Calculation formula for pipeline gas flow rate | Calculation of pipeline pressure, flow velocity, and flow rate, conversion of standard condition and operating condition flow rate

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1. Hourly gas flow rate of DN20 pipeline

The hourly gas flow rate of DN20 pipeline is not a fixed value, but depends on the gas type, pressure, temperature, and flow rate. Its inner diameter is usually 21.25mm, and the cross-sectional area of transverse stroke initiation is about 0.000354m ². The core calculation formula is: flow rate Q (m ³/h)=cross-sectional area A (m ²) × flow velocity v (m/s) × 3600. 1. The calculation method for traffic is based on the formula $Q=A × v × 3600 $. • Inner diameter of pipeline: The nominal diameter corresponding to DN20 is usually 21.25mm (0.02125m). Cross sectional area: $A=\ pi r ^ 2=\ pi × (0.010625) ^ 2 ≈ 0.000354 m ² $. • Flow rate selection: The gas flow rate needs to be determined according to the actual working conditions. The design flow rate range of common industrial gas pipelines is 5-20m/s

2. Flow rate examples at different flow rates are calculated based on the above cross-sectional area. The theoretical flow rates at different flow rates are: • Low speed (5 m/s): $Q=0.000354 × 5 × 3600=6.372 m ³/h $• Medium speed (10 m/s): $Q=0.000354 × 10 × 3600=12.744 m ³/h $• High speed (20 m/s): $Q=0.000354 × 20 × 3600=25.488 m ³/h $3. Key influencing factors: The actual base flow rate needs to consider the following factors to correct the calculation results: • Gas properties: Different gases (such as air, natural gas) The density and compressibility of nitrogen gas vary, and it needs to be calculated as a compressible fluid under high pressure. Pressure and temperature: The operating flow rate and standard flow rate (such as Nm ³/h) need to be converted through the state equation (such as $Q_ {operating condition}=Q_ {standard condition} × (P_ {standard condition}/

2. Calculation of pipeline pressure, flow velocity, and flow rate, conversion between standard and operating condition flow rates

Calculation of pipeline pressure, flow velocity, and flow rate, and conversion between standard and operating condition flow rates

1. Relationship between pipeline pressure, flow velocity, and flow rate In pipeline systems, pressure, flow velocity, and flow rate are three important parameters, and their relationship can be expressed by the following formula: Flow rate calculation formula: Q=V × π× R ² × 3600Q: operating condition flow rate (m ³) V: medium flow velocity (m/s) R: pipeline radius (m) This formula is used to calculate the volume of fluid passing through the pipeline section per unit time given flow velocity and pipeline radius.

2. Calculation Example of Working Condition Flow: Taking stainless steel seamless pipe with diameter of 25.4x1.65, working medium of nitrogen N2, working pressure of P=0.8MPa, working temperature t=20 ℃ as an example, calculate the working condition flow rate: determine the inner diameter of the pipeline: 22.1mm (i.e. 0.0221m), assume the flow velocity V=10m/s and substitute it into the flow calculation formula: Q=10 × π × (0.0221/2) ² × 3600 ≈ 4.53 m ³/h

3. Conversion of Standard Condition and Working Condition Flow Rate In practical applications, due to the different pressures of gas use, it is necessary to c

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