Calculate Water Pressure & Design Energy Dissipator

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Discussion Overview

The discussion revolves around calculating water pressure in a pipeline system and designing an energy dissipator for water flowing from a higher elevation tank to a lower elevation tank. It encompasses theoretical calculations, practical design considerations, and the implications of flow rates and velocities.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Mathematical reasoning
  • Experimental/applied

Main Points Raised

  • One participant notes that the static water pressure difference can be calculated, but further details depend on pipe dimensions and flow rates.
  • Another participant suggests that dissipating kinetic energy is necessary and questions the required final velocity of the water entering the lower tank.
  • A different participant mentions the use of vertical baffle walls in the tank and seeks advice on executing an energy dissipator at the pipe outlet.
  • One suggestion includes using an ordinary regulator, prompting a request for specific flow rate and pressure details.
  • A participant emphasizes the importance of permissible velocity, suggesting that reducing velocity can be achieved by flaring the pipe before entry, proposing a specific geometric ratio for the flare.

Areas of Agreement / Disagreement

Participants express differing views on the design of the energy dissipator and the specifics of flow rates and velocities. There is no consensus on the best approach to dissipate kinetic energy or the exact parameters needed for the design.

Contextual Notes

Participants have not provided details on the permissible velocity or specific design constraints for the energy dissipator, which may affect the proposed solutions.

Who May Find This Useful

Engineers and designers working on fluid dynamics, hydraulic systems, or water management projects may find this discussion relevant.

env
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Assuming water is flowing from tank A (Elevation 1000m) to tank B(Elevation 800m) through a water pipeline. How can I calculate the water pressure going out from the pipe to tank B and how can I design energy dissipator?
 
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You can only tell the static water pressure difference, from the info you have given. Everything else would depend upon the pipe dimensions and the actual rate of flow. It looks as though you want to dissipate the Kinetic Energy of the water as it enters the lower tank. How slow do you need the water to end up? Wouldn't a simple set of baffles at the inlet to the lower tank be good enough? Or is there more to this question?
 
Hi sophiecentaur,
Thank you for your reply. As you mentioned I need to dissipate the kinetic energy. My tank consists of some vertical baffle walls. I guess that we need to execute energy dissipator at the outlet of the pipe (tank inlet) to dissipate this energy. Do you have an idea how to do it?
 
How about an ordinary regulator? What is the flow rate and pressure (inlet and outlet) we're dealing with here?
 
flow=3000cum/hr
static pressure=20 bar
 
You haven't said what is the permissible velocity - it cannot be zero, either in a steady state or during a one-off filling of the bottom tank. You could reduce the velocity significantly at the tank input by flaring the pipe before the entry. The velocity would be proportional to 1/cross sectional area so a 1:10 cone would reduce velocity to 1/100 of original. Could this be fabricated?
 

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