Calculation

A pipe diameter can be assumed first to calculate the flow velocity, and then it can be determined whether the pressure drop is appropriate. It is also possible to set a 100-meter pressure drop to calculate the pipe diameter, and then determine the flow velocity accordingly. You can take a look at the Process Piping Installation Design Manual for Petrochemical Plants, Part 1.

Based on the fundamental equations of fluid mechanics, flow velocity and pipe diameter can be calculated using known properties of the medium, flow rate, pressure, and temperature. The specific calculation method depends on the properties of the fluid and its flow state. The flow rate can be calculated based on the flow volume and the cross-sectional area of the pipe. Flow rate is the volume of fluid that passes through a pipe per unit of time, with the unit typically being cubic meters per second. Using the known flow rate and the cross-sectional area of the pipe, we can determine the flow velocity. The pipe diameter can be calculated using the known flow rate and velocity. We can use the continuity equation, which states the conservation of flow rate across a pipe cross-section, by substituting the known flow rate and velocity into this equation to determine the cross-sectional area of the pipe, and thus calculate the pipe diameter. It should be noted that the aforementioned calculation method assumes an ideal fluid, that is, it does not take into account factors such as viscosity and turbulence. In practical applications, it is also necessary to consider the impact of these factors on flow velocity and pipe diameter, which may require the use of more complex models and calculation methods. .

First, determine the pipe flow velocity based on the flow rate recommended in the manual, and then determine the pipe diameter based on the flow volume. Of course, it is ultimately determined based on the pressure drop allowed by the process engineering.