Effects of Increasing Header Pipe Diameter in Water Distribution

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Discussion Overview

The discussion revolves around the effects of increasing the diameter of a header pipe in a water distribution system. Participants explore the implications for pressure and flow characteristics, considering both theoretical and practical aspects of fluid dynamics.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant suggests that increasing the diameter of the header pipe may lead to a decrease in pressure at the discharge pipe, but seeks justification for this claim.
  • Another participant posits that with the same volumetric flow, a larger diameter results in lower fluid velocity, which could lead to reduced pressure due to the relationship between pressure and velocity.
  • There is a consideration that if the system allows for increased volumetric flow with the larger diameter, the velocity and pressure may remain unchanged.
  • A participant questions whether the pumps in use are centrifugal or positive displacement, confirming they are centrifugal pumps.
  • One participant argues that if the discharge lines remain unchanged, the overall head should not differ significantly, despite potential changes in pressure within the header due to friction losses.
  • The original poster seeks to evaluate the difference in discharge pressure between a 10-inch and a 20-inch diameter header, noting that the change was made for unspecified reasons.

Areas of Agreement / Disagreement

Participants express differing views on the impact of increasing the header pipe diameter on discharge pressure, with no consensus reached on the overall effects or outcomes of such a change.

Contextual Notes

Participants discuss assumptions regarding flow rates, pump types, and the relationship between velocity and pressure, but do not provide definitive conclusions or resolutions to the questions raised.

Who May Find This Useful

Individuals interested in fluid dynamics, water distribution systems, and the practical implications of pipe sizing may find this discussion relevant.

balotpinoy
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kindly help me with this one.

im trying to find out what is the effect if i increase the diameter of my header pipe in a water distribution line.

i think pressure at the discharge pipe will decrease. if so, i don't know how to justify it.

tnx in advans.
 
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Assuming the same volumetric flow, you will have less fluid velocity. Pressure changes in proportion to the square of the velocity, so you will have less pressure with a lower velocity.

But if you open it up and the system allows more volumetric flow, you may see the same velocity/same pressure.
 
kindly see attached diagram.. thank you..

each pump has a capacity of 2,200 gpm at 180 ft head..
 

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kindly see attached diagram.. thank you..

each pump has a capacity of 2,200 gpm at 180 ft head..
 
I assume they are centrifugal and not positive displacement?
 
yes.. centrifugal pumps..
 
If your header discharge are still the same, I don't think you should see much of a difference. The pressure within the header will decrease so you'll get the benefit of the friction losses there, but you'll probably lose that at the discharge lines due to the reduction and change of flow velocity. Bottom line, if the discharge lines are the same, then you should still be about the same head.

What is the desired result?
 
im just trying to evaluate the difference between having a 10 or 20 in diameter header.

the first set up was 10 inches diameter header and it was changed to 20 inches due to unknown reasons.

i just want to know if that change actually help in terms of the discharge pressure.

thank you again.
 

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