Regarding the issue of flow rate selection
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How should the flow rate be selected for different media at various temperatures and pressures
The selection of flow velocity depends on the properties and state of the medium being transported, in order to ensure that the allowable pressure drop is met when the fluid flows through the pipe.
The selection of flow rate depends on the properties of the medium being transported, primarily to meet the allowable pressure drop requirements； It is also related to investment.
Additionally, the choice is also determined by the physical and chemical properties of the medium; generally, there are relevant regulations for fluids that are flammable or explosive； There is also something related to the pipe material. (For reference)
For non-flammable and non-explosive media, the allowable pressure drop and investment are the main considerations; for flammable and explosive media, safety factors must also be taken into account.
Please refer to the chemical engineering design manual, which contains information on the media (some under pressure). Then calculate the pressure drop to ensure it meets the process requirements.