For the split multi-stage pump, the middle section carries internal pressure, and the last internal section carries the maximum internal pressure. The shape of the middle part is the same as a cylinder, so it can be counted as a thin walled cylinder equipped with internal pressure.However, this design does not require internal pressure to calculate the single-level single-section clean water-centered pump.Widely considered, the analogy method is used to compare it to other IS pumps, and the middle wall is taken as a semi. ...