Design a formula for calculating the flow rate per second

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How to calculate the design second traffic?

The designed second traffic is calculated as much as possible, not as much as required; After a second of flow, customize the design flow rate, which has standard requirements. Calculate the pipe diameter according to the formula: D=2 √ (F/π). For example, given 15 cubic meters per hour and a flow rate of 1.5 meters per second: Q=F × V; cross-sectional area F=Q/V=15/3600/1.5≈0.002778m²=2778mm²； Diameter D=2 √ (F/π)=2 √ (2778/3.1416) ≈ 59.5mm. Extension materials:

1. In the textbook "Building Water Supply and Drainage Engineering", considering the economic flow rate factor, the flow rate of the water supply pipeline should be controlled within the normal range during design:

1. For domestic or production water supply pipelines, the flow rate should not exceed 2.0m/s. When noise prevention requirements are met and the pipe diameter is not greater than 25mm, the flow rate can be 0.8-1.0m/s;

2、 The fire hydrant system and fire water supply pipeline should not exceed 2.5m/s; The water supply pipeline of the automatic sprinkler fire extinguishing system should not exceed 5.0m/s, but its water distribution can only be controlled within 10 m/s in individual cases.

2. Economic flow rate refers to the flow rate that minimizes the total cost of water supply (including the construction cost of laying pipelines, the construction cost of pumping stations, and the total operating cost of pumping hidden water) when designing the diameter of water supply pipelines.

1. Flow rate of the main pressure pipeline: 2 to 3m/s;

2、 Low pressure pipeline 0.1 to 1m/s;

3、 Indust

4、 Centrifugal pump suction pipe 1 to 2m/s (diameter less than 250) 1.5 to 2.5m/s (diameter greater than 250) 5 m;

5. Water supply main pipe 1.5 to 3m/s;

6、 Drainage pipe 0.5 to 1m/s;

7、 Cold water pipe 1.5 to 2.5m/s. Reference: Baidu Baike - Code for Design of Building Water Supply and Drainage

2. Formula for Calculation of Second Flow Rate in Water Supply Design

The formula for calculation of second flow rate in water supply design is Qs=μ × n × Qd. In the formula for calculation of second flow rate in water supply design, Qs represents the design second flow buffering amount, measured in liters per second (L/s). μ is the coefficient of flow variation, taken from 1.1 to 1.2, used to consider the peak and fluctuation factors of flow, ensuring that the system has sufficient redundant capacity. N is the coefficient of variation over time, determined based on user characteristics and water usage patterns, with values ranging from 2 to 5, used to consider changes in water usage during different time periods.

3. Calculation formula for design second flow rate of water supply

The design second flow rate calculation formula is used for water supply system design, and its expression is called Qs=μ × n × Qd. In this formula, Qs represents the design second flow rate, measured in liters per second (L/s).

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