GR flowmeter | Convert natural gas operating volume to standard operating volume

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What is the density of natural gas and oil under standard conditions? Under standard conditions, the air density is 1.205, while the relative density of natural gas is generally between 0.58 and 0.62, as the composition of different gas sources may vary. If you multiply the two, the formula for converting natural gas density and standard condition volume is different from that for ordinary gases, and must comply with the standard SY/T6143-1996 issued by China National Petroleum Corporation. The gas equation Qn=Zn/Zg • (Pg+Pa)/Pn • Tn/Tg • Qg, where: Qn - volumetric flow rate under standard conditions (Nm3/h) Zn - compression coefficient under standard conditions Zg - compression coefficient under working conditions Pg - gauge pressure (KPa) Pa - local atmospheric pressure (KPa) Pn - standard atmospheric pressure (101.325KPa) Tn - absolute temperature under standard conditions (293.15K) Tg - absolute temperature of the medium (273.15+t) Kt - Celsius temperature of the measured medium (℃) Qg - uncorrected volumetric flow rate (m3/h) Note: For natural gas, Zn/Zg=Fzk 2. Fz is referred to as the over compression factor, calculated according to the formula in the standard SY/T6143-1996 of China National Petroleum Corporation. If users need to adjust the compression factor of natural gas flow, they should provide the following data: the true relative density of natural gas (0.550 ≤ Gr ≤ 0.750), the mole fraction of carbon dioxide in natural gas (Mc ≤ 0.15), the mole fraction of nitrogen in natural gas (Mn ≤ 0.15), and the determination of the true relative density Gr of natural gas. The true relative density Gr of natural gas is defined as the ratio of natural gas density to dry air density under the same state, where Gr is the true relative density under standard conditions, and its value is calculated according to the following formula: Gr=Za/Zn * Gi...... Calculate according to formula

(2); Za - the compression factor of dry air under standard conditions, with a value of 0; Zn - compressibility factor of natural gas under standard conditions, calculated according to formula

(3). Gi=∑ J=1nXjGij...... (2): Xj - the mole fraction of the j component in natural gas, given by gas analysis; Gij - the ideal relative density of natural gas component j, obtained from the appendix; N - Total number of natural gas components, provided by gas analysis. Zn=1- (∑ J=1nXj √ bj) 2+0.0005 (2XH-XH2)...... (3) In the equation: √ bj - the summation factor of the j component content in natural gas, which can be found in the appendix; XH - Molar type acre coefficient of hydrogen content in natural gas, provided by gas analysis. This formula is also suitable for volume conversion of differential pressure flow meters and gas ultrasonic flow meters under standard conditions.

2. Conversion of natural gas operating condition volume to standard condition volume

If the conversion formula for natural gas standard condition volume is different from that for ordinary gas, it must comply with the standard SY/T6143-1996 issued by China National Petroleum Corporation.

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