FluidTech News

 Why Can an Oil Pump Fail to Draw Oil? Installation and Troubleshooting Guide Oil pumps are widely used in industrial lubrication systems, fuel transfer equipment, hydraulic machinery, and various oil circulation applications. However, a common problem often occurs during operation: The oil pump starts running, but no oil is discharged, or the suction speed becomes very slow and the pressure cannot be established. Many users assume that the pump itself is damaged, but in many cases, the problem is related to: Incorrect installation; Air leakage in pipelines; Oil condition; Improper operating methods. Understanding the real cause can help reduce downtime and improve equipment reliability. 1. Air Inside the Pump Chamber Prevents Oil Suction Before starting some oil pumps, the pump chamber needs to be filled with oil. If too much air remains inside the pump: The pump cannot generate sufficient suction; Internal sealing performance decreases; Oil cannot be transported normally. This si...

 Why Does a Gear Oil Pump Lose Pressure Over Time? Common Causes and Troubleshooting Guide Gear oil pumps are widely used in lubrication systems, fuel transfer systems, hydraulic equipment, and industrial machinery because of their compact structure, reliable operation, and stable pressure performance. However, during long-term operation, many users encounter a common problem: The gear oil pump pressure gradually decreases after running for a period of time. At the beginning, the system works normally, but later the pump may show: Lower outlet pressure; Reduced oil supply; Increased operating noise; Unstable equipment lubrication. Why does this happen? The pressure decline is usually related to internal wear, oil conditions, suction problems, and system components. 1. Internal Gear Wear Increases Leakage A gear oil pump works by using the meshing movement of two gears to transport oil from the inlet side to the outlet side. During normal operation, the clearance between gears and t...

Why Are Rotary Lobe Pumps Suitable for High Viscosity Fluid Transfer? Key Advantages Explained In industries such as food processing, pharmaceuticals, cosmetics, chemicals, and environmental engineering, fluid transfer often involves materials with high viscosity. Typical examples include: Syrup; Honey; Cream products; Resin; Adhesives; Lubricating oil; High concentration chemical liquids. These materials have poor fluidity and high internal resistance, making them difficult to handle with conventional centrifugal pumps. For these applications, rotary lobe pumps are widely used because of their unique operating principle and gentle transfer characteristics. 1. Why Are Centrifugal Pumps Not Ideal for High Viscosity Fluids? Centrifugal pumps generate pressure through high-speed impeller rotation. They work well with: Water; Low viscosity liquids; Fluids with good flow characteristics. However, when viscosity increases, several problems appear: Pump efficiency decreases; Flow rate drops; ...

 Why Do Chemical Pumps Often Experience Mechanical Seal Leakage? Causes and Prevention Methods In chemical processing industries, pumps are required to handle various challenging fluids, including corrosive chemicals, high-temperature liquids, solvents, and fluids containing solid particles. Compared with ordinary water pumps, chemical pumps operate under much harsher conditions. One of the most common maintenance problems is: Mechanical seal leakage. Many operators find that a chemical pump works normally after installation, but after a period of operation, leakage begins to appear. Why does this happen? The answer is usually related to fluid characteristics, operating conditions, seal material selection, and maintenance practices. 1. Corrosive Fluids Damage Mechanical Seal Components Chemical pumps often transport: Acids; Alkalis; Organic solvents; Corrosive chemical solutions. If the mechanical seal materials are not suitable for the pumped medium, corrosion may occur. Typical p...

How Does Impeller Size Affect Flow Rate and Head of CDLF Stainless Steel Multistage Centrifugal Pumps? In industrial water supply systems, reverse osmosis pretreatment, boiler feed water, equipment circulation, and pressure boosting applications, CDLF stainless steel multistage centrifugal pumps are widely used because of their compact structure, stable pressure performance, and corrosion-resistant design. During pump selection, many users have a common question: “Does a larger impeller always mean higher flow and pressure?” The answer is not simply yes. The impeller size has a direct impact on pump performance, but the final operating condition also depends on the system resistance, motor power, and operating point. Understanding the relationship between impeller size, flow rate, and head is important for correct pump selection. 1. What Is the Function of an Impeller in a CDLF Pump? A CDLF pump is a vertical multistage centrifugal pump. Inside the pump, multiple impellers are arranged...

What Happens When the Suction Lift of a Self-Priming Pump Exceeds the Rated Height? Self-priming pumps are widely used in industrial water supply, wastewater treatment, chemical transfer, and other applications because they can automatically evacuate air from the suction line and start pumping without manual priming every time. However, during installation, one common mistake is often overlooked: The suction lift of the self-priming pump exceeds the designed limit. When the pump is installed too high above the liquid level or the suction pipeline is too long, the pump may experience poor suction performance, unstable operation, or even damage. So, what happens when the suction lift exceeds the specified height? What Is Suction Lift of a Self-Priming Pump? Suction lift refers to the vertical distance between the liquid surface and the centerline of the pump inlet. In simple terms, it represents how high the pump needs to lift the liquid before it can transport it. Although self-priming ...

 Why Are Screw Pumps More Stable for Handling Fluids with Solid Particles? Structural Advantages Explained In industries such as wastewater treatment, chemical processing, oil production, food processing, and environmental engineering, transporting fluids containing solid particles has always been a challenge. Many conventional pumps may experience problems when handling particle-containing media, including: Impeller blockage; Severe wear; Unstable flow; Reduced operating efficiency. Screw pumps, especially progressive cavity screw pumps, are widely used in these applications because of their excellent adaptability to complex fluids. So why can screw pumps transport particle-containing media more reliably? The answer lies in their unique positive displacement structure. 1. Continuous Conveying Structure Reduces Blockage Risk Unlike centrifugal pumps that rely on high-speed impellers to generate centrifugal force, screw pumps transport fluids through the continuous movement of seale...

