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Method and apparatus for detecting leaks in the ullage of a liquid storage tank

机译:用于检测储液罐余量中的泄漏的方法和设备

摘要

Apparatus and method for detecting leaks within underground or aboveground tanks and their associated piping whether the tank and/or piping is partially filled or empty. The apparatus is partially insulated to minimize temperature effects when injecting a test gas into the tank to be tested. The tank is pressurized to a fill pressure by injecting (bubbling) the test gas through any liquid in the tank. Once stabilized the pressure is reduced to a test pressure while the gas injection continues. The flow rate of gas into the tank is monitored by a flow meter able to measure small flows while the pressure is held constant by a pressure regulator having a high accuracy and the temperature of the ullage is monitored. A tight or leaking tank is determined by evaluating the flow rate of constant pressure against reference criteria which when met identify a tight tank and when not met identify a leaking tank under EPA guidelines. Temperature, deflection, and other effects on leak rate detection are compensated for by prescribing waiting periods, filling times, and multiple and repeat threshold exceedance criteria. Flow rate, temperature and pressure can be reached manually or fed to a suitable computer or chart recorders for permanent records and/or automated testing.
机译:用于检测地下或地上储罐及其相关管道中的泄漏的设备和方法,无论储罐和/或管道是否已部分填充或为空。该设备是部分绝缘的,以在将测试气体注入要测试的储罐时将温度影响降至最低。通过将测试气体通过储罐中的任何液体注入(鼓泡),将储罐加压至填充压力。一旦稳定,在继续注入气体的同时将压力降低到测试压力。通过能够测量小流量的流量计来监测进入罐中的气体的流量,同时通过具有高精度的压力调节器将压力保持恒定,并监测料位的温度。通过参照参考标准评估恒定压力的流量来确定密闭或泄漏的储罐,在满足标准的情况下,根据EPA准则确定密闭的储罐,在不满足标准的情况下识别出泄漏的储罐。通过规定等待时间,填充时间以及多个和重复阈值超出标准,可以补偿温度,挠度和其他对泄漏率检测的影响。流量,温度和压力可以手动达到,也可以馈入合适的计算机或图表记录器进行永久记录和/或自动测试。

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