Continuous diagnostics of wastewater network – how to measure flow in narrow pipes with steep slopes.
As part of a continuous wastewater diagnostic system, what would you recommend for measuring the flow at particular points in the network?
And specifically under the following conditions:
-Small diameter pipes (from 200 to 400 mm)
-Steep slopes (from 1 to 5%)
-Varied network use (drinking water, wastewater, unitary)
Thank you in advance
Our company installed Hydreka Mainstream flowmeters.
This type of device can measure water speed and height. Parameters allow us to calibrate according to the shape of the pipe, so the transmitter can calculate flow rate.
But you have to open a window in the pipe to install the sensor.
According to the product literature, the sensor can measure height as low as 2 or 3 cm. But under these conditions, the sensor becomes an obstacle to the flow and therefore would corrupt the reading. So, how reliable is the data for a water height of 2 to 5 cm?
Our pipes have an inspection chamber, so no problem installing the sensor.
Thank you for your reply.
We have installed several of these devices, including to measure flow in mains.
To confirm the reliability, you will want to contact the manufacturer.
In the meantime, make sure the cable is properly affixed to the pipe so things like wet wipes don't get caught on it.
There is also the option of an electromagnetic flow meter that can measure flow in a partially filled pipe. But installation is more complicated. Check out ABB or Krone.