An overreading model for nonstandard Venturi meters based on H correction factor

• We developed a wet gas overreading model for nonstandard Venturi meters.
• H correction factor is a key parameter in our model.
• The effect of gas Froude number, beta ratio and throat length on overreading.
• Laboratory experiments was conducted to validate the model.
• Comparing with de Leeuw model was used to study the extrapolation of this model.

The objective of this study is to develop a wet gas overreading model for nonstandard Venturi meters. This overreading model was proposed based on a new characteristic parameter, H correction factor, which took into account the effect of gas densiometric Froude number, beta ratio and throat length on overreading. Four nonstandard DN-80 Venturi meters with different beta ratio and throat length was designed for laboratory experiments that conducted in Tianjin University (TJU) low-pressure wet gas test loop and validate the model. The experimental results showed that this correlation gave a good prediction to the overreading of the four nonstandard Venturi meters with a prediction error of ±4% and an uncertainty of better than ±2.5%. It was used to predict the gas flow rates of the Venturi tube used in de Leeuw correlation. The relative bias is ±4% between this model and the de Leeuw correlation.