Measurement of natural gas flow

Measurement of natural gas flow The development trend and main methods of natural gas measurement At present, international natural gas trade measurement is divided into three types: volumetric measurement, mass measurement and energy measurement. Both mass measurement and energy measurement are used in industrially developed countries. my country's natural gas trade measurement is based on volume or energy under the legally required quality indicators. At present, it is basically based on volume and 1^/3, and the unit of volume flow 1 flow in working state is ^1/5. For the orifice flowmeter, if the sample gas of the online density meter is taken from the upstream pressure-taking hole, and the sample flow enters the online density meter, it should flow in at a particularly low flow rate, and ensure that it has no effect on the measurement of pressure and differential pressure. . For flowmeters other than rotary volumetric flowmeters, the online density meter should be installed downstream of the flowmeter to avoid disturbing the flowmeter population velocity distribution. The connecting pipeline from the sampling port to the online density meter should be as short as possible, and the connecting parts and pipelines should be insulated to reduce the influence of ambient temperature on the sampling gas. In order to ensure that the density value measured by the online density meter is the same as the density value flowing through the flowmeter, the exposed part of the density sensor and the upstream and downstream pipelines of appropriate length of the flowmeter should be insulated. The online density meter should measure the temperature of the sample gas. When the temperature of the sample gas is different from the temperature of the natural gas in the main pipeline, the correction value should be used to compensate.

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