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Here are some common questions about centrifugal pumps and their answers: 1. What is a centrifugal pump? Answer: A centrifugal pump uses an impeller to subject the liquid flowing through it to centrifugal force, thereby increasing the liquid’s mechanical energy and enabling the transport of the liquid; it is a machine that boosts the energy of liquids. II. What are the characteristics of horizontal centrifugal pumps? Answer: The features of horizontal centrifugal pumps include their ability to meet the requirements of chemical processing processes, corrosion resistance, tolerance to high and low temperatures, wear resistance, erosion resistance, reliable operation, minimal or no leakage, and the capability to transport liquids in critical states. III. How are chemical pumps classified according to their working principle and structure? Answer: Based on their working principle, chemical pumps can be divided into vane pumps, positive displacement pumps, and other types of pumps. For example, there are electromagnetic pumps that use electromagnetic forces to transport liquid in a conductive state, as well as pumps that utilize fluid energy to move liquids, such as jet pumps and air lifters. IV. What are the key points for commissioning horizontal centrifugal pumps? Answer: The key points for commissioning a horizontal centrifugal pump include prohibiting operation without liquid, installing the pump on a stable foundation to prevent it from being affected by vibrations from other machinery, leaving sufficient space around the pump for maintenance, ensuring that the inlet pipeline does not have any upward bends to avoid the formation of air pockets inside the pipeline, installing valves at both the pump’s inlet and outlet as well as pipe compensators to facilitate maintenance, and using the jog mode to check whether the pump rotates smoothly. V. Why do horizontal centrifugal pumps run idle? Answer: The reason for a horizontal centrifugal pump to run idle may be insufficient medium at the pump’s inlet or inadequate inlet pressure, or a blockage in the pump’s inlet pipeline, or air remaining inside the pump chamber that has not been removed. VI. Why does a horizontal centrifugal pump stop discharging fluid? Answer: The reasons for the interruption in discharge from a horizontal centrifugal pump may include air leakage in the suction pipeline, air leakage in the foot valve, seal leakage, poor lubrication of the rolling bearings in the intermediate shaft and support shafts, or severe damage to these components. VII. What are the characteristics of centrifugal pumps? Answer: The characteristics of centrifugal pumps include: their ability to meet the requirements of chemical processing processes. Corrosion-resistant. Resistant to high and low temperatures. Wear-resistant and erosion-resistant. Runs reliably. No leakage or minimal leakage. It can transport liquids in a critical state. VIII. What is the working principle of a centrifugal pump? Answer: The working principle of a centrifugal pump is to use an impeller to subject the liquid flowing through it to centrifugal force, thereby increasing the liquid’s mechanical energy and enabling the transport of the liquid. IX. How is the flow rate of a centrifugal pump calculated? Answer: The flow rate of a centrifugal pump is usually expressed as the volume of liquid discharged per unit of time, with units such as cubic meters per hour (m3/h), liters per minute (L/min), and liters per second (L/s). X. How is the head of a centrifugal pump calculated? Answer: The head of a centrifugal pump refers to the energy gained per unit weight of liquid after it passes through the pump; it is usually denoted by “H” and is measured in meters (m). XI. How is the efficiency of a centrifugal pump calculated? Answer: The efficiency of a centrifugal pump is the ratio of the pump’s useful power to its shaft power, and it is usually expressed as a percentage. 12. What does the rotation speed of a centrifugal pump refer to? Answer: The speed of a centrifugal pump refers to the rotational speed of the pump shaft per minute, with the unit usually being revolutions per minute (r/min). 13. What does the power of a centrifugal pump refer to? Answer: The power of a centrifugal pump usually refers to the input power, that is, the power transmitted from the prime mover to the pump. Below are some common technical issues related to centrifugal pumps and their solutions: 14. What should be done if a centrifugal pump has insufficient flow rate? Answer: Insufficient flow in a centrifugal pump can be caused by various factors, such as wear of components inside the pump, pipe blockages, or changes in the properties of the fluid being pumped. Solutions include checking whether the components inside the pump need to be replaced, checking for blockages in the pipes, and adjusting the pump’s operating parameters according to the properties of the medium. 15. What to do if the head of a centrifugal pump is insufficient? Answer: Insufficient head in a centrifugal pump can be caused by various factors, such as wear of internal components, damage to the impeller, or insufficient pipeline resistance. Solutions include checking whether the components inside the pump need to be replaced, checking if the impeller is damaged, and increasing pipeline resistance, etc. 16. What should be done if a centrifugal pump produces excessive noise and vibration? Answer: Excessive noise and vibration in a centrifugal pump can be caused by various factors, such as wear of components inside the pump, damaged bearings, or loose pipes. Solutions include checking whether the components inside the pump need to be replaced, checking if the bearings are damaged, and tightening the pipes. 17. What to do if there is a leak in a centrifugal pump? Answer: Leaks in centrifugal pumps can be caused by various reasons, such as damaged seals or loose pipe connections. Solutions include checking whether the seals need to be replaced and tightening pipe connections. 18. What should be done if a centrifugal pump consumes too much power? Answer: Excessive power consumption in a centrifugal pump can be caused by various factors, such as wear of components inside the pump, damage to the impeller, or changes in the properties of the fluid being pumped. Solutions include checking whether the components inside the pump need to be replaced, checking if the impeller is damaged, and adjusting the pump’s operating parameters according to the properties of the medium. 19. What should be done about cavitation in centrifugal pumps? Answer: Cavitation in centrifugal pumps occurs due to the vaporization of liquid inside the pump, which creates bubbles and affects the pump’s performance and efficiency. Solutions include increasing the pump’s suction pressure, reducing the pump’s flow rate, and using cavitation-resistant materials.