straight run for orifice flow meter
straight run for orifice flow meter
(OP)
why in down stream to the orifice also straight run is required? thanks in advance
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straight run for orifice flow meter
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RE: straight run for orifice flow meter
There is detailed information in API MPMS Chapter 14.3. See also http://asgmt.com/wp-content/uploads/pdf-docs/2009/... and http://www.flowcontrolnetwork.com/flowmeter-piping...
Dejan IVANOVIC
Process Engineer, MSChE
RE: straight run for orifice flow meter
RE: straight run for orifice flow meter
RE: straight run for orifice flow meter
RE: straight run for orifice flow meter
I've always thought that the downstream distances in 14.3 were far too long, but without any downstream straight pipe (e.g., attaching a 90 elbow to the outlet of the meter) the stagnant flow areas in the downstream annular space convert to von Karmaan Streets that do result in an increase in the downstream pressure which makes flow read low. We tested this at CEESI in the 1990's but never got permission from the lawyers to publish it. That test was a tiny part of a much bigger test and we didn't have the time to experiment to find out where the influence stopped. It likely that 2D downstream of the meter the elbow wouldn't have mattered, but we didn't test that.
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist