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Natural gas flow calculation example

Natural gas flow calculation example The orifice plate diameter is designed and calculated to meet the given working conditions. This example is calculated according to the angle connection and the pressure is similar.
(1) Known conditions
1 Measuring tube inner diameter: D20 = 259. 38mm (new seamless tube of No. 20 steel)
2 air flow commonly used: g. . -8. 14m3ls; maximum flow: q. K_11. 25 m3ls; minimum flow: g. X-
4. 00nl3lS.
3 common air temperature: t-15 ° C
4 common differential pressure of airflow: Ap=12500Pa
5 air flow common table static pressure: Pi = 1. 48MPa
6 local atmospheric pressure: township. 0. 0981MPa
The throttling device has been tested to comply with the relevant technical regulations of the SYlT 6143 1996 standard.
7 Differential pressure gauge, pressure gauge and thermometer with 1 degree accuracy: differential pressure gauge upper limit is 25000Pa; pressure gauge engraved
The upper limit of the degree is 2. 50MPa; the upper limit of the thermometer scale is 100 °C
8 natural gas components:
┃ mole fraction ┃ 0. 8682 ┃ 0. 0625 ┃ 0. 0238 ┃ 0.0072 ┃ 0.0064 ┃ 0. 0025 ┃ 0.0034 ┃ 0. 0027┃ 0.0004 ┃ 0. 0004┃ 0.0068 ┃ 0. 0157 ┃
(2) Auxiliary calculation
1 Find the diameter D of the measuring tube. The value of D is obtained by the equation (A3).
D=259. 38×[1+1. 116X10_5×(15 20)]
=259. 37mm
2 Find the relative density of natural gas G,. According to Al.2
Gr-Gi

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