What is the difference between a single suction pump and a double suction pump?
Release time:
2021-11-24
Source:
What are the differences between single suction pumps and double suction pumps? Based on the editor's years of experience, the following points summarize this issue for a clearer understanding. Differences between single suction pumps and double suction pumps:
What is the difference between a single suction pump and a double suction pump? Based on the author's years of experience, the following points summarize this question, allowing us to understand it more clearly. The differences between single suction pumps and double suction pumps are:
1. Literally, a double suction pump draws water from both ends of the impeller, while a single suction pump draws water from the end of the impeller.
2. A double suction pump mainly draws the medium from both ends of the impeller, with a sealing chamber on each side of the impeller. It does not mean that the pump has two suction inlets. The anti-cavitation capability of a double suction pump is stronger than that of a single suction pump. When the medium is drawn from both ends of the impeller, it creates hydraulic symmetry, thus the axial thrust balance of a double suction pump is superior to that of a single suction pump, resulting in smoother operation. Additionally, due to the lower flow velocity of the medium, cavitation is less likely to occur in the impeller. However, a double suction pump has multiple sealing chambers compared to a single suction pump, making it relatively more expensive.
3. A single suction water pump, also known as an end-suction pump, has a smaller flow rate. For the same flow rate, the volume drawn in once is small but has high axial force and greater bearing load. Single suction pumps are cost-effective and widely used but are inferior to double suction pumps in many aspects. If the inlet pressure is high, generally choosing a double suction impeller can solve this issue because balancing the axial force in a single suction pump is a significant problem. The basic structure of a single suction pump consists of a high-speed rotating impeller and a fixed snail-shaped pump casing. The impeller with several backward-curved blades is fixed on the pump shaft, which rotates at high speed driven by a motor.
4. Double suction pumps are more suitable for transporting large flow rates and require smooth operating conditions. When high flow rates are required from the pump, if it is a single suction pump, it must have large inlet and outlet diameters while maintaining a stable speed around 1450 rpm. Using a double suction pump can relatively reduce the size and weight of the pump, increase speed, and improve volumetric efficiency.
5. A single suction pump means that only one side of the impeller draws water, while a double suction pump means that both ends of the impeller draw water. In other words, there are two inlets. The flow difference between both with the same diameter is not significant. We choose between two inlets or one based on on-site usage requirements. Double suction pumps have larger diameters and are more commonly used in industry.
6. Double suction types are mainly used in processes where flow rates are significantly reduced. When the flow rate of the pump exceeds 280 m3/h, with diameters over 200 mm, if using a single suction pump, the speed requirement must be around 1450 rpm to meet intake requirements. However, using a double suction pump can reduce its size and weight, increase speed, improve volumetric efficiency, thereby enhancing equipment reliability.
The above discusses the differences between single and double suction pumps. Through detailed introduction, there is also some understanding of their differences. Currently, single and double suction water pumps are widely used in municipal water supply, industrial water supply, and water treatment plants with significant effects.
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