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

  • Thread starter Thread starter Johan111
  • Start date Start date
  • Tags Tags
    Suction Venturi
Click For Summary
SUMMARY

The discussion focuses on the challenges of using a Venturi for air entrainment in a centrifugal pump system with a suction pressure of approximately 2 bar and a discharge pressure of 6 to 7 bar. The user reports minimal suction from the Venturi despite having a throttling valve to adjust flow. Concerns are raised about pressure losses due to pipe bends and the diameter of the connecting pipes, which may be contributing to the low suction issue. The need for a detailed diagram of the setup is emphasized to better understand the system dynamics.

PREREQUISITES
  • Understanding of centrifugal pump operation and pressure dynamics
  • Knowledge of Venturi effect and its application in fluid systems
  • Familiarity with flow measurement techniques and pressure gauges
  • Basic principles of fluid mechanics, including the impact of pipe bends on flow
NEXT STEPS
  • Investigate the design and operation of Venturi meters for air entrainment
  • Learn about pressure loss calculations in piping systems, particularly with bends
  • Explore the effects of pipe diameter on flow rates and pressure drops
  • Research best practices for creating effective diagrams of fluid systems for troubleshooting
USEFUL FOR

Engineers, fluid dynamics specialists, and anyone involved in the design or optimization of centrifugal pump systems, particularly those integrating air entrainment techniques.

Johan111
Messages
1
Reaction score
1
TL;DR
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!
 
Engineering news on Phys.org
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?
 
Reply
  • Like
Likes   Reactions: Lnewqban and russ_watters
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.
 

Similar threads

Calibrating Pump/Venturi (Air) in a Closed Recirculating Water System
  • · Replies 1 ·
Replies
1
Views
903
How to select a pump for a venturi injector?
  • · Replies 8 ·
Replies
8
Views
4K
The Venturi Effect cannot explain how an eductor works
  • · Replies 2 ·
Replies
2
Views
4K
Design a Venturi Pump with Compressed Air and Water: Feasibility & Parameters
  • · Replies 4 ·
Replies
4
Views
4K
PD pump (Rotary lobe pump) -- loud noise
  • · Replies 5 ·
Replies
5
Views
3K
Suction side and discharge side pump pressure
  • · Replies 2 ·
Replies
2
Views
3K
Pump has a suction lift of more than 10.3 m
  • · Replies 6 ·
Replies
6
Views
8K
Water Pressure in an Isolated System
  • · Replies 2 ·
Replies
2
Views
3K
Does Diameter Reduction After Pump Cause Impeller Overexertion?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Cavitation in a closed loop pumping system
  • · Replies 9 ·
Replies
9
Views
5K