measuring flow in partial filled pipes

Dear,

Pipe size is 1200mm and I need to install sensor for measuring flow, I check krohne and Toshiba for electromagnetic flowmeter for partial filled pipes, maximum pipe size is 1000mm for krohne and maximum pipe size for Toshiba is 600mm, so it is not possible to use electromagnetic flowmeter for either Krohne or Toshiba.

one of the solution that can be used is from the below

https://vimeo.com/69531544
where it uses top and side sensors (ultrasonic for top and velocity for side) however, looking at the flow sensor chamber, the velocity sensor on the side seems it doesn't fit.

attached are the flow sensor chamber, appreciate any feedback on this issue.

thank you!

Charbel

My system does not allow access to vimeo.

But what about using a low-cost radar unit to measure the level in the pipe, and from there, calculate the flow?
I was talking to the local Endress & Hauser rep about this yesterday, although I do not have an application at the moment.

Sounds like it could be a good application for an orifice plate and a differential pressure transmitter

For a partially full pipe you need both depth of fluid and velocity. There are meters out there that do that:

http://www.mcrt.com/partially-filled-flowmeter.html
https://www.aquatechnologygroup.com/partially-filled-pipe-flow-measurement/

Another option is to use an inverted siphon (a down pipe, a full horizontal length, and then back up again) and a conventional flow meter. http://www.lmnoeng.com/Channels/InvertedSiphon.php

Metering manholes are another solution, with a weir and level measurement.

seems like a pd meter would be your best bet.

Open channel flow and partially full pipe flow are common in water and wastewater systems. Sewers are a prime example of partially full pipe flow. They present a special challenge because the components of the equation Q=VxA,the basis of most full pipe flow meters, are difficult to determine. A is a function of how deep, which is a function of flow rate and slope of the pipe, which also influence V.

Orifice and similar common flow meters don't work. Positive displacement meters are generally too small, would foul and fail in sewage, and generally require some head loss, which isn't available.

The attached shows an example of partially full pipe flow measurement. http://www.teledyneisco.com/Documen...Meter Redundant Flow Measurement App Note.pdf