Pipe leakage diagnosis system, device and method

Abstract

The invention provides a diagnosis system, a diagnosis device and a diagnosis method for pipe leaking. The system comprises a pressure sensing device, which is arranged on a pipe to be diagnosed and used to pick up a negative pressure wave signal of leaking in the pipe, a multi-task data acquisition device, at least two RAM of which are controlled by a control circuit to acquire the negative pressure signal and transmit the data acquired alternately, and a data processing device, which receives the data transmitted by the multi-task data acquisition device, analyzes the data and identifies the leaking. The invention settles the issue of identifying a signal of a small leakage with a pipe.

Description

technical field [0001] The invention relates to pipeline leakage diagnosis technology, in particular to a pipeline leakage diagnosis system, device and method. Background technique [0002] At present, pipeline transportation has become one of the five major transportation modes in my country. 15,000 kilometers of oil and gas pipelines have been built in my country. It is estimated that by 2010, the total length of crude oil, refined oil, and natural gas pipelines will increase to 80,000 to 100,000 kilometers. Pipeline leakage will cause serious consequences such as environmental pollution, combustion and explosion, and will cause great direct and indirect economic losses. The annual economic loss in my country is nearly 700 million yuan. There are more than 20 kinds of pipeline leakage diagnosis methods [3] , the most widely used is the negative pressure wave diagnosis method [4-6] , its principle is to realize the diagnosis of leakage by analyzing the pressure negative ...

AI Technical Summary

Problems solved by technology

However, the current negative pressure wave diagnosis method has a big problem that the minimum leakage can only be about 1%, and it is impossible to diagnose small leaks with a leakage of less than 1%.

[0003] The root cause of the inability to diagnose small leaks is: the data acquisition frequency and resolution of the diagnostic system are low, and the negative pressure wave signal of small leaks cannot be identified

[0004] Although the acquisition frequency of existing acquisition devices can reach very high, if some can reach 10MHz, the acquisition devices used for pipeline leakage diagnosis all adopt a "single-task serial diagnosis mechanism" (as shown in Figure 1). That is, according to the order of "signal collection→signal transmission→signal collection→", various functions are completed periodically. After the signal collection is completed, the signal must be transmitted to the computer before the next collection, which inevitably makes the collection frequency lower. (Generally 5HZ-20Hz), to ensure that there is enough time between two signal acquisitions for signal transmission, and the acquisition frequency of 5-20Hz can only identify >1% of the leakage negative pressure wave signal, which cannot be identified Produce <1% small leakage negative pressure wave signal

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