Fluid Mechanic - Pressure in the pipe

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Discussion Overview

The discussion revolves around calculating the pressure at the intersection of three centrifugal pumps discharging into a single pipe. It explores the factors influencing pressure in fluid mechanics, particularly in pump systems.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about the considerations for calculating pressure at the intersection of three pumps flowing into one pipe.
  • Another participant suggests that the pressure at the intersection will be close to the discharge pressure of any of the pumps and raises questions about the symmetry of the pipe discharges and the availability of pump curves.
  • A participant provides flow rate information, stating that each pump has a flow rate of 350 m3/hour and questions the feasibility of this setup.
  • Another participant challenges the feasibility of determining pressure solely based on flow rate, emphasizing the need for pump curves to ascertain overall system pressure.

Areas of Agreement / Disagreement

Participants express differing views on the ability to calculate pressure at the intersection based solely on flow rates, indicating a lack of consensus on the methodology for determining pressure in this scenario.

Contextual Notes

Participants highlight the importance of additional information, such as pump curves and pressure readings, which are necessary for a complete analysis but remain unresolved in the discussion.

Arian DP
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What should I consider if I have three centrifugal pumps then the water of these three pumps flow into one pipe? How to calculate the pressure in the intersection of the three pipes?Thank You.
 
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The pressure at the intersection will be very close to the pressure at the discharge of any of your three pumps.

Are the pipe discharges from the pumps symmetrical (or similar) to the header (intersection)?
Do you know the flow rate of each pump (or the combination?)
Do you have a pump curve for the pumps? (if not ask the manufacturer)
Do you have any pressure readings the the pipe anywhere?
 
The flow rate for three pumps are similar, 350m3/hour. And the diameter of pipe is 350 mm. Is it possible?
 
Is what possible?

There is no way to mathematically determine the pressure at a given point in a pump system with just the flow rate. My question about the flow rates was leading toward the next question, do you have the pump curves for the centrifugal pumps. If they are putting out 350 m3/hr, then you need only look at the curves to determine the overall system pressure. You can work your way back from there.
 

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