『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 t
2. Calculation formula for gas flow rate
There are multiple calculation formulas for gas flow rate, as follows:
1. Gas flow rate refers to the volumetric flow rate of gas passing through a certain section at a specific temperature, expressed as Q=P × (dV divided by dt), where P is the pressure macro of gas at a certain temperature, and dV divided by dt is the volume change rate of gas per unit time.
.2、 The gas flow rate can also be expressed as the product of cross-sectional area and flow velocity, i.e. Q=A × V, where A is the cross-sectional area and V is the flow velocity.
3、 The gas flow rate can also be expressed as the absolute number of pressure and temperature functions, that is, Q=(P × S × T) divided by (T+t), where P is the gas pressure, S is the cross-sectional area of the pipeline, T is the absolute temperature threshold, and t is the temperature.
4、 For incompressible gases, the simplified formula Q=A × V can be used, where A is the cross-sectional area of the pipeline and V is the flow velocity of the gas inside the pipeline.
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