『Calculation formula for pipeline gas flow rate』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
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. What is the formula for calculating gas flow rate in pipelines?
The calculation of gas flow rate can be carried out in two main ways
1. Use the ideal gas state equation for calculation.
. The ideal gas state equation is PV=nRT, where P is the pressure of the gas, V is the bulk product of the gas, n is the number of moles of the gas, R is the gas constant, and T is the pre volt temperature of the gas. According to this formula, the flow rate formula can be derived as follows: Q=A * v, where Q is the flow rate, A is the cross-sectional area, and v is the velocity at which the flow is cleared. 2. The calculation of pipeline gas flow rate refers to the standard state flow rate of the gas or the gas flow rate under specified operating conditions. The formula for gas flow rate without temperature and pressure condition correction is: velocity cross-sectional area. The formula for gas flow rate corrected by temperature and pressure conditions is: flow velocity cross-sectional area * (pressure 10+1) (T+20)/(T+t). The pressure is the pressure of the gas at the current carrying section, measured in MPa, T is the absolute temperature, measured in K, and t is the actual temperature of the gas at the current carrying section.
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