Abstract
There is a certain production and sales difference in the urban gas transmission and distribution system, which is composed of many factors. Part of the reason is that the gas meter takes the volume under standard conditions as the measurement unit, but the gas temperature and pressure in the meter change with the environment of the gas supply pipelines, resulting in the measurement error of the domestic gas meter without temperature and pressure compensation. By analyzing the change of annual gas temperature and local atmospheric pressure when outdoor courtyard pipelines are overhead and buried in a city, the influence of temperature and pressure change on gas volume is discussed by using gas state equation, the production and sales difference caused by metering error is calculated, and the corresponding correction coefficient is put forward, which is of certain significance to reduce the production and sales difference. It is concluded that when temperature of the gas is lower than 20°C, the measurement error of the gas meter is negative, which has caused the loss of the gas company. For domestic gas meters without temperature compensation, the product of measured gas consumption and temperature correction coefficient can be taken as the actual gas consumption to correct the measurement error of gas meters.
Highlights
In the process of gas sales, the standard condition volume is taken as the measurement unit
This paper considering the influence of local atmospheric pressure, gas supply pressure and gas temperature in the pipeline under different laying conditions on measurement error, taking J City as an example, analyzes and calculates the gas loss caused by measurement error
When the gas temperature is lower than 20°C, the gas meter counter shows that the gas consumption is less than the gas consumption converted into standard state, and the measurement error presents a negative difference, which will cause losses to the gas company, and the temperature correction coefficient is greater than 1; If the gas temperature is greater than 20°C, the gas consumption displayed by the counter of the gas meter is more than that converted into the standard state, and the measurement error is positive, causing losses to the gas user
Summary
In the process of gas sales, the standard condition volume is taken as the measurement unit. When there is a difference between the actual state and the measurement standard state and the gas meter does not have temperature and pressure compensation, the measurement error will be caused. Beijing gas group collects and analyzes the annual natural gas temperature, calculates that the annual measurement error caused by no temperature and pressure compensation is - 3.4% [3]. Reference [4] introduces two methods for evaluating the uncertainty of indication error of diaphragm gas meter. This paper considering the influence of local atmospheric pressure, gas supply pressure and gas temperature in the pipeline under different laying conditions on measurement error, taking J City as an example, analyzes and calculates the gas loss caused by measurement error
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