Cylinder Pressure Measurement And Control System Research And Development

Hydrostatic test is one of the most direct and effective methods and means to check the gas cylinders. In this paper, Water jacket method and direct expansion method those are used to derermine volume permanent deformation rate of gas cylinders are compared synthetically. From the comparison, the conclusion is drawn that water jacket method is better than direct expansion method. Meanwhile, the paper makes great improvements on the current national hydrostatic tester with the concept of the signal measure and process control with computer. The main contents of this paper are as follows: I .A hydrostatic tester which is centered on signal measure and process control with computer is designed, A head which has reliable airproof capability and is easy to operate is designed. The type selecting, purchasing and installing of parts of the apparatus are fulfilled. 2.A set of Object Orient visible data collection software for Windows98 is designed with the VC+?.O, It can accomplish the pressure and volume deformation signal acquisition, display and disposal as well as temperature signal real time inspect and measure. The tester can carry out the following functions: (I) Having higher precision than the kind of it; Not only can it display the real-time pressure and volume deformation curves, but also store the curves in data document. (2) Fulfilling the autocontrol of pump; The valves have corresponding indicator lights to indicate their status. (3) Supervising the system's working status incessantly: It can give an alarm when the temperature supervised is beyond the allowed or when any leakage occurs. (4) Providing the communication and connection between the locale and controlling room. (5) Dealing with the result of test automatically. It can provide testimonial with both the graphs and the words as well as the WYSIWYG print effect. After this hydrostatic tester has been accessed by test, following conclusionis draw: lt has high reliability and efficiency and is easy to operate, Its precision issatisfied with the accuracy which is stipulated by national standard.