By comparing two means of heightening feed pump lift range of reactor in a chemical plant shows that the method of deflection with short vane is an effective mean for heightening lift range and efficiency of the low specific speed centrifugal pump.

It is shown after analysis that the efficiency of roto-jet pump is higher than theefficiency of multistage pump and express pump when it operates in the region of low dis-charge and high lift.

From the determination of flow and delivery lift,layout and other aspects analyzed is made.

Analysis of influencing factors on the head of screw centrifugal pump;

Pump head matching in distributed power system;

Based on the working experience, with respect to general feature of pumps used in chemical factories, a set of methods to calculate the parameters, such as flow volume, head, net positive suction head and shutoff pressure, of pumps was summed up.

This paper discusses such design problems in heating systems with the pres- sureless boiler as how the pumping head of the cycle pump is selected ,where the cycle pump is installed and whether the expansion tank is necessary.

In the research of the influences of geometrical parameters of centrifugal pump on the delivery lift,particular attention should be paid on the research of synthetic influence.

According to the construction project of heat supply pipe network with long pipe and complicated surface configuration situations the purpose of adding relay pump, location selection and flow calculation as well as delivery lift are introduced.

The delivery lift of circulation pump in regional heating boiler plant is calculated.