MKultistage Orifice Assembly
MKultistage Orifice Assembly
(OP)
Hi all,
Currently reviewing a design of a multistage orifice assembly before we manufacture it.
We have always used a typical configuration which looks a little something like this.
concentric plate / eccentric plates with differing bore locations down the line / concentric plate.
The reason we have always done this is to prevent a jet from skipping a stage.
We are now about to manufature a three plate assembly which looks like this:
eccentric/concentric/eccentric
I myself see no problem with this configuration but some of my collegues are showing concern simply because this is not the way we have done it before.
I'm just after any thoughts or input that might be of use to me. Are there any implications with this design? etc.
Currently reviewing a design of a multistage orifice assembly before we manufacture it.
We have always used a typical configuration which looks a little something like this.
concentric plate / eccentric plates with differing bore locations down the line / concentric plate.
The reason we have always done this is to prevent a jet from skipping a stage.
We are now about to manufature a three plate assembly which looks like this:
eccentric/concentric/eccentric
I myself see no problem with this configuration but some of my collegues are showing concern simply because this is not the way we have done it before.
I'm just after any thoughts or input that might be of use to me. Are there any implications with this design? etc.





RE: MKultistage Orifice Assembly
Good luck,
Latexman
RE: MKultistage Orifice Assembly
RE: MKultistage Orifice Assembly
1 pipe ID does not allow for much recovery. Are you maintaining the different bore locations down the line? If you are, I think it should work as good as the previous configuration. If you are not, I'd do some testing.
Good luck,
Latexman
RE: MKultistage Orifice Assembly
RE: MKultistage Orifice Assembly
I'm with you on your last post. The purpose of using multistage restrictions is that of getting considerable pressure drop without inducing cavitation or flashing phenomena. If each element is properly sized, why look for pressure recovery between plates?
Is your multistage orifice to be used with single-phase fluid?
RE: MKultistage Orifice Assembly
In the limit of that thinking, why not use zero separation, i.e. a 3X thick orice plate?
I would think if the vena contracta does not have time/separation to contract and expand, contract and expand, and contract and expand there will be less pressure drop, thus it'll be less efficient and more plates may be needed compared to more separation. This is probably like zdarlight explained as a jet skipping a stage (or not having to go through as torturous a path).
Does anyone know of some research on this?
Good luck,
Latexman
RE: MKultistage Orifice Assembly
Sorry Latexman, what do you mean by a 3X thick orifice plate?
RE: MKultistage Orifice Assembly
Not!
Good luck,
Latexman
RE: MKultistage Orifice Assembly
Latexman, with a 3x thick plate the fluid would anyway experience a pressure recovery, since the permanent pressure drop attainable is always lower than the peak pressure drop at the vena contracta, as the fluid expands thus reducing its velocity and increasing its pressure.