Flow Away in Force Main Calculations
Flow Away in Force Main Calculations
(OP)
I'm sure this question has been discussed before but I didn't find exactly what I was looking for so I figured I'd just post again. Feel free to direct me to a previous post.
Consider a force main with multiple high points. Also assume that one particular high point to low point is 40 feet (elevation difference). A hazen-williams calculation along that same section of pipe for the design flow, shows a friction loss of 25 feet. Am I able to subtract the balance (15 feet of head) from the next low-point to high-point TDH calculation?
I intend to work out the hyraulics of it later this week, just thought I'd see if anyone had a layman's response.
Thanks!
Consider a force main with multiple high points. Also assume that one particular high point to low point is 40 feet (elevation difference). A hazen-williams calculation along that same section of pipe for the design flow, shows a friction loss of 25 feet. Am I able to subtract the balance (15 feet of head) from the next low-point to high-point TDH calculation?
I intend to work out the hyraulics of it later this week, just thought I'd see if anyone had a layman's response.
Thanks!





RE: Flow Away in Force Main Calculations
RE: Flow Away in Force Main Calculations
What you are describing is essentially ignoring any benefit from gravity flow in the force main, correct?
RE: Flow Away in Force Main Calculations
RE: Flow Away in Force Main Calculations
However, you pump must have the necessary power to initially push the water over the summit. Once opeating, the hp will drop as you recover the energy. If you do not add the extra power to the pump, you may not be able to push the water over the summit.
RE: Flow Away in Force Main Calculations
You need to draw the hydraulic profile and the pipe profile to make any sense of it.
RE: Flow Away in Force Main Calculations
RE: Flow Away in Force Main Calculations
The problem that may occur in pipelines is entrapment of air or air pockets. The remedy for this is to ensure that the pumped fluid has adequate velocity that will force the entrapped air out of the pipeline.
RE: Flow Away in Force Main Calculations
RE: Flow Away in Force Main Calculations
Where depressions deeper than 50m had to be crossed, the Romans also used pressurized pipelines called inverted siphons. Modern hydraulic engineers use the same techniques to enable sewers and water pipes to cross depressions.
RE: Flow Away in Force Main Calculations
RE: Flow Away in Force Main Calculations
RE: Flow Away in Force Main Calculations
RE: Flow Away in Force Main Calculations
RE: Flow Away in Force Main Calculations