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OLi

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Reply with quote  #16 
No, maybe best described as in the other plane.
Pipe comes in thru wall, goes in trench until it divides 90 deg up, short pipe, enter pump.
But the pump is not 90 deg towards the incoming pipe, it is turned on the flange and is for
some stupid reason mounted in like 75 deg in the horiz plane relative pipe so flow hit a 90 deg up
and a pump inlet with some kind of splitter but is entering in a not straight on but uneven split fashion.
I never heard of that funny complication before. I wonder if it can be adjusted? Or if you need to move the pump.
 

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electricpete

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Reply with quote  #17 
Just trying to nail down the orientations
Quote:
Pipe comes in thru wall, goes in trench until it divides 90 deg up, short pipe, enter pump

the up section is pure vertical?  The enter pump section is pure horizontal?

If yes to both above I can see two different remaning ways to visualize it:
1 - Entire pump is rotated with respect to horizontal, as if you has 6 pipe flange bolt holes and were one off (90/6~16 degrees round numbers)
2 - Entire pump is rotated so when looking from the top, the inlet horizontal pipe is not exactly perpendicular to the shaft (which requires something unusual at the inlet flange)

Either way it sure sounds unusual.  I'm not the guy to say, but sounds like maybe a smoking gun for the noise/vib along the lines of what Rusty was saying.  

Aside from that, I'd think unbalanced suction conditions would affect the pump thrust.  It might be interesting to check pump thrust bearing temperature indication(if applicable) or bearing housing temperatures.
OLi

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Reply with quote  #18 

Nope this looks different to any normal, it enters pump from the underside, pipe going in is vertical.
I tried to describe the description 1 I think.
Yes I never seen a thing like that.
True, if they dare to run some longer time I will try to get temp data.
Yes I hope it is the smoking gun, it does add up quite nice. Datasheet say 2-wheel design give optimal load balancing.
Not being so happy with flow induced problems either it is funny that the OEM specialist, his competitor and the
consultant company we work for and their grand old pump specialist that called neither made any comment on this feature.
So Rusty beat them all :-) good work!


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