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Multistage RO
2

Multistage RO

Multistage RO

(OP)
Hi all,

I'm Nazri
I've 1 question on RO (restriction orifice).

When we need to use multiple (2 or more) RO instead of single RO? Which 1 is prefered?

What is the basis on this?

Thanks.

RE: Multistage RO

I have only used plates associated with a control valve in a similar arrangement as a multistage restriction orifice.  For high gas pressure drop consider a choke.

RE: Multistage RO

Multiple orifices are used to avoid cavitation.

I2I

RE: Multistage RO

Multiple orifices are sometimes used to satisfy API requirements that limit orifices to be no smaller than 1/8".  This is an attempt to avoid plugging.   

Johnny Pellin

RE: Multistage RO

I have seen some RO's with multiple orifices (instead of a single orifice) distributed across the plate, this for high pressure drop. In some other cases we have sized pressure reducing apexes to be fitted in a spool, when the pressure drop required is so high for a single RO that would otherwise cause cavitation. Also remember noise and vibration is always a problem, normally in my experience for pressure drops greater than 3 bar across a single orifice plate, we would normally go for pressure reducng apexes.

Regards.

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