Calculation method for natural gas flow rate

『Calculation method for natural gas flow rate』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)

1. What is the flow standard for natural gas pipelines?

There is no fixed standard value for the flow of natural gas pipelines, and it needs to be calculated based on pipeline cracking parameters and gas demand. The following are specific calculation methods and typical scenario values.

1. The general calculation formula adopts the internationally commonly used formula (unit: British system):$ q = 3550 \times [\frac{d^5}{(1 + \frac{3.6}{d} + 0.03 \times d)}]^{\frac{1}{2}} \times (\frac{h}{L \times SG})^{\frac{1}{2}}$ •q： Volume flow rate (CFH, cubic feet per hour) • d: Diameter of the collapsed pipeline (inches) • h: Pressure drop (inches of water column) • L: Pipeline length (feet) • Absolute SG: Gas specific gravity (0.60 for natural gas) 2 The calculation of urban gas pipeline flow is based on the maximum hourly gas consumption of the calculation month (unit: metric): $Q_ {h}=\ frac {Q_ {a} {n} \ times K0 {m} \ times K0 {d} \ times K0 {h} $• Qh: hourly flow (m ³/h) • Qa: annual gas consumption (m ³/a) • n: annual maximum load utilization hours (usually 2920-5840h) • Km: monthly peak coefficient (1.1-1.3) • Kd: daily peak coefficient (1.05-1.2) • Kh: hourly peak coefficient (2.5-3.2) 3 The calculation of residential user flow adopts the simultaneous working coefficient method (unit: metric): $Q_ {h}=\ um K N Q_ {n} $• K: simultaneous working coefficient of gas appliances (determined by looking up the table) • N: number of similar gas appliances • Qn: rated flow rate of a single gas appliance (m ³/h) 4. Typical design reference values | pipeline type | diameter range | typical flow range (m ³/h) | | ---------------------------------------------------------------------------------------------------50000

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3. How to calculate the flow rate of natural gas? According to the relationship between gas flow rate and pressure, the following formula can be used for conversion: flow rate=pressure/resistance, where flow rate is measured in cubic meters per second (m ³/s), pressure is measured in pascals (Pa), and resistance is measured in pascals per second per cubic meter (Pa · s/m ³). Therefore, the above formula can be transformed into: flow rate=pressure/resistance flow rate=pressure/(resistance coefficient x fluid density x average velocity), where the resistance coefficient is a constant related to the pipeline and fluid, the fluid density is the density of the fluid, and the average velocity is the average velocity of the fluid. For incompressible fluids, the fluid density can be considered as a constant, so the above formula can be simplified as: flow rate=pressure/(drag coefficient x average velocity). For gases, the ideal gas state equation can be used to calculate their density: gas density=gas mass/gas volume Gas density=gas mass/(gas molar mass x gas molar volume), where gas molar mass is the molar mass of the gas and gas molar volume is the molar volume of the gas in the standard state. Therefore, the above formula can be converted into: flow rate=pressure/flow rate (resistance coefficient x average velocity x gas molar mass x gas molar volume). It should be noted that different resistance coefficients and average velocities need to be used for different gases and applications. Therefore, in practical applications, c

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