Cantilever pumps, also known as vertical cantilever pumps or vertical submerged pumps, are a type of centrifugal pump that is designed with a vertical orientation and a single bearing support system. Unlike conventional pumps, cantilever pumps do not require a lower bearing or shaft seal, as the pump’s impeller and motor are mounted on a cantilevered shaft that extends into the fluid being pumped. The motor is typically located above the liquid level, while the impeller is submerged.

Here are some key features and characteristics of cantilever pumps:

1. Vertical Orientation: Cantilever pumps are designed to be installed vertically, with the impeller submerged in the fluid and the motor located above the liquid level. This design eliminates the need for a shaft seal and lower bearing, simplifying the pump construction and reducing maintenance requirements.
2. Single Bearing Support: Cantilever pumps use a single bearing support system, which provides stability to the shaft and impeller assembly. The bearing is typically located at the top of the pump, where it supports the cantilevered shaft.
3. Immersed Impeller: The impeller of a cantilever pump is submerged in the fluid being pumped. This design allows the pump to handle slurries, liquids with high solids content, and corrosive or abrasive fluids.
4. Solids Handling Capability: Cantilever pumps are capable of handling fluids with significant solids content, including large particles and abrasive materials. They are commonly used in applications such as mining, dredging, and wastewater treatment, where solids need to be efficiently transported.
5. Low NPSH Requirements: Cantilever pumps typically have low net positive suction head (NPSH) requirements, which means they can operate effectively in applications with limited suction conditions.
6. Easy Maintenance: The vertical design of cantilever pumps simplifies maintenance and inspection. As the motor is located above the liquid level, it is easily accessible for servicing, while the absence of a lower bearing and shaft seal reduces maintenance needs.

Cantilever pumps are commonly used in challenging applications where conventional pumps may face difficulties, such as pumping slurries, liquids with high solids content, or corrosive fluids. Their design allows for efficient pumping of these challenging fluids while reducing maintenance requirements.

When selecting a cantilever pump, factors such as flow rate, head requirements, fluid properties, solids content, and system compatibility need to be considered. Manufacturers’ guidelines and recommendations should be followed for proper installation, operation, and maintenance to ensure optimal performance and reliability of cantilever pumps.

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