flow rate measurement
flow rate measurement
(OP)
I have 110mm pipe that is receiving outlet wastewater from a treatment system. the flow is continuous but can be zero at times but mostly continuous, It varies constantly diurnal mainly and is very low. I am looking for an alternative way to measure the flow rate of water from the pipe without the use of a flow metre.





RE: flow rate measurement
Is there a way to measure any other variable that is dependent on flow - e.g. the time required to fill/empty certain volume etc.?
Dejan IVANOVIC
Process Engineer, MSChE
RE: flow rate measurement
RE: flow rate measurement
Dejan IVANOVIC
Process Engineer, MSChE
RE: flow rate measurement
RE: flow rate measurement
Dejan IVANOVIC
Process Engineer, MSChE
RE: flow rate measurement
RE: flow rate measurement
http://www.plasti-fab.com/portfolio-items/trapezoi...
RE: flow rate measurement
RE: flow rate measurement
The permutations and ideal systems are endless, but give us a bit more data here please:
What is your max / normal flowrate / velocity?
Is the pipe always full or sometimes / mostly partially full? - makes a huge difference in what works or doesn't work
Pressure?
lengt of pipe
Is pipe flat or sloping down?
Room to fit any device?
simple way is just a three way valve into a known volume and time how long it takes to fill said known volume or time it and then measure contents - then revert back to normal flow and drain volume back into the line.
Or just put a bucket under the end?
You tell us how sophisticated you want this be.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: flow rate measurement
You might want to look into an external "Ultrasonic Flow meter".
https://www.google.com/#q=external+flow+meter
Sometimes its possible to do all the right things and still get bad results
RE: flow rate measurement
The pipe is never full maybe a quarter way full, it is on a flat surface, a bucket cannot be used since the depth between the pipe and water surface is low as shown in the diagram. the flow rate is approximately 0.47m3/hour, worse case 0m/hour, minimum 0.06m3/hour highest 1.03m3/hour.
RE: flow rate measurement
RE: flow rate measurement
sandcounter,i know ballistics for a projectile are they any for flow in a pipe? and since the height in the pipe is always varying would they work?
RE: flow rate measurement
Do a search on this site on "open channel flow measurement" and things like this crop up - http://www.eng-tips.com/viewthread.cfm?qid=400406
Try looking up V notch flow meters.
Look like they could be the right sort of thing, but again you will need a fairly accurate height measurement.
Something like this maybe? http://soil.co.uk/products/water-monitors-piezomet...
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: flow rate measurement
RE: flow rate measurement
The manufacturer publishes flow rates for various configurations.
Ted
RE: flow rate measurement
RE: flow rate measurement
The Trapezoidal Flume would not fit in a pipe, but would replace a pipe segment. It is similar to the parshall flume but more compact.
http://openchannelflow.com/blog/trapezoidal-flumes...
The Trapezoidal Flume works well with lower flows, has little head loss, and is compact.
http://openchannelflow.com/blog/trapezoidal-flumes...
RE: flow rate measurement
For something online you would need some instruments like we-ve all just been discussing. You could build a small weir / V notch meter in that pit.
Bimr - that's a nice looking piece of kit. I'll have to remember that one.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: flow rate measurement
e.g. http://www.omega.co.uk/prodinfo/magnetic-flow-mete...
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: flow rate measurement
Here is outflow flow rate chart from Rissy.
Ted
RE: flow rate measurement
The upper level defines a known volume. Count the number of 'empty' operations, multiply that number of empties by known volume to get total volume.
The error is the in-flow during an empty process, which is not part of the volume when the empty is initiated.
RE: flow rate measurement
FYI
For a draw down of 17 inches(.43m) the average flow rate for a 4-inch outlet is 140 gpm (.0089m^3/sec).
Ted
RE: flow rate measurement