Is a Venturi Suction the Solution for Low Pressure in a Centrifugal Pump System?

In summary, the conversation discusses the use of a venturi across a centrifugal pump to inject air into the suction side and the impact of bends and pipe diameter on suction pressure. The speaker also requests a sketch and pressure measurement for further analysis.
  • #1
Johan111
1
1
TL;DR Summary
I have suction problems on a venturi connected across a centrifugal pump.
Good day

I am trying to use a venturi across a centrifugal pump. The pressure at suction side is about 2 bar and the discharge pressure about 6 to 7 bar. This pump supply drippers and the delivery is about 180 cub/h. I need to inject entrainment air into the suction side and try to use a venturi across the high (discharge) and low (suction) pressure sides of the pump.

I get little to no suction on the venturi. I have a throttling valve to play around with the flow through the venturi. The setup have also quite a lot of bends.

Can the low suction be the pressure loss on these bends and relative low diameter pipe between the high and low pressure.

Thank you for feedback!
 
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  • #2
A bit difficult to say what happens here... do you have a sketch of the setup that shows what's going on, with some dimensions? Do you have a measurement of the pressure at the Venturi throat?
 
  • Like
Likes Lnewqban and russ_watters
  • #3
A diagram would definitely help, but I can't envision how a Venturi for air entrainment could be added anywhere in a system like this.
 

1. What is a Venturi suction?

A Venturi suction is a type of suction device that uses the Bernoulli principle to increase the speed of a fluid, thereby decreasing its pressure. It is commonly used in centrifugal pump systems to improve the suction performance and overcome low pressure issues.

2. How does a Venturi suction work?

A Venturi suction works by creating a constriction in the flow of a fluid, causing it to accelerate and decrease in pressure. This decrease in pressure creates a suction effect, which helps to draw fluid into the pump and improve its performance.

3. When is a Venturi suction used in a centrifugal pump system?

A Venturi suction is typically used in centrifugal pump systems when there is a low pressure issue, such as when the fluid being pumped is too viscous or when the pump is located at a higher elevation than the fluid source. It can also be used to improve the overall efficiency of the pump.

4. Are there any drawbacks to using a Venturi suction?

While a Venturi suction can be effective in improving the performance of a centrifugal pump system, it also has some drawbacks. It can increase the energy consumption of the pump and may require regular maintenance to ensure proper functioning.

5. How can I determine if a Venturi suction is the right solution for my low pressure pump system?

The best way to determine if a Venturi suction is the right solution for your low pressure pump system is to consult with a professional engineer or pump specialist. They can assess your specific system and make recommendations based on its unique needs and requirements.

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