Assessment of a Random Error of Vortex Flow Meters in the Course of Their Operation

Summary

Methods of the assessment of a random error of vortex flow meters and water meters in the course of their operation are considered. This methodology is based on the statistical treatment of measurements of instantaneous values of vortex formation of the flow meter placed in the working pipeline. The scheme of connection of the vortex flow meter implemented in the submerged variant reducing the cost considerably and making it possible to use these instruments for measurement of a flow rate in large diameter pipelines and open canals is presented.

Key words

water meter , flow meter , pipeline , measurement error , methods of error assessment

Technical Support of verification of Water Meters and Flow Meters

Summary

Problems of the technical support of verification of instrumentation used in the municipal economy, water meters and flow meters to confirm their compliance with established standards of measuring accuracy are considered.

Key words:

water meter , flow meter , pouring inspection device , weighing method of inspection

Device of Proportional Dozing of Reagents for Water Supply Systems

Summary

Devices of the dozing of reagents (complexions) making it possible to reduce expenses for water treatment, reduce the rate of pipelines corrosion, remove salt sediments from inner surfaces of pipes and heat exchanging apparatuses are used widely in the last years at boilers, heat supply systems and hot water supply systems. Shortcomings of ejection and injection systems of reagents dozing are described. A device ensuring the permanent pressure control in a pipeline where dozing is carried out and limiting the maximum time between the introductions of regular dozes of reagent is proposed.

Key words:

salt sediments , water treatment unit , pressure drop , reagent , dozing pump , flow meter , injection systems