Pressure in pipe and find leakage

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    Leakage Pipe Pressure
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Discussion Overview

The discussion revolves around a problem involving two pipes of different diameters (100mm and 150mm) in a square pipeline configuration. Participants explore questions related to pressure distribution in the pipeline when filled with water, the effects of a leak in the 100mm pipe, and methods for calculating pressure differences and flow rates.

Discussion Character

  • Exploratory
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant questions whether the pressure is the same throughout the pipeline when filled with water and without any leaks or supply.
  • Another participant suggests that if there is no leak and no flow, the pressure will be uniform, but if there is flow, the pressure in the 150mm pipe may be higher, while the flow speed in the 100mm pipe will be greater.
  • Concerns about pressure losses due to friction in a long pipeline are mentioned, with a reference to the Hazen-Williams equation for calculations.
  • A participant proposes a method to determine leak rates by manipulating flow through various outlets and measuring the differences in flow rates.
  • There is a suggestion to conduct a practical measurement of the leak by collecting water in a bucket over a minute to obtain accurate data.

Areas of Agreement / Disagreement

Participants express differing views on the pressure dynamics in the pipeline, particularly regarding the effects of flow and leaks. There is no consensus on the best approach to calculate pressure differences or the implications of opening multiple outlets simultaneously.

Contextual Notes

The discussion does not clarify certain assumptions about the pipeline configuration or the specific conditions under which the pressure calculations are made. The implications of friction and flow dynamics remain unresolved.

Who May Find This Useful

Individuals interested in fluid dynamics, pipeline engineering, or those working on practical applications involving fluid flow and leak detection may find this discussion relevant.

darren000
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Could someone please help me with this??

I am working on a problem with 2 pipes, one 100mm and one 150mm in diameter. The shape of the pipeline is a square. half is 100mm pipe and the other half is 150mm pipe.

1.If entire pipeline is filled with water, no leak and no supply, is pressure the same through out the pipeline?

2. If no supply, and there is a leak point on the 100mm pipe at a rate of 1 L/min. what formula should I use to calculate the pressure difference?
 
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if you could be more clear on how the pipeline looks I think I could be able to help but I do not know what the pipeline looks like at all...
 
Thanks for your reply WillemBouwer.

The pipe network is attached. As you can see, water comes in from supply and goes out to E if all other outlet are shut off.

1. My first approach is to find Leak 1 and Leak 3 by closing A and C. Then flow rate in - flow rate out = flow rate leak. Is my though correct? I assumed leak 1 and leak 3 are minor leaks.

2. Known Leak 3 and Leak 1, I will close B and open A,C,D and assume no other leaks exist. Then I can measure leaks on the left side of A if they are opened.

Please let me know if I'm on the right track or not.
Thanks You. Appreciated.
 

Attachments

If there is no leak and no flow the pressure will be the same, if there is flow theoretically the pressure in the 150mm pipe will be larger but the speed in the 100mm pipe wil be more. If it is a long pipeline the friction will account for some pressure losses if there is flow, which can be calculated using the Hazen-Williams equation.
Yes that thought process will be correct for that specific piece of the pipeline... However, if you open A and B simultaneously what will the flow in both the pipelines be? Is this a real live scenario? If it is, just take a measuring bucket and let the leak flow into the bucket for one minute and see what the volume of the water is... This is the most accurate approach you can have...
 
Thanks for your reply.

I assume if both A and B opens water will flow both ways, I will update on this tomorrow.
This is for simulation purpose. Connecting all the sensors to PLC and monitor them through a display.

Best Regards
 

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