Eccentric orifice plates in vertical pipe
Eccentric orifice plates in vertical pipe
(OP)
Are there any concerns specific to installing an eccentric orifice plate in a vertical pipe?
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Eccentric orifice plates in vertical pipe
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RE: Eccentric orifice plates in vertical pipe
Good luck,
Latexman
RE: Eccentric orifice plates in vertical pipe
Since hold-up from orifice position in the vertical line is not a concern, the correct installed position is unclear. I was thinking that positioning the plate off-center with respect to the taps could cause some measurement error. Such as the taps on opposite sides of the pipe but with the eccentric orifice closer to one tap.
MF
RE: Eccentric orifice plates in vertical pipe
Good luck,
Latexman
RE: Eccentric orifice plates in vertical pipe
Good luck,
Latexman
RE: Eccentric orifice plates in vertical pipe
RE: Eccentric orifice plates in vertical pipe
Specific to your question I suspect the orifice plates are for measurement purposes (delta p over plates).
In any case I suspect under circumstances (if plates are too near each other) you could have more turbulence on both plates if excentric than if 'lined up' centric or excentric.
If this is the case you might have a tendency of varying and more unaccurate mesurement if measuring purpose, varying with the degree of turbulence. If choking perhaps (extra) varying degree of choking with flow or perhaps turbulence or cavitation problems and extra wear.
Certain is, however, that the flow picture/flowlines will vary with the distance (long distance less or no influence) and orientation of the orifice plates and flow.
To get a more accurate answer on influnce the only way is to test out 1:1 on actual site against a 'neutral' calibration. (If this is at all possible in practice???)
RE: Eccentric orifice plates in vertical pipe
In horizontal pipes, they would allow drainage if offset toward the invert.
In any pipe, if 2 or more eccentric orifices are in series and offset, then the effective restriction effect is increased, and solid particle erosion may be decreased on the downstream piping. As I recall, this configuration was used in the 1960's on supercritical power boilers in their startup systems, downstream of a block valve ( drain)..
RE: Eccentric orifice plates in vertical pipe
I don't think there are any general concerns to using an eccentric orifice in the vertical, but I can't think of any advantages either. Can you clue us as to why an eccentric is being used? Usually eccentric and segmental plates are used to address damming of seperated phases and/or solids in horizontal runs. If you are measuring in the vertical, then the flow direction is probably the most important detail- i.e. liquid upflow.
best wishes,
sshep