The development direction of stainless steel pumps

It is reported that the Ministry of Industry and Information Technology is formulating a "Strategic Plan for the 'Going Global' of Manufacturing Industry", strengthening the overall coordination and classified guidance for enterprises. In order to cope with the increasingly globalized industrial development, it is essential for us to have an understanding of the current situation and development trends of stainless steel pumps and water pumping stations worldwide.

With the continuous improvement of the design, manufacturing technology and application technology of stainless steel pumps, the manufacturing and production of stainless steel pumps are developing in the direction of large-scale, high-capacity, high-head and high-speed, serialization, generalization and standardization. The level of automation control in pumping stations is also getting higher and higher.

1. Large-scale and high-capacity

In the past few years of 2009, the technology of large stainless steel pumps has developed rapidly. The impeller diameter of giant axial flow pumps has reached 7 meters, and that of submersible pumps has reached 1 meter. The largest single-unit capacity of axial-flow pumps produced in our country is 6,000 kW, that of mixed-flow pumps is 7,000 kW, and that of centrifugal pumps is 8,000 kW. The single-unit capacity of the high-pressure boiler feed water pump has reached 60,000 kW. The flow rate of the new type of centrifugal submersible pump has reached 1800m ³ /h, with a corresponding head of 110m and a maximum water output of 28,800 m ³ /h, and there is a trend of further expansion. In terms of pumping stations, a number of large-scale water pumping stations with novel structures have emerged, such as "egg" -shaped structure pumping stations and pumping stations with combined inlet and outlet pipes and pools. With the promotion and application of submersible pumps in drainage, a number of large and medium-sized pumping stations with small space, low investment and new structures have emerged accordingly, such as wet well pump house structures constructed of steel or reinforced concrete.

2. High head and high speed

With the continuous improvement of problems such as cavitation in water pumps and material strength, the rotational speed of water pumps is also getting faster and faster. In the 1980s, the rotational speed of the international standard multi-stage segmented centrifugal pump was 7,500 r/min, and it has now been increased to 10,000 r/min. An increase in rotational speed will inevitably lead to an increase in the head of the water pump. In 2009, the single-stage head of boiler feed water pumps had broken the record of 1,000 meters, and the head of multi-stage pumps could reach over 2,000 meters. To further achieve high head, it is necessary to increase the rotational speed of the pump. Subsequently, with the continuous advancement of technology, the rotational speed of pumps has further developed towards higher speeds. In the water pump industry, this trend of high-speed development is global.

3. Serialization, generalization and standardization

The serialization, generalization and standardization of products (referred to as the "three standardizations" for short) are inevitable requirements of modern industrial production processes. In 1975, the International Association for Standardization established the main dimensions and specification parameters of single-stage centrifugal pumps with a rated pressure of 720kPa (ISO2858-1975E). The performance range of this standard pump is: flow rate 6.3 to 400m ³ /h, and head 25 to 125m. In 2009, in Europe, all pumps that met this specification were sold as standard pumps. Since 1958, China has made considerable efforts in unifying models, series classification, and standardized dimensions. Series standards have been established for the main components of water pumps, such as brackets, suspensions, and bearing frames, and the degree of "three modernizations" of the products is constantly improving.

4. The automation level of pumping stations has been gradually improving

In the past few years of 2009, the automation equipment of pumping stations has become increasingly complete, and the level of automatic control has also been continuously improving. Modern pumping stations can achieve automatic control from the start-up of units, monitoring operation, shutdown to the regulation and optimal dispatching of multi-stage pumping station systems. Computer technology and network systems are increasingly widely applied in the automatic control of pumping stations, and the management level is also gradually improving.

With the development of science and technology such as atomic energy and fuel and chemical industries, there will be a further demand for the development of various special water pump products with high speed, high temperature and high pressure resistance, high efficiency and large capacity. At the same time, it is also required to continuously improve the quality and level of existing conventional products. To achieve this goal, innovations must be made in a series of links, including basic theories, computing techniques, model tests, measurement methods, as well as material selection and processing techniques. In terms of the design and operation management of pumping stations, active measures should be taken to maximize the efficiency of working pumps and enhance the level of automatic control of pumping stations.

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Source: China Pump Industry Network