 Can Magnetic Pumps Handle High Temperature Fluids? Temperature Limits and Selection Guide In chemical processing, petrochemical, renewable energy, and industrial manufacturing, many applications require the transportation of high temperature fluids, such as thermal oil, hot chemical solutions, and high temperature process liquids. A common question from engineers and equipment buyers is: Can a magnetic drive pump be used for high temperature media? The answer is yes, but only when the pump design, material selection, and operating conditions are properly matched. Magnetic pumps provide a major advantage of leak-free operation, but high temperature applications place higher requirements on the magnetic coupling system, containment shell, bearings, and cooling circulation. Why Does High Temperature Affect Magnetic Pump Performance? A magnetic drive pump transfers power through a magnetic coupling system. The motor drives the outer magnet rotor, and the magnetic field transfers torqu...

Water Jet Ejector vs Vacuum Pump: Differences and How to Choose for Different Applications In industrial vacuum systems, both water jet ejectors and vacuum pumps are widely used to create negative pressure. Although their purpose is similar, their working principles, operating conditions, maintenance requirements, and application fields are quite different. Choosing the right equipment is not simply about which one provides a higher vacuum level. The key is matching the equipment with the actual process requirements. 1. Different Working Principles Water Jet Ejector: Using Fluid Energy to Generate Vacuum A water jet ejector uses high-speed liquid flow to create a low-pressure area. When the driving water passes through the nozzle, the velocity increases and pressure decreases. The generated vacuum effect draws in gas or other media, and the mixed fluid is discharged together. Main features: No rotating parts; Simple structure; Strong corrosion resistance; Suitable for harsh industrial ...

 What Are Reciprocating Pumps Used For? High Pressure Applications and Selection Guide In industrial fluid transportation, choosing the right pump type is critical for system efficiency and reliability. When the application requires: High discharge pressure; Stable flow performance; Precise fluid delivery; a reciprocating pump is often a better choice than a conventional centrifugal pump. Unlike centrifugal pumps that generate pressure through high-speed impellers, reciprocating pumps work by changing the volume inside the pump chamber through piston or plunger movement. This working principle makes them especially suitable for high-pressure and low-flow applications. Why Are Reciprocating Pumps Suitable for High Pressure Applications? 1. Excellent High Pressure Capability One of the biggest advantages of reciprocating pumps is their ability to generate high pressure. Because the pump transfers energy through positive displacement, the outlet pressure is mainly determined by the sy...

 What Is the Difference Between a Metering Pump and a Dosing Pump? A Complete Guide Before Purchase In water treatment, chemical processing, pharmaceutical production, and industrial automation systems, pumps are often used to transfer and inject chemicals accurately. A common question from engineers and buyers is: “What is the difference between a metering pump and a dosing pump?” Although these two terms are often used interchangeably, there are differences in their definitions and application purposes. Understanding these differences can help users select the right pump and avoid problems caused by incorrect selection. 1. What Is a Metering Pump? A metering pump is a precision positive displacement pump designed to deliver a controlled amount of liquid. The main purpose of a metering pump is: Accurate flow control; Stable liquid delivery; Adjustable output; Reliable operation under pressure. Common types include: Diaphragm metering pumps; Plunger metering pumps; Hydraulic diaphr...

 What Media Can a Vertical Sump Pump Handle? A Practical Selection Guide Choosing the right vertical sump pump is not simply about matching flow rate and head. In many industrial applications, the type of liquid being transferred has a much greater impact on pump reliability, maintenance costs, and service life. Whether you work in chemical processing, electroplating, wastewater treatment, or industrial cooling systems, understanding the characteristics of the pumped medium is the first step toward selecting the correct pump. Why Vertical Sump Pumps Are Ideal for Industrial Tanks Unlike conventional centrifugal pumps, a vertical sump pump operates with its hydraulic section submerged below the liquid level. Because the pump casing is already filled with liquid, there is no need for manual priming before startup. This design provides several advantages: Continuous liquid supply to the impeller Stable operation without suction loss Reduced risk of cavitation Reliable performance in d...

 Rotor Pump Maintenance Tips: How to Extend Service Life and Reduce Downtime When a rotor pump fails unexpectedly, many operators blame the pump itself. In reality, most rotor pumps do not fail because of poor design. They fail because of small maintenance issues that were ignored for too long. A leaking seal becomes a shutdown. A lubrication issue becomes a gearbox replacement. A few minutes of preventive maintenance can often save days of production loss. 1. Dry Running Is the Fastest Way to Kill a Rotor Pump Rotor pumps depend heavily on the pumped medium for: lubrication; cooling; seal protection. Even a short period of dry running may result in: mechanical seal failure; overheating; rotor damage; excessive wear. This is especially important in food and pharmaceutical applications where pumps are frequently started and stopped. Installing dry-run protection is usually far cheaper than replacing a seal assembly. 2. Small Seal Leaks Should Never Be Ignored Many operators think: ...

 Why Is My CDLF Stainless Steel Multistage Pump Losing Pressure? A Practical Troubleshooting Guide A pressure drop in a CDLF multistage pump often causes immediate concern. Many operators assume: "The motor must be failing." In reality, that's rarely the case. In industrial water systems, pressure loss is usually caused by changes in the system rather than damage to the pump itself. Before replacing expensive components, it is worth checking a few common causes first. 1. Start With the System, Not the Pump A pump that worked perfectly six months ago may suddenly struggle to maintain pressure today. What changed? Possible reasons include: additional equipment connected to the pipeline; longer pipe runs after expansion projects; new filters installed in the system; partially closed valves; scaling inside the pipes. Every one of these factors increases system resistance. The pump may be operating normally while the system demand has simply exceeded the original design condit...