Guidelines to select diameter of pipes manually

Hi Dilip,

The answer to this question will depend on what type of system you are designing and what the performance requirements and criteria are. So we can come at this from a starting point that will be useful to you, please let us know more about the type of design exercise that you are envisaging.

Regards,
Wayne.

Hi Dilip,

The answer to this question will depend on what type of system you are designing and what the performance requirements and criteria are. So we can come at this from a starting point that will be useful to you, please let us know more about the type of design exercise that you are envisaging.

Regards,
Wayne.

Thank you for reply. I am new and i want to learn how to select diameter in simple exercise. I want to work in Hydraulics and Hydrology. I am just beginners and i haven't any materials so.

Hello Dipak,

Which software are you using?
As suggested by Wayne in his reply, please give us more details about type of project you want to design , design criteria etc. so that we can give suggestions accordingly.

Regards,
Sushma.

Thank you for reply. I am trying to learn watergems.

OK, if you are just trying to learn the software, good pipe diameters would be ones that are physically available. 2" is very small (and able to support low flow rates only) and 60" is very big and able to support very high flow rates (think enough water to supply a part of a city). The general rule would be to choose pipe sizes that do not have an excessive head-loss for the flow that is being put through them. A proxy for that value would be velocity. Too high a velocity in a pipe equates to high head-loss (more so if the pipe is rougher internally). So aim for no more than a few ft/s velocity and you are in the right ball park.

Thank you sir.