Device scheme of high pressure loop gas flow standard device
In order to solve the problem of high pressure flowmeter verification error in normal pressure state,a design scheme for developing annular high pressure gas flow standard device is put for-ward.According to the characteristics and measuring principle of the device,the measuring methods of positive pressure and standard table are determined,and the overall scheme of the device is determined according to JJG 643-2003.According to the characteristics of high pressure environment,the key me-chanical structure of the device is optimized.Through mathematical model,the measuring mode of"ab-solute pressure+differential pressure"is designed.According to the actual work site,the pipeline layout and valves are optimized.The overall device can achieve the maximum pipe diameter DN300,the pres-sure range(0.4～4.0)MPa,the flow range(16～7 500)m3/h,and the extended uncertainty of 0.33％(k=2)detection capability.
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