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Why Does the Operating Current of a Submersible Pump Increase? Common Causes and Troubleshooting Methods

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Why Does the Operating Current of a Submersible Pump Increase? Common Causes and Troubleshooting Methods Submersible pumps are widely used in wastewater treatment, drainage systems, industrial water supply, construction projects, and underground water pumping applications. During normal operation, the motor current of a submersible pump should remain within the rated range. However, after a period of operation, some users may notice: Increasing motor current; Higher motor temperature; Abnormal vibration or noise; Frequent overload protection trips. These symptoms indicate that the pump may be operating under abnormal conditions. So, why does the operating current of a submersible pump increase? What factors cause the motor load to rise? 1. Increased Load Caused by Changes in Pumping Medium The operating current of a submersible pump is closely related to the motor load. When the characteristics of the pumped liquid change, the resistance inside the pump system may increase. Common situ...
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Why Must a Screw Pump Never Run Dry? Causes of Stator Damage Explained

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 Why Must a Screw Pump Never Run Dry? Causes of Stator Damage Explained Screw pumps are widely used for transferring high-viscosity liquids, sludge, wastewater, chemicals, food products, and other difficult-to-handle media. Compared with many conventional pumps, they can maintain relatively stable flow even when handling viscous or particle-containing fluids. However, there is one operating rule that should never be ignored: A screw pump should not be started or operated without sufficient medium inside the pump. Why is dry running so dangerous? The main reason lies in the working relationship between the rotor and stator. How Does a Screw Pump Work? In a typical single screw pump, also known as a progressive cavity pump, the main pumping elements are: A metallic rotor An elastic stator As the rotor rotates inside the stator, a series of sealed cavities is formed. These cavities continuously move from the suction side toward the discharge side, carrying the medium through the pump....
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Why Does a Diaphragm Pump Outlet Pressure Fluctuate? Causes and Solutions for Stable Operation

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Why Does a Diaphragm Pump Outlet Pressure Fluctuate? Causes and Solutions for Stable Operation In industrial fluid transfer systems, air operated diaphragm pumps are widely used in chemical processing, wastewater treatment, electroplating, food, pharmaceutical, and other industries due to their excellent corrosion resistance, self-priming ability, and capability of handling complex fluids. However, during actual operation, some users may find that the outlet pressure of a diaphragm pump is unstable. Typical symptoms include: Pressure gauge pointer fluctuates continuously; Discharge pressure rises and falls periodically; Downstream equipment cannot maintain stable operation. What causes diaphragm pump pressure fluctuation? How can the pump achieve more stable operation? Shanghai Shangcheng Pump & Valve analyzes the main causes and practical solutions. 1. Unstable Air Supply Pressure For air operated diaphragm pumps, compressed air is the driving power. If the air supply system canno...
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Why Does a Diaphragm Pump Flow Rate Decrease After Long-Term Operation? Causes and Solutions

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 Why Does a Diaphragm Pump Flow Rate Decrease After Long-Term Operation? Causes and Solutions Diaphragm pumps are widely used in chemical processing, wastewater treatment, pharmaceutical, food processing, coatings, and other industries because of their excellent ability to handle high-viscosity fluids, corrosive liquids, and media containing particles. However, during actual operation, many users encounter a common problem: The diaphragm pump works normally at the beginning, but after running for a period of time, the flow rate gradually decreases. Why does this happen? A reduced flow rate does not always mean the pump selection is wrong. In most cases, it is related to air supply conditions, wear of internal components, medium characteristics, or improper maintenance. Shanghai Shangcheng Pump & Valve analyzes the common reasons and solutions for diaphragm pump flow reduction. 1. Insufficient Air Supply Pressure Causes Flow Reduction For air operated diaphragm pumps, compressed...
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Does a Magnetic Drive Pump Need Maintenance During Long-Term Operation? Daily Inspection and Maintenance Guide

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 Does a Magnetic Drive Pump Need Maintenance During Long-Term Operation? Daily Inspection and Maintenance Guide Magnetic drive pumps are widely used in chemical processing, pharmaceutical production, electroplating, environmental protection, and other industries because they eliminate traditional mechanical seal leakage risks. Many users believe: “Since magnetic pumps have no mechanical seal, do they need maintenance?” The answer is yes. Although magnetic drive pumps reduce the maintenance requirements associated with mechanical seals, long-term operation still requires regular inspection and proper maintenance of key components. Shanghai Shangcheng Pump & Valve explains the main maintenance points for magnetic drive pumps to help improve equipment reliability and service life. More information about magnetic pump technology: https://www.scpv.cn/news/877.html 1. Why Does a Magnetic Drive Pump Need Maintenance? A magnetic drive pump mainly consists of: Pump body; Impeller; Inner...
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What Industrial Systems Are Hydraulic Ejectors Suitable For? Applications and Advantages Explained

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 What Industrial Systems Are Hydraulic Ejectors Suitable For? Applications and Advantages Explained In industrial production, many processes require vacuum generation, gas extraction, mixing, or fluid handling. Compared with traditional mechanical vacuum equipment, hydraulic ejectors provide a simple and reliable solution by using high-speed liquid flow to create negative pressure. Because they have no complex rotating components, hydraulic ejectors are widely used in chemical plants, environmental protection systems, vacuum processes, pharmaceutical production, and other industrial applications. Shanghai Shangcheng Pump Valve explains the working principle of hydraulic ejectors and their typical application scenarios. 1. How Does a Hydraulic Ejector Work? A hydraulic ejector is a type of jet device that uses fluid energy to create suction. Its main components include: Nozzle; Suction chamber; Mixing chamber; Diffuser. During operation: High-pressure driving liquid enters the nozzl...
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Why Must Fire Pumps Be Started Regularly During Long-Term Standby? Maintenance Guide for Reliable Operation

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Why Must Fire Pumps Be Started Regularly During Long-Term Standby? Maintenance Guide for Reliable Operation Fire pumps are critical safety equipment used in buildings, industrial facilities, commercial complexes, and public infrastructure. Unlike ordinary water pumps, fire pumps may remain idle for long periods but must start immediately when an emergency occurs. Many users believe: “Since the fire pump is not used every day, it can simply remain stopped until a fire happens.” This is a common misunderstanding. Long-term inactivity can cause problems such as motor failure, pump shaft corrosion, valve sticking, and unstable pressure output. Regular starting and inspection are essential to ensure that fire pumps remain ready for emergency operation. Shanghai Shangcheng Pump Valve explains why fire pumps require periodic operation and what maintenance measures can improve reliability. 1. Why Can’t Fire Pumps Stay Idle for a Long Time? A fire pump is a standby protection device. Its main f...
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