After pump should be cleaned of oil at the metal surface rust, and dry on the custody vertical. Flooding should also put a net electric motor with water.

Based on the theory of variety for researching a low head pump system, a new method to separate inlet conduit from pump system was put forward for measuring its hydraulic loss.

Still exist on a lot of different views and disputes about the categorized question of heat pump, put forward the author's own views, point out some mistaken ideas in the routine realizes.