Water Main calculation

[gomirage]

Hello Everyone,
Can anyone give me a good resource for calculating water main ?
A sample calculation will do.
Thank you.

 

[25362]

Section 11 of Hicks' Standard Handbook of Engineering Calculations - McGraw-Hill, may be of help. Good luck.

 

[gomirage]

hello 25362,
thank you for the information. I will look forward to get this book. Meanwhile anyone know a resource available over the net that i use to have a good idea.

than you

 

[RWF7437]

If you are trying to size the main for flow an old rule of thumb is that flow (gpm) = [diameter(inches)]^2 *10. This usually results in a velocity between 4 to 5 ft/sec.

BUT, if the line is looped or part of a larger gridded system or there are unusual flows such as fire or other high demands this is a gross oversimplification.

good luck

 

[gomirage]

The line is looped and requires use of some hardy-cross calculations.

I have a document on the method and would like to see how it has been applied to size water mains.

chris

 

[RWF7437]

If you wish to model this system you can get EPANET free from the US Environmental Protection Agency. There are also many commercial programs available but some are quite expensive. Doing these calculations by hand or with a spreadsheet is also possible but not practical for a system of more than a few pipes.

Another good reference is Analysis of Flow in Pipe Networks by Roland W. Jeppson, Ann Arbor Science Library.

If you're not familiar with these methods get a little help from some colleague who is. It will save you lots of time and aggravation.

good luck

 

[gomirage]

Thanks for your suggestions. I've tried to model it already with epanet. The things is that i want to do check and understand it by hand calculations.

Thanks a lot.

 

[RWF7437]

It is hard to reply to your post.

Are you an engineer?

If so you should have learned this in college.

If not, Please tell us where you work and why you are asking this question ?

Also, if you are an engineer, please tell us all what you are trying to do. We may be able to help but we cannot read your mind!

Better luck, but remember that the most important way to solve a problem is to state it in a way that it can be solved !

sEE YA