Flow measurements
Flow measurements
(OP)
Hi, does anyone know the best flow measurement device for water without using turbine or ultrasonic ones. We need this device for 600 l/s, 1500 l/s, 750 l/s, 150 l/s. The water came from a river. The main problem is that we want to use one that allow us the minor distance required (for less measurement errors) between this flowmeter device and the nearest accessories (elbows, tees). Thanks in advance





RE: Flow measurements
http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=magnetic+flow+meters+magmeter
RE: Flow measurements
The company (McCrometer) claims that straight runs of pipe requirements are minimun.
I´ve seen these flowmeters installed in a gas conditioning plant and seems to work good, but you should ask for other references.
The link is:
http://www.mccrometer.com/products/pdvcone.htm
Hope this help.
RE: Flow measurements
Table II tabulates straight run pipe requirements upstream/downstream as multiple of pipe diameter.
The following types of flow meters have no straight run requirement at all according to the table (can have obstruction immediately upstram and downstream): mag flowmeters, mass flowmeters, metering pumps, positive displacement gas meters, positive displacement meters, variable area flow meters. (I am a little surprised about mag flowmeters... I though they had a 5D requirement.)
Some others with lower requirements (upstream/downstread diameters):
thermal meters 5/3
Turbine flowmeters 10/5
vortex flowmeters 15/5
etc
The accuracy is also tabulated on same table along with several other application selection criteria.
RE: Flow measurements
RE: Flow measurements
electricpete has given a good idea of flow straighteners. You can use corriliolis mass flow meters for better accuracy and shorter straight lengths. (I have seen installations where they are put immediately after bends)
But they are expensive. By the way what accuracies you require and what are the pipeline sizes?
Regards,
RE: Flow measurements
RE: Flow measurements
As I need not tell you, you can use localised velocities of upto 8 m/s for water application for measuring applications. Any comment on it?
Regards,