RO sizing in 1" warmup line centrifugal pump
RO sizing in 1" warmup line centrifugal pump
(OP)
Hi Folks!
I'm looking for guidelines/calculations for sizing RO's in 1" warmup lines.
We're speaking of centrifugal pumps, both horizontal and vertical.
Why?: when an operator opens the valve in the bypass line over the checkvalve too far, it causes a flow large enough to spin the impeller backwards, causing the mechanical seal to break.
I've seen this thread: thread407-133249: Flow to rotate impeller backwardly
Here JJPellin states he uses 1/4" for pumps under 200 bhp and 3/8" for pumps 200+ bhp. I'd like to know if there is a source that could confirm or explain this.
I hope I've given enough information
Jim,
I'm looking for guidelines/calculations for sizing RO's in 1" warmup lines.
We're speaking of centrifugal pumps, both horizontal and vertical.
Why?: when an operator opens the valve in the bypass line over the checkvalve too far, it causes a flow large enough to spin the impeller backwards, causing the mechanical seal to break.
I've seen this thread: thread407-133249: Flow to rotate impeller backwardly
Here JJPellin states he uses 1/4" for pumps under 200 bhp and 3/8" for pumps 200+ bhp. I'd like to know if there is a source that could confirm or explain this.
I hope I've given enough information
Jim,





RE: RO sizing in 1" warmup line centrifugal pump
See also attached article - it discusses some of the key points: http://turbolab.tamu.edu/proc/pumpproc/P5/P5109-11...
Dejan IVANOVIC
Process Engineer, MSChE
RE: RO sizing in 1" warmup line centrifugal pump
Because we will be creating a limitation to the warm up process I'd like to find the point where we can get the best warm up rates without breaking the N2 seal.
RE: RO sizing in 1" warmup line centrifugal pump
In absence of feedback from OEM (if the case), I'd go for what JJPellin recommended in the referenced thread - start with a 1/4" hole and see where does it get you. If insufficient, you can always increase the hole diameter.
Dejan IVANOVIC
Process Engineer, MSChE
RE: RO sizing in 1" warmup line centrifugal pump