Flow calc help: non-pressure, tortuous path + pipe size reduction
Flow calc help: non-pressure, tortuous path + pipe size reduction
(OP)
Open channel flow:
I have a 12" corrugated steel pipe with known flow, Manning's n value 0.010, slope = 0.02.
I need to connect a 10" inner diameter HDPE (n = 0.012) that has three 90 degree bends... on a 0.1 slope to the end of the 12" pipe.
I'm looking for suggestions on how to tell if the smaller/smoother pipe will accomodate the flow or back up the flow. Can I just use a Manning's comparison...or do I have to take into account the pipe length/bends?
Thanks,
Evan
I have a 12" corrugated steel pipe with known flow, Manning's n value 0.010, slope = 0.02.
I need to connect a 10" inner diameter HDPE (n = 0.012) that has three 90 degree bends... on a 0.1 slope to the end of the 12" pipe.
I'm looking for suggestions on how to tell if the smaller/smoother pipe will accomodate the flow or back up the flow. Can I just use a Manning's comparison...or do I have to take into account the pipe length/bends?
Thanks,
Evan





RE: Flow calc help: non-pressure, tortuous path + pipe size reduction
you need to confirm if the steeper downstream pipe hydraulic control is a)at the inlet b)not at the inlet but further down
that will require calculation of bend losses, outlet losses and friction losses plus transition losses at the connection point
RE: Flow calc help: non-pressure, tortuous path + pipe size reduction
Thanks
RE: Flow calc help: non-pressure, tortuous path + pipe size reduction
RE: Flow calc help: non-pressure, tortuous path + pipe size reduction
RE: Flow calc help: non-pressure, tortuous path + pipe size reduction
RE: Flow calc help: non-pressure, tortuous path + pipe size reduction
1) flows over a weir and dumps down...into a confined area where it...
2) flows into 12" dia corrugated metal pipe, n = 0.022, design Qin = 134.4 cfm, slope = 2%, length = 47'
3) Transition to 10" dia HDPE, slope = 10%, n = 0.012, slope = 10%...goes a couple feet & then left hand 90, goes a few feet & then right hand 90, goes a foot or two & then right hand 90, goes several feet & discharges into a drain box from an elevation (never submerged exit).
RE: Flow calc help: non-pressure, tortuous path + pipe size reduction