Thanks for you input!
I am more interested in the gas water phase of sewer mains.
When the sewer main stops pumping air goes to the high puts and starts corroding it. When the pump starts again i need to know weather the flow will be enough to pump out the air bubble from the high point
hey,
i need to find some equations which predict where corrosion will occur in a pressure main. I understand that corrosion occurs at the high points but not always.