Issues of fluid velocity and pressure drop in pipelines
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Everyone must have thought about this issue: when designing a certain engineering project, the flow rate and pressure drop of the medium in the pipes are taken into consideration to keep them within a reasonable range. High flow rates lead to the generation of static electricity, and high pressure drops result in higher energy consumption; however, the equipment investment is low ； The flow rate is low and the pressure drop is small, but larger-diameter pipes are required, which increases the investment cost. There should at least be a guiding document or some empirical guidelines, right?
Make two plans – which one is more cost-effective for investment?
Take a look at the Chemical Process Design Handbook; it contains the recommended flow rate ranges for different materials. With the recommended flow rate, you can roughly calculate the pipe diameter, and then choose a commonly used one; for example, if the calculated diameter is DN90, you can simply select a DN100 pipe.
Oh, thank you! Additionally, I have also found design specifications (national standards) for hydrogen stations, oxygen stations, acetylene stations, air compression stations, generator gas stations, and so on, which contain detailed regulations.
This. . . . Can you understand pressure loss?
Are pressure drop and pressure loss the same thing? :o
There are standards, and there are also some specialized pipelines such as oxygen for which special requirements need to be taken into account; these also depend on the process conditions. The recommended flow rate range is fairly broad; each factory may have a value that is higher or lower depending on its own processing characteristics – it depends on the specific situation. For long-distance transmission pipelines, attention must be paid to pressure drops, but for circulation pipelines, pressure drop control isn’t as strict since they are quite short.
You can directly check the recommended flow rates in the chemical process design manual; these are all flow rate ranges that have been determined through experience to be cost-effective. In general, it is the balance between fixed investment costs and operational investment costs. For air compression stations, liquid oxygen, and liquid nitrogen, there seem to be specific design standards, and those standards provide relevant details; you should check them out on your own