|May20-09, 12:13 PM||#1|
adjust full scale in an orifice flowmeter
I hope somebody can help me...
We are using a plate orifice to measure water feed to a reboiler; the pipeline size is 1" and the orifice was initially designed for 0-1800 kg/h of water, with a maximum pressure drop of 1000 mm water. As water feed doubles may I simply change pressure drop - by doubling the higher value of scale - to obtain water flow?
Thank you ( ang forgive for my bad english...)
|May20-09, 01:16 PM||#2|
Considering that water has virtually no viscosity and the changes in rheology due to pressure and temperature are negligible, I'd say you could assume a linear relationship between pressure drop and volumetric flow.
This is not the case for other fluids: oil-based and gases (water vapor included).
EDIT: I'm not sure what a "reboiler" is: I'm assuming that a single-phase fluid (clean liquid water) is flowing through your orifice meter. If you're dealing with more than one phase (suspended solids, gases), you won't get a reliable measurement using an orifice plate meter.
|May20-09, 02:42 PM||#3|
Ummm...the flow rate through an orifice is a function of the square root of the delta P. You might want to rethink that aspect. You will, most likely, introduce a bot more error by keeping the flow coefficient constant, but it shouldn't be a very large amount.
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