CW flow measurement

[brendam]

Morning. I am currently working for a 600MW power station. I actually need some help on CW flow measurements from the cooling tower to the condenser and vice versa. We currently have an Ultrasonic flowmeter but due to turbulance we are unable to get correct flow.

I have just realised that there are other techniques in the market eg Dye-dilution technique and calibration of dp transmitter. Does anybody have info on this technique or other techniques.

Your help will be appreciated

 

[ash9144]

There are dye techniques available that involve injecting dye in the unit supply then measuring time and concentration at the return.

I've seen this done with some accuracy by water treatment contractors. I would contact the company that provides your water treatment chemicals/service.

 

[dcasto]

add straighting vanes to your meters

 

[djack77494]

Turbulance should not be a problem at all. Not having fully developed flow may be. There are a variety of other instruments that would probably be suitable for this measurement. For dP, you could use an annubar. There are also vortex shedding, thermal instruments, and many others. Much depends on the line size, velocity, and available delta P.

 

[JLSeagull]

Two ultrasonic flow technologies exist. This does not sound good for Doppler. However, this seems like a good application for transit-time a.k.a. time-of-flight ultrasonic flow meter. The line must be liquid full. Entrained bubbles are problematic with older meters but newer sensors can handle some bubbles. A location flowing vertically up might improve the situation. Regardless the meter requires the same straight run as required for head flow meters to provide a fully developed flow profile. You might also look at a vortex shedder or even a mag meter. I suspect that the lines are pretty large.

 

[brendam]

Tx all for the input I will look into all this and see what best works for us