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|Type:||Artigo de evento|
|Title:||A Novel Technique To Pressure Vessels Monitoring|
|Abstract:||Pressure vessels are important equipment in the chemical industry as they store gases, liquids and other fluids at high pressure. A small leakage on them can be very dangerous, generating pollution, explosion and also financial losses to the industry. For those reasons, it is essential to have a fast and efficient leakage detection system. In this work a novel technique has been developed to monitoring pressure vessels. The monitoring system consisted of a transducer and a microphone. The transducer was used to monitoring the variation in pressure and the microphone was used to catch the noise generated by leakages. This work describes a gas leak detection technique based on the analysis of pressure and noise generated by the leaks in pressure vessel. An experimental rig was set up using a 37.5 liters pressure vessel, fitted with a system to simulate sudden leakage through small orifices. The pressure in the vessel varied between 1 and 7 kgf/cm2 and it was monitored through a transducer. Leakage was simulated through a valve fitted with an orifice which size was varied between 0.1 and 2.0 mm in diameter. An electric circuit was developed to process the noise generated by the leakage. This noise was captured by a microphone and sent to the signal processing circuit that had two different stages. On the first stage the signal was only amplified and on the second one, the signal was filtered through three band pass filters, centered in 1 kHz, 5 kHz and 9 kHz each one, generating three continuous signals in different frequencies. Pressure and noise data were obtained on-line, and a program was developed to process all the information. Experiments were carried out operating the pressure vessel either with a batch of gas or with a continuous gas feed. The experimental results show that it is possible to detect leaks based on the leak sound. The analysis of the signal amplitude for different frequencies shows that the leakage noise signal changes with the leakage size and pressure in the vessel. The developed system shows to be a very reliable tool for safety supervision of pressure vessels.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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