Leak detection by monitoring pressure to preserve integrity of agricultural pipe
Leak detection by monitoring pressure to preserve integrity of agricultural pipe
复制标题
通过监测压力进行泄漏检测，以保持农业管道的完整性
DOI：
10.1007/s10333-019-00730-5
复制
发表时间：
2019
影响因子：
2.2
通讯作者：
Naritaka KUBO
中科院分区：
文献类型：
--
作者：
Yohei ASADA ; Masaomi KIMURA ; Issaku AZECHI ; Toshiaki IIDA ; Naritaka KUBO
农用管道由于腐蚀、接头松动、裂缝等原因造成的渗漏问题日益频繁，严重时会造成周边道路和居民点地面沉降。一般来说，通过在24小时内监听噪声泄漏信号或测量由阀门关闭的部分中的水损失来检测泄漏。但这些方法都有缺点：它们成本高，不准确，而且耗时。本研究探讨一种新的泄漏检测方法，是准确和容易完成的监测压力，以防止破坏的管道。在瞬态事件期间，其中大的压力波由急剧的阀关闭突然产生，压力波衰减，并且当通过泄漏点时，衰减波被反射。提出了两种将泄漏传播特性应用于管道泄漏检测的方法：第一种方法是通过阅读泄漏点的反射波信号来估计泄漏点的位置和泄漏量，并通过实验验证了该方法在泄漏量与管道流量之比大于5%时的有效性。在第二种方法中，其重点是由于泄漏引起的压力阻尼，在第一种方法不能检测到泄漏的情况下，通过使用特征方法将计算的“阻尼率”拟合到测量的“阻尼率”，可以以小于总管道长度的5%的精度估计泄漏位置。
Leakage of agricultural pipes has been increasingly frequent problems due to corrosion, loosening of joints, and cracks, which result in the subsidence of peripheral roads and dwelling land in the worst case. Generally, leakage has been detected by listening for noisy leak signals or measuring water loss during 24 h in a section closed by a valve. But these methods have weak points: They are costly, inaccurate, and time-consuming. This study investigated a new method of leakage detection that is accurate and easily accomplished by monitoring pressure for the purpose of preventing the destruction of pipes. During a transient event, where a large pressure wave is generated suddenly by sharp valve closure, the pressure wave damps out and the reduction wave is reflected when passing through a leakage point. Applying the propagation characteristics to leak detection, two methods were proposed: In the first method, a location and leakage volume was estimated by reading the signal of reflected wave from the leakage point and the validity of the method was confirmed by experiment in case that the ratio of leakage volume to flow rate in the pipe was more than approximately 5%. In the second method, which focuses on damping of pressure due to leakage, the leakage location could be estimated with an accuracy of < 5% of the total pipe length by fitting the calculated “damping rate” to the measured “damping rate” using method of characteristics in the cases where the leakage could not be detected by the first method.