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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 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: Pipeline diameter (inches) • h: Pressure drop (inches of water column) • L: Pipeline length (feet) • 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) | | ---------------------------------------------------------------------------------------------------500000 | Note: The actual flow rate need
2. Relationship between flow velocity and flow rate in natural gas pipelines
The core relationship between flow velocity and flow rate in natural gas pipelines: flow rate=flow velocity x pipeline cross-sectional area 1 The calculation formula for flow rate (Q) is flow velocity (v) multiplied by the cross-sectional area inside the pipeline (A), where: - flow rate unit is changed to m ³/h or Nm ³/h (standard cubic meter) - flow velocity unit is m/s - cross-sectional area calculation: A=π× (D/2) ² (D is the inner diameter of the pipeline) 2 Key parameter correspondence | Pipe diameter (mm) | Allowable flow rate range (m/s) | Typical flow rate range (Nm ³/h) | | ------------------------------------------------------------------------------------------------------------------------------------------------------- Conversion example DN150 pipeline (inner diameter 146.4mm) at a flow rate of 10m/s: flow rate=10 × (3.14 × 0.0732 ²) × 3600=605 Nm ³/h. Note: The above data refers to the latest version of GB50028-2020 "Urban Gas Design Code" requirements
3. How to calculate the natural gas consumption of commercial stoves
The calculation of natural gas consumption of commercial stoves needs to be combined with equipment parameters, usage time and efficiency. Common methods include basic formula method, equipment parameter method, comprehensive estimation formula and heat load calculation method, as follows
The natural gas volume (cubic meters per hour) through the stove is usually taken as 80% of the design flow rate as the peak flow rate. For example, if the designed flow rate of the stove is 5m ³/h, t