The standard means for gas expense measurement. The extension of the Flowmeter Park, fitting it with the new high accurate devices, that can perform different measurements with the error under 0,5. Under this condition the additional system should be created for metrological service, that includes stationary and movable means of measurement accuracy.
For the standard measurements of gas expense the wide extension mechanical and gas dynamical method. The mechanical method is based on the displacement of the gas from the calibrated volume or on the base of the weighting of the gas quantity that goes into the volume per some time period. The application of some technical devices together with original engineering solutions premises to obtain good metrological characteristics.
But mass application of such devices is bounded because of the construction complexity. In some cases it is an inability to introduce them in the technological processes. The more perspective in this case are the gas dynamical methods of gas expense measurements. Their aim is to transform the potential energy of the flow into kinematical with the following measurement of the energy step скачок энергии and thermodynamic environment parameters.
Gas dynamic method is performed on the practice by the critical flowmeter, and also by the alternating voltage drop devices, that have got the great application due to simplicity of constructions, manufacturing and exploitation. Nevertheless this simplicity of the standardized forms of restriction devices defined their imperfection in the gas dynamical case that is reflected in the presence of domains with immediate motion and extension of the flow and most pressure gradients in the selection places.
List of the given data Basic data 1 Pipeline 1. Internal diameter Measured environment compressed air, then the available speed of the substance in the pipeline can be found using the following dimensions, then 2. Material 12Х13. We will approximate the found value of to the nearer standard value 200mm 3. Average expense. Minimal expense . 4. Available pressure drop, kPa. Average temperature, С . Relative humidity . 5. Average excessive pressure.