first predetermined pressure (P.sub.NP) in the primary insulation space (140) which is less than the pressure of the cargo gas (P.sub.CH.sbsb.2) and wherein the inert gas is maintained at a second predetermined pressure (P.sub.NS) in the secondary insulation space (120) so that the second predetermined pressure (P.sub.S) is less than the first predetermined pressure (P.sub.NP) and is also less than atmospheric pressure (P.sub.O). A gas sensor (930) is placed in the primary insulation space (140) to detect any leaks in the primary barrier (150) and a sensor (940) is placed in the secondary insulation space (120) to detect the presence of any oxygen due to a leak in the hull (110). The flow of the inert gas into and out from both the primary and secondary spaces (140 and 120) over a period of time is measured and any differences in the flow rates in and the flow rates out of each of the insulation spaces is detected. Any differences in the flow rates is indicative of a leak occurring in the secondary barrier and is further indicative of the size of the leak.
摘要翻译：本发明提供一种用于检测低温货舱的主要和次要隔离空间（140和120）的主要隔离物（150），次级隔离物（130）和内部船体（110）中的泄漏的系统（ 10）在运输船（20）中运送液化天然气，其中惰性气体在初级绝热空间（140）中保持在低于货物气体（PCH2）的压力的第一预定压力（PNP）），并且其中惰性气体在第二绝缘空间（120）中保持在第二预定压力（PNS），使得第二预定压力（PS）小于第一预定压力（PNP），并且还小于大气压（PO）。气体传感器（930）被放置在主绝缘空间（140）中以检测主阻挡层（150）中的任何泄漏，并且传感器（940）被放置在次级绝缘空间（120）中以检测是否存在任何氧气由于船体（110）的泄漏。测量惰性气体在一段时间内进入和离开主空间（140和120）的流量，并且检测每个绝缘空间中的流速和流速之间的任何差异。流量中的任何差异表示在次级屏障中发生泄漏，并进一步指示泄漏的大小。

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