Sanlian Pump Industry Group is a manufacturing enterprise based on water supply and drainage equipment. The group company integrates R&D, design, casting, production and sales, and provides customers with modern, digital and intelligent comprehensive solutions for fluid transportation and integrated systems.
Since its establishment in 1957, Sanlian Pump Industry has established more than 30 offices around the world with the continuous expansion of its business. With more than 500 technical personnel, it has long been committed to providing high-quality services to domestic and foreign customers.
Since its establishment in 1957, Sanlian Pump Industry has established more than 30 offices around the world with the continuous expansion of its business. With more than 500 technical personnel, it has long been committed to providing high-quality services to domestic and foreign customers.
Sanlian Pump Industry is a key enterprise in China's pump industry, a member of the China General Machinery Association, and a vice-chairman unit of the Pump Industry Association.
Mixed flow pumps are widely used in industries that require high flow rates at moderate heads. Bridging the gap between axial flow and radial flow pumps, these pumps combine the characteristics of both to provide efficient fluid movement in applications like irrigation, flood control, cooling water circulation, drainage systems, and certain chemical processes. Selecting the right mixed flow pump is crucial for ensuring system efficiency, minimizing operational costs, and avoiding mechanical failure.
A mixed flow pump is a type of centrifugal pump in which the fluid experiences both radial and axial motion as it passes through the impeller. Unlike radial flow pumps, which push liquid perpendicular to the shaft, or axial flow pumps, which move it parallel to the shaft, mixed flow pumps combine these directions to deliver high volume at medium head.
They are typically used in:
Understanding the specific conditions of your application is the foundation of pump selection. Important factors include:
Determine the required flow rate in gallons per minute (GPM) or cubic meters per hour (m³/h). Mixed flow pumps are ideal for applications needing high flow, often exceeding 10,000 GPM.
This includes static lift, pressure head, and friction loss in the piping system. Mixed flow pumps typically operate within a moderate head range (10 to 100 meters).
Evaluate the nature of the liquid (clean, dirty, corrosive), presence of solids, ambient conditions, and installation site accessibility. These factors influence the pump’s design and material selection.
Mixed flow pumps typically feature open or semi-open impellers that create both axial and radial flow. The impeller must be matched to the required flow/head conditions for optimal efficiency.
Ensure the suction piping minimizes air entrainment and turbulence. The discharge piping should accommodate flow without excessive friction losses.
Always examine the pump performance curve provided by the manufacturer, which plots head vs. flow rate, along with efficiency, NPSHr (Net Positive Suction Head Required), and power consumption.
Select a pump that operates near its BEP for the given flow and head. Running too far off BEP can cause vibration, noise, premature wear, and reduced reliability.
Ensure that the system provides adequate NPSH available (NPSHa) above the NPSHr to prevent cavitation, which can damage the impeller and reduce pump life.
Construction Materials
The pump's wetted components must be compatible with the pumped fluid. Common materials include:
Consider chemical compatibility, wear resistance, and expected fluid temperature when choosing materials.
Drive and Power Considerations
Ensure the motor power aligns with the pump's required shaft power. Oversized motors can waste energy, while undersized motors may fail under load.
Using a VFD can improve operational flexibility by adjusting pump speed to meet varying demand. This helps optimize energy consumption and reduce mechanical stress.
Maintenance and Serviceability
Choose a pump design that allows for easy inspection, impeller replacement, and bearing maintenance. Vertical pumps with pull-out rotors or horizontal split-case designs can simplify maintenance routines.
Select appropriate bearing arrangements and shaft seals (mechanical seals or packing) based on pressure, temperature, and fluid characteristics.
Confirm the availability of critical spare parts and whether the manufacturer offers service support in your region.
Installation and Footprint
Mixed flow pumps, particularly in large-capacity applications, require sufficient space for installation and servicing. Vertical pumps save floor space but may require overhead lifting equipment. Horizontal pumps are easier to maintain but need more floor area.
Ensure a solid foundation to support the pump’s weight and operational loads, along with proper alignment of motor and pump shaft to avoid excessive vibration.
Environmental and Regulatory Compliance
In municipal or industrial applications, mixed flow pump systems may need to comply with environmental standards, noise regulations, and energy efficiency mandates. Choose pumps certified by relevant standards such as ISO, ANSI, or API when necessary.
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