Description
The ultrasonic gas meter is one of the types of industrial gas meter is used in a wide range of industries and in different stations due to its many advantages over other gas meter. R&D unit of Gas Souzan industrial manufacturing Company, has localized parts of the production process, and launched its production line ,considering the extensive needs of the Iran’s oil, gas, refining, petrochemical industries and power plant for this gas meter, and then After accurate inspection by the experts of National Iranian Gas Company, it could register its brand in the a list of suppliers of the Ministry of Oil.
The method that industrial ultrasonic gas meter uses to measure gas is based on the transition time changes of the ultrasonic signal between a pair of transducers. In this method, the transducers are placed in front of each other and at a certain angle to the axis of the flow meter.
In the first stage, the first transducer sends an ultrasonic signal with a specific amplitude and frequency; The time interval between sending the signal and receiving it by the second transducer is measured and due to the fact that the signal transmission path is in the same direction as flow, it is called downward transit time.
In the next step, the same operation is repeated in the opposite direction, and the time interval between sending the signal from the second transducer and receiving it by the first transducer is called upward transit time. By an equation which figure below shows, the average velocity of the fluid in the flow meter cross-section can be calculated. In the case that the passing flow rate is zero, the upward and downward transit times of the signal are equal and therefore V will be zero. By changing the flow, the difference between these times changes according to the amount and direction of the flow.
The number of transducer paths for applications requiring high measurement precision, such as custody transfer, is chosen to be at least four due to unevenness of the fluid velocity profile in the pipe cross-section. Each path measures the velocity of fluid across a cross- section of flow meter and the final velocity is calculated as the weighted average of these velocities. The fluid flow is the average velocity multiplied by the cross-sectional area of the flow meter and the passing volume is the flow multiplied by the fluid transition time.
The advantages of the ultrasonic meter compared to the turbine meter:
- Two-way measurement capability
- High accuracy and repeatability of flow measurement
- Elimination of pressure drop during the flow of fluid through the meter
- The ability to measure with high accuracy in a wider range of flow rates
- Low maintenance and repair costs due to the elimination of mechanical and circular parts
- Variety of applications due to the high corrosion resistance of the parts in contact with the meter fluid
The advantages of ultrasonic gas meter manufactured by Gas Souzan company:
- By using a broadband continuous wave system in the SPU section, it increases safety against acoustic noises and reduces power consumption.
- Intrinsic safe design, which leads to the highest anti-explosion safety class and also the possibility of accessing the SPU boards in the dangerous environment.
- Having performance certificates based on AGA 9 and OIML R137 standards from the NMi – Netherlands measurement Institute and also registered in the list of suppliers of the Ministry of Petroleum.
- Low maintenance cost as well as maintaining the stability and accuracy of measurement at low flow rates due to the design of the meter based on the structure and number of optimal elements.
At present, this gas meter is manufactured in 3, 4, 6, 8, 10 and 12 inches and in pressure ratings: class 150, 300 and 600 and has been installed in various centers including steel and petrochemical plants, CGS stations.
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