Calibration of Water Meters Is important For Flow Measurement

Posted by h2bid on March 7th, 2017

Flow measurement is helpful in measuring the flow of water in water plants as well as metering of household water. Accurate measurement is vital in all scenarios for the sake of safety, security, revenue in case of water plants and the homeowner always wants to be charged correctly. Global weather affects the water supplies; hence water measurement is essential for conservation plans.

Flow meters are calibrated for the sake of defensible accuracy. In the petroleum industry, the flow meters are calibrated every day. There are scenarios where the meters are never taken out of service during the life of the meter. Below are the benefits of flow meter calibration-

• The Calibration Instruments Must Show Traceability To Higher Level Measurements

Gravimetric method is used for the calibration of large-scale flows. Use of scales, timers and temperature measurement is brought into use so as to determine the flow through the meter that is under test.

• Uncertainty Is The Term Used To Express The Accuracy Of Calibration Result

During the calibration process uncertainty valve is provided to each measurement that is based on manufacturer’s data, instrument calibration data, and laboratory experience. To provide a confidence level in the flow measurement result the individual measurement uncertainties are combined together.

• Accreditation of The Laboratories

Consumers who seek meter calibration are provided with meter accreditation ensuring that the laboratory has been independently evaluated while demonstrating competence in the field. Internationally recognized standards of laboratory accreditation are practiced.

• Meter Calibration Should Be Performed Using Fluid Properties

Water temperature, operating pressure, density, and Reynolds number effects the interaction between the flow meter and the water. Hence it is essential to understand the fluid properties of water at operating and calibrating levels so as to provide useful calibration data.

• The Conditions of Meter Installation Should be simulated

The purpose of meter installation is to provide perfect piping conditions upstream and downstream of the meter. There is need of fully developed velocity profile where the flow enters the meter. All this is dependent on Reynolds number, pipe roughness, pipe diameter, and the length of the pipe. The cost of meter calibration is determined by the function of meter diameter that would have a predefined number of data points and taps.

Water is an important natural resource; hence its measurement is essential for determining the operational efficiency of power plants. This may also help in conserving supplies of drinking water.

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