Effects of Increasing Header Pipe Diameter in Water Distribution

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In summary, the conversation discusses the potential effects of increasing the diameter of a header pipe in a water distribution line, specifically the possible decrease in pressure at the discharge pipe. The expert suggests that with the same volumetric flow, a larger diameter pipe would result in less fluid velocity, leading to a decrease in pressure. However, if the system allows for more flow, the velocity and pressure may remain the same. The conversation also mentions the capacity and type of pumps being used and the potential impact on discharge pressure. The desired result is to evaluate the difference between a 10 and 20 inch diameter header and determine if the change was beneficial for discharge pressure.
  • #1
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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  • #2
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.
 
  • #3
kindly see attached diagram.. thank you..

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

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  • #4
kindly see attached diagram.. thank you..

each pump has a capacity of 2,200 gpm at 180 ft head..
 
  • #5
I assume they are centrifugal and not positive displacement?
 
  • #6
yes.. centrifugal pumps..
 
  • #7
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?
 
  • #8
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.
 

FAQ: Effects of Increasing Header Pipe Diameter in Water Distribution

What is the purpose of increasing the header pipe diameter in a water distribution system?

The main purpose of increasing the header pipe diameter is to improve the flow rate and water pressure in the system. This can help to reduce water loss and improve efficiency in delivering water to consumers.

How does increasing the header pipe diameter affect the water distribution system?

Increasing the diameter of the header pipe can have several effects on the water distribution system. It can improve flow rate and pressure, reduce water loss, and increase the capacity of the system to handle higher demand.

What factors should be considered when deciding to increase the header pipe diameter?

Several factors should be taken into account when considering increasing the header pipe diameter. These include the current flow rate and pressure, the size and layout of the system, and the potential costs and benefits of the change.

What are some potential challenges or drawbacks of increasing the header pipe diameter?

One potential challenge of increasing the header pipe diameter is the cost and disruption of replacing existing pipes. Additionally, if the system is not designed properly, increasing the diameter may not have the desired effects and could lead to issues such as increased water hammer and higher maintenance requirements.

Are there any alternatives to increasing the header pipe diameter for improving water distribution?

Yes, there are alternative methods for improving water distribution that may be more suitable depending on the specific system. These include installing booster pumps, implementing pressure management systems, and improving maintenance and repair processes.

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