How to select axial flow pumps
There are a range of things to consider when selecting Axial Flow pumps such as key specifications as well as what material is required for your application.
Specifications to consider when selecting Axial Flow pumps:
- Flow rate:The flow rate and the rated capacity of pumps must match for smoother operation.
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Pressure: As in the case of all centrifugal pumps, the pressure in axial flow pumps varies based on the pumped fluid's specific gravity.
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Head: Referring to the height above the suction inlet that a pump can lift a fluid, and tends to be expressed as a column height of water given in feet (ft) or meters (m).
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Net positive suction head (NPSH): This is the difference between the pump's inlet stagnation pressure head and the vapor pressure head. The required NPSH is an important parameter in preventing pump cavitation.
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Output power: Refers to the power actually delivered to the fluid by the pump, and is measured in horsepower (hp).
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Input power: Refers to the power that needs to be supplied to the pump, and is measured in horsepower (hp).
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Efficiency: Which refers to the ratio between the input power and output power, which generally describes how much of the input power does useful work.
Selecting materials
- Cast iron provides high tensile strength, durability, and abrasion resistance corresponding to high pressure ratings.
- Steel and stainless steel alloys provide protection against chemical and rust corrosion and have higher tensile strengths than plastics, corresponding to higher pressure ratings.
