4.多级管道泵适用于保送无腐蚀性液体，有甲烷或煤矿井下固定设备I类及工厂IIA、II B级，温度组别为 T1、T2、T3、T4组存在炸性混合物的其它工业场所。运用温度80℃以下。
Multistage centrifugal pump is a kind of commonly used pump. With the development of economy and the progress of science and technology, the pump technology is constantly improved. People who use it are also pursuing energy saving and environmental protection from time to time. Here is how to save energy for multi-stage centrifugal pump. Multistage centrifugal pump is designed on the basis of centripetal force principle. High-speed rotating impeller blade drives water to rotate and throws water out, so as to achieve the purpose of delivery. There are many kinds of multi-stage centrifugal pumps, which can be divided into civil and industrial pumps in operation, and water purification pumps, impurity pumps and corrosion resistant pumps in delivery media.
After technical transformation of multi-stage centrifugal pump to stop impeller cutting, the scene of equipment "big horse trolley" was changed. Multistage centrifugal pump is the main fluid delivery equipment in the process of petrochemical consumption. The operation of the equipment often leaves a large design margin. Because the pump design margin mostly consumes 5.26 million kilowatt-hours of electricity, resulting in serious wastage of energy. The working principle of centrifugal pump is that centrifugal pump can send water out because of centripetal force. Before the pump works, the pump body and the intake pipe must be filled with water to form a vacuum state. When the impeller rotates rapidly, the blade prompts the water to rotate quickly. The rotating water flies from the impeller under the action of centripetal force. After the water in the pump is thrown out, the central part of the impeller forms a vacuum area. The water of Shuiyuan is pressed into the intake pipe through the pipe network under the action of atmospheric pressure (or water pressure). In this way, continuous pumping can be completed. It is worth mentioning here that the centrifugal pump must be filled with water before starting. Otherwise, the pump body will not be able to complete suction, forming heat, vibration, no water, resulting in "idling" and damage to the pump (abbreviated as "air binding") to form equipment accidents.