Which flow meter will be applicable to be used for sewage application in underground pipeline for flowrate and flow level measurement in Gravity flow? Tapping is not allowed.
Depends on the type of underground pipeline and what the size of the line is, and what the conditions are.
What is the pipe size?
What is the maximum flow rate?
What is the minimum flow rate?
Is there a manhole?
Is the pipe surcharging? That is, does the pipe backfill with liquid?
Is there reverse flow?
There are a variety of devices that have been developed for sewer flow monitoring, including the one the team I was on won an R&D100 award for. But the reason for the variety is that there is no "flowmeterprince charming" for open channel flow in sewers.
Walt
Walt Boyes, FInstMC, Chartered Measurement and Control Technologist
Life Fellow, International Society of Automation
Editor in Chief, Control and ControlGlobal.com [email protected]
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Mag meters may work. Krohne, ABB and others make mag meters that operate in partially filled pipes. But mag meters may not work. It depends on what the conditions are. People often make the mistake of selecting a flow or level technology and then trying to fit the application into the operating envelope of the device.
Walt
Walt Boyes, FInstMC, Chartered Measurement and Control Technologist
Life Fellow, International Society of Automation
Editor in Chief, Control and ControlGlobal.com [email protected]
It does, if there is enough headroom for the sensor plus blanking distance; if there is a primary device in the line such as a flume or weir; or if the coefficient of roughness and slope are known well enough to make the reading better than +/- 25%; and if there is neither surcharging (flooding) or reverse flow.
Once again, I encourage the asker of the question to give us the information on the application so we can actually see what devices will or will not work _in this specific case_.
Walt
Walt Boyes, FInstMC, Chartered Measurement and Control Technologist
Life Fellow, International Society of Automation
Editor in Chief, Control and ControlGlobal.com [email protected]
I need to measure flow for sewer lines that has gravity flow of 0.6-1.6m/s and the volume of flow range between .58m cube - 1.5m3/hour. the pipe size is 110mm PVC. what is the best flow meter that can be used for this purpose as i also need a pulse signal to control valves as per the amount of flow? I have asked several manufacturers of magnetic flow meters but with no success...is there anyone that can assist me with a choice?
Once you read this, if you need more advice, come back and tell us what you need.
Beware of surcharge and reverse flow, and make sure your sewer is clean at your measurement point and for several diameters upstream and downstream.
Good luck,
Walt
Walt Boyes, FInstMC, Chartered Measurement and Control Technologist
Life Fellow, International Society of Automation
Editor in Chief, Control and ControlGlobal.com [email protected]