Calculate pipe diameter
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Knowing the flow rate, how do I calculate the pipe diameter? For example, 3.8 m3/h. Thank you all for your advice
This is too simple! According to the formula: D=18.8X(Q/V)^0.5. The key is determining the flow rate; the \"Chemical Process Piping Handbook\" provides general guidelines for the flow rates in most pipelines, and these values can be used as a reference for selection ； For some special pipelines, such as those with particularly strict pressure drop requirements, the flow rate must be selected appropriately.
It can be calculated based on the required flow rate and pressure drop of the fluid within the pipeline
The formula is quite simple; anyone who has studied mathematics can understand it. The tricky part is choosing the flow rate. Let me explain my usual approach: first, it’s necessary to know what medium is being used, the length of the pipeline, and the pressure drop. Using these values, it’s possible to determine a range for the flow rate of that medium (usually by referring to tables or relying on experience). Next, a standard pipe diameter is assumed and used in the formula for calculation. If the resulting diameter falls within the range determined earlier, then the assumed diameter is suitable; otherwise, the assumed diameter is adjusted until the resulting flow rate falls within that range.
I wonder what empirical assumptions you have regarding the flow rate? ? For example, what is the typical flow rate of water in an RO membrane? ? ? Thank you!
You can check the chemical process design manual, which specifies some common flow velocities for fluids that can be used as a reference.
Knowing the volume but not the length, it’s impossible to calculate the flow rate
Can’t we assume the flow rate first and then determine the pipe diameter?
The standard algorithm involves calculating based on the pressure drop per 100 meters. It depends on what the medium is – gas or liquid – whether it’s at the pump outlet or inlet, or in the case of ordinary pipelines. A pressure drop value per 100 meters is selected according to the relevant standards, and then calculations can be carried out using this value
D=18.8* √Q/; p is the pressure in kilograms, and V is the flow rate; actually, it’s usually easy to determine the appropriate value once the flow rate is known!