A horizontal single-stage pump is a type of centrifugal pump that operates with only one impeller. Here are some key features and aspects of horizontal single-stage pumps:

1. Design: These pumps have a simple design with a single impeller mounted on a horizontal shaft. The impeller rotates within a casing.

2. Functionality: They are used to transfer liquids from one location to another, typically in industrial, commercial, or municipal applications.

3. Centrifugal Action: Like all centrifugal pumps, horizontal single-stage pumps work based on the principle of centrifugal force. The rotating impeller generates centrifugal force, which pushes the fluid outward, creating a vacuum at the center, and thus, drawing fluid into the pump.

4. Horizontal Orientation: Unlike vertical pumps, which have their shafts and impellers arranged vertically, horizontal pumps have a horizontal shaft. This makes them suitable for applications where space is limited or where it's more convenient to have a horizontal layout.

5. Efficiency: Horizontal single-stage pumps are known for their high efficiency, especially when compared to some other types of pumps. They can handle a wide range of flow rates and pressures efficiently.

6. Applications: These pumps find applications in various industries such as water supply, wastewater treatment, irrigation, HVAC (Heating, Ventilation, and Air Conditioning), chemical processing, power generation, and more.

7. Maintenance: Maintenance for horizontal single-stage pumps typically involves tasks such as checking and replacing seals, bearings, and impellers, as well as ensuring proper alignment of the shaft and regular lubrication.

8. Materials: They can be constructed from various materials depending on the application and the type of fluid being pumped. Common materials include cast iron, stainless steel, bronze, and various types of plastics or composites.