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By Iuliana Ratnakar 09 Oct, 2017

Being the supplier of a vast range of fluid monitoring and measurement equipment, Energoflow AG can also design Integrated Metering and Monitoring Systems (IMMS) tailor made for your requirements. The purpose of such a system is to collect process data from various remotely located sites and provide access to the consolidated data for analysis to authorized users.

By Iuliana Ratnakar 15 Sep, 2017

Ultrasonic flow meters use sound waves to determine the velocity of a fluid flowing in a pipe. At no flow conditions, the frequencies of an ultrasonic wave transmitted into a pipe and its reflections from the fluid are the same. Under flowing conditions, the frequency of the reflected wave is different due to the Doppler effect. When the fluid moves faster, the frequency shift increases linearly. The transmitter processes signals from the transmitted wave and its reflections to determine the flow rate.

Transit time ultrasonic flow meters send and receive ultrasonic waves between transducers in both the upstream and downstream directions in the pipe. At no flow conditions, it takes the same time to travel upstream and downstream between the transducers. Under flowing conditions, the upstream wave will travel slower and take more time than the (faster) downstream wave. When the fluid moves faster, the difference between the upstream and downstream times increases. The transmitter processes upstream and downstream times to determine the flow rate.

Transit time ultrasonic flow meters are usually more accurate than Doppler ultrasonic flow meters. Doppler ultrasonic flow meters are usually more economical.

By Iuliana Ratnakar 09 Jun, 2016

 The present study aims to analyze trends and prospects for the development of measurement technologies of natural gas metering by the example of ultrasonic flow meters (USM). International regulatory documents in the context of the USM classification depending on their accuracy class have been analyzed. The actual issues of USM verification and calibration have been studied. The USM technology enabling to confirm metrological parameters under operating conditions after calibration on air at atmospheric pressure has been presented.

 With increasing requirements for measurement accuracy in custody transfer of natural gas, initial calibration and subsequent verification of measuring instruments in the environment as close as possible to the operating conditions is the most arguable issue among professionals.

 As of today, due to the functional advantages, accuracy and reliability in operation, these are ultrasonic gas meters (USMs) that have become an integral part of modern measuring units for custody transfer of natural gas.

 Analysis of the main international regulations and industry standards demonstrates the lack of a unified requirement approach to the definition of working medium and pressure when implementing calibration and subsequent verification (recalibration) of USMs [1-4]. Depending on the accuracy class of meters and parameters of the working environment, recommendations for testing, calibration and verification of ultrasonic meters has been outlined. At the same time, classification of the meters depending on the maximum permissible error (MPE) has been defined (Table 1).

By Iuliana Ratnakar 09 Oct, 2017

Being the supplier of a vast range of fluid monitoring and measurement equipment, Energoflow AG can also design Integrated Metering and Monitoring Systems (IMMS) tailor made for your requirements. The purpose of such a system is to collect process data from various remotely located sites and provide access to the consolidated data for analysis to authorized users.

By Iuliana Ratnakar 15 Sep, 2017

Ultrasonic flow meters use sound waves to determine the velocity of a fluid flowing in a pipe. At no flow conditions, the frequencies of an ultrasonic wave transmitted into a pipe and its reflections from the fluid are the same. Under flowing conditions, the frequency of the reflected wave is different due to the Doppler effect. When the fluid moves faster, the frequency shift increases linearly. The transmitter processes signals from the transmitted wave and its reflections to determine the flow rate.

Transit time ultrasonic flow meters send and receive ultrasonic waves between transducers in both the upstream and downstream directions in the pipe. At no flow conditions, it takes the same time to travel upstream and downstream between the transducers. Under flowing conditions, the upstream wave will travel slower and take more time than the (faster) downstream wave. When the fluid moves faster, the difference between the upstream and downstream times increases. The transmitter processes upstream and downstream times to determine the flow rate.

Transit time ultrasonic flow meters are usually more accurate than Doppler ultrasonic flow meters. Doppler ultrasonic flow meters are usually more economical.

By Iuliana Ratnakar 09 Jun, 2016

 The present study aims to analyze trends and prospects for the development of measurement technologies of natural gas metering by the example of ultrasonic flow meters (USM). International regulatory documents in the context of the USM classification depending on their accuracy class have been analyzed. The actual issues of USM verification and calibration have been studied. The USM technology enabling to confirm metrological parameters under operating conditions after calibration on air at atmospheric pressure has been presented.

 With increasing requirements for measurement accuracy in custody transfer of natural gas, initial calibration and subsequent verification of measuring instruments in the environment as close as possible to the operating conditions is the most arguable issue among professionals.

 As of today, due to the functional advantages, accuracy and reliability in operation, these are ultrasonic gas meters (USMs) that have become an integral part of modern measuring units for custody transfer of natural gas.

 Analysis of the main international regulations and industry standards demonstrates the lack of a unified requirement approach to the definition of working medium and pressure when implementing calibration and subsequent verification (recalibration) of USMs [1-4]. Depending on the accuracy class of meters and parameters of the working environment, recommendations for testing, calibration and verification of ultrasonic meters has been outlined. At the same time, classification of the meters depending on the maximum permissible error (MPE) has been defined (Table 1).

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