Issues with setting the minimum backflow and vapor line for pumps
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Where are the minimum backflow and vapor line settings for the pump? When starting the pump, which one needs to be turned on and which one needs to be turned off? ?
Judging from the situation in our factory (I don’t know about other factories). . . ) The minimum return line is located between the pump outlet pipeline and the pump inlet pipeline; it is generally sufficient to have a direct connection from the outlet, or the inlet pipeline can be connected to the buffer tank in front of the pump all the way to the pump inlet. As for the vapor line, we have ones at both the inlet and outlet; generally, it can be placed at the outlet. It is mainly used to fill the pump before starting it, and it is closed after filling (unless it is the vapor line of a canned motor pump). The minimum return line is designed to prevent pressure buildup in the pump when it is started; once the pump is turned on fully, the flow rate can be adjusted to the normal level. This is just my personal opinion; I hope all the teachers can point out any shortcomings!
The minimum return line is installed after the pump’s outlet valve and is connected to the pump’s inlet line. However, this minimum return line should not be too long, as otherwise heat will not be able to dissipate, leading to overheating of the pump and potential damage to it; it is merely a temporary solution. If it is to be used frequently, it must be connected to the container that holds the medium at the inlet of the storage pump, so that the fluid can be delivered directly into that container. The size of the pipeline must be sufficient to meet the minimum flow rate allowed by the pump. I’m hearing the term “vapor line of the pump” for the first time. You might be referring to the vent line at the inlet and outlet. It is mainly to check for the presence of any medium or whether it has been measured; DN25 is sufficient