FluidTech News

 Why Does a CDLF Multistage Pump Vibrate? Structure Issue or System Problem? Many users assume one thing when a CDLF stainless steel multistage pump starts vibrating: 👉 “Is the pump poorly designed?” But in real-world applications, the truth is: 👉 Most vibration issues are NOT caused by the pump itself — but by the system. 🔍 The Key Conclusion 👉 Vibration = Structure + System + Operating Conditions However, based on field experience: 👉 System-related issues account for 60–70% ⚠️ Common Causes of Vibration 1. Pipe Stress on the Pump Poor pipe support Misalignment External load applied to pump 👉 Leads to deformation and vibration 2. Operating Away from Design Point Too low flow Too high flow 👉 Causes hydraulic instability inside the pump 3. Cavitation (Very Common) High suction lift High inlet resistance 👉 Results in noise + strong vibration 4. Structural Factors (Less Common) Shaft misalignment Rotor imbalance Bearing wear 👉 Usually due to installation or long-term operatio...

 Material Performance Changes of Chemical Pumps Under High-Temperature Conditions (With Selection Guide) In chemical processing industries, handling high-temperature fluids such as thermal oil, hot water, and corrosive liquids is very common. Chemical pumps are expected to operate reliably under these demanding conditions. However, a frequent issue reported by users is: 👉 A pump that performs well at ambient temperature often shows instability under high-temperature operation. The root cause is not simply “heat” — but changes in material properties caused by elevated temperatures. 1. What Does High Temperature Really Affect? High temperature impacts not only the operating environment but also the internal behavior of pump materials: Mechanical strength decreases Thermal expansion alters clearances Sealing materials degrade Corrosion rates accelerate 👉 These factors directly affect the stability and lifespan of chemical pumps. 2. Key Material Performance Changes at High Temperatur...

 Early Signs of Impeller Blockage in Submersible Sewage Pumps In wastewater handling and construction drainage, one common misconception is: 👉 “The pump works fine until it suddenly stops.” In reality: 👉 Impeller blockage is a gradual process, not an instant failure. Even well-designed pumps—such as those from Shanghai Shangcheng Pump Valve—which feature optimized anti-clogging structures, can still experience buildup over time under complex working conditions. 🔗 Product structure reference: https://www.scpv.cn/pumps/QW.html 1. Key Insight First 👉 When blockage begins, the pump doesn’t stop — its performance starts to deteriorate. In other words: 👉 It’s still running, but no longer running properly. 2. 6 Early Warning Signs You Shouldn’t Ignore ① Reduced Flow Rate (Most Obvious) Partial blockage inside the impeller or flow passage leads to: Reduced effective flow area Increased resistance 👉 Result: noticeably lower discharge capacity ② Decreased Head / Weak Discharge As block...

 Running a Pipeline Centrifugal Pump at Low Flow? It’s Quietly Damaging Your Pump A very common habit in the field: 👉 “Flow too high? Just close the valve a bit.” Sounds simple — but here’s the truth: 👉 Low-flow operation = unstable internal flow = long-term damage 💥 What actually happens inside? ✔ Inlet Recirculation Liquid starts flowing backward near the impeller eye ✔ Stronger Vortices Flow becomes chaotic, energy gets wasted ✔ Flow Impact on Blades Instead of following the blade angle, liquid hits it ✔ Higher Cavitation Risk Low-pressure zones → bubbles → collapse → damage 📉 What you’ll notice on site More noise (humming / rumbling) Increasing vibration Unstable discharge Performance drops over time 👉 In most cases, low-flow operation is the real cause 🚫 Biggest misconception 👉 Low flow ≠ low load In reality: 👉 It’s an off-design, stressful condition Your pump is not “relaxing” — it’s struggling. ✅ What should you do? ✔ Keep operation near design flow (BEP) ✔ Avoid lon...

 What Happens When Gas–Liquid Separation in a Self-Priming Pump Is Incomplete? In many real-world applications, there is a critical but often overlooked truth: A self-priming pump does not fail because it “cannot pump” — it fails because it cannot fully separate air from liquid. If gas–liquid separation is insufficient, the pump may still run, but its performance, stability, and lifespan will all be compromised. 👉 For a deeper technical breakdown, you can refer to: 🔗 https://www.scpv.cn/news/868.html 1. First, Understand the Mechanism A self-priming pump works by repeatedly circulating a gas–liquid mixture: Air + liquid enter the pump The mixture flows into the separation chamber Air is discharged, liquid recirculates Only when air is fully expelled can the pump establish a stable vacuum and normal operation . 2. Key Impacts of Insufficient Gas–Liquid Separation ① Loss of Self-Priming Ability If air remains trapped inside the pump: Vacuum level drops Suction capacity weakens 👉 R...

 How Does Stator Stress Change in a Progressive Cavity Pump Under High Pressure Differential? In industries such as wastewater treatment, oil & gas, and high-viscosity fluid transfer, progressing cavity pump is widely used due to its steady flow, low pulsation, and strong adaptability. However, in real-world operation, a common issue is often observed: 👉 Under high pressure differential conditions, stator wear accelerates significantly Many assume this is simply due to “high pressure,” but the deeper reason is: 👉 The internal stress distribution within the stator has fundamentally changed Basic Principle: Progressive Sealing Cavities A progressing cavity pump operates by: Forming sealed cavities between the rotor and stator Transporting fluid progressively from suction to discharge 👉 Each cavity carries part of the pressure 👉 Essentially: Pressure is distributed step-by-step along the axial direction How High Pressure Differential Changes Stator Stress 1. Increased Contact ...