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HP Pump Piping Outlet

HP Pump Piping Outlet

HP Pump Piping Outlet

(OP)
Hello Gents,

We are replacing a water injection spool directly from HP pump outlet. (Fluid:Water, Flow: 700 M^3/H, Diff Head:737M Outlet size 8")
When we have removed the Existing 1500# Rated spool (LTCS Astm A333-6 SMLS) we have found that the RF Flange that mates to the outlet of the pump (RF) has had its bore 'opened out', and hence its face width reduced slightly. It is not been a tapered bore that you would expect, maybe to allow for any bore missalingment but an actual machined preparation (The only thing that can help me explain it is like an internal 'J' type weld prep)
My thinking is that this opening out of the internal bore would be causing eddys,cavitation etc. and therefore erosion of the pipework.(Which we are now witnessing) My question to the forum is, Why would such an internal machining be employed, surely when mating to an HP pump outlet, it is preferable to use an identical flange with identical (as near as damn it) bore to facillitate a good flow of fluid. If this was a one-off I wouldnt be too concerned, but when we removed another spool, the internal of the mating flange had also been machined that way. (There is no note of why on the PID or Fabrication iso) My concern is that we will replace this spool with a standard RFWN but may be missing out on some fundamental benefits of the original design.

RE: HP Pump Piping Outlet

Cosas vederes, Sancho que non crederes... (Don Quixote: Things you'll see, Sancho that you would not believe).
Just a couple of comments, also speculating...
May be I am totally off... but cannot think of any reason why you'd do that... in any case that is such a small change to an 8in pipe that would achieve nothing except the erosion you reported.
Would it be difficult to consult with the people that installed the equipment? Pump manufacturer? may be they have records regarding this...
In any case...since it is a material removal... have you thought about building the spool in a regular fashion (i.e. no extra machining) install it...see how it works and if no difference is noticed... forget about it, otherwise remove the spools and do the machining (also called: error and trial - I use the expression reversed because if there is no error the 1st time it becomes the definitive solution... otherwise you try again

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