Usually we have two aspects of performance and service life for the evaluation criteria of the pump. Performance is the basic parameters of the pump, such as flow, head, motor power, pump efficiency, etc. The service life generally refers to the time from the new product to the unusable time. For the pump, the number of hours of continuous operation at the maximum rated load can be used to measure its service life. The performance of the pump generally depends on the size of the structure at the time of design.
The difference in the manufacturing process, manufacturing accuracy and material selection of each part of the pump and the motor, seal and bearing used in the pump will cause the gap in the service life of the pump. When the pump working, the pumped liquid will corrode the pump to varying degrees in various ways. In actual use, the service life depends on the type of liquid delivered by the pump and the operating temperature. Different types of liquids corrode materials differently, and the same liquid corrodes materials differently at different temperatures. The strength of various materials generally decreases significantly at higher working temperatures.
Therefore, according to the properties of the liquid and the working temperature, the selection of suitable materials has become a key factor affecting the service life of the pump. Commonly used centrifugal pump materials are cast iron, bronze, cast steel, stainless steel, etc. The choice of different materials can cause the final price of the pump to change, even for the same performance pump.
In addition, high-quality seals, bearings, pump shafts, impellers and other components produced by high-precision machining and heat treatment processes will greatly extend the service life of the pump (the cost of the factory will increase). Low-quality factories will reduce production costs by reducing the thickness of the pump body, using inferior motors, and reducing necessary processing procedures to produce cheap products, which have lower service life and lower work efficiency (This will increase the Customer Cost), higher instability.