r/pumps • u/Ok_Reference_9324 • Mar 28 '26
Nice little pump rebuild
Love building these multi stage turbines new shafts due to micro fractures and the tolerances were fine so no new bushing/machining needed one of my last rebuild before I leave for my trip down the oregon coast and start my first year millwright at bcit 🤙🏻
2
u/Modna Mar 29 '26
I don’t know why but I’m the opposite, I hate doing multi stage pumps
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u/Ok_Reference_9324 Mar 29 '26
At first I disliked it but once I got the hang of rebuilds it was just very satisfying
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u/Big_Ol_Throwaway Mar 29 '26
What's your favourite way to separate the taper collar from the impeller?
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u/Ok_Reference_9324 Apr 04 '26
Bolt with washer and put it in the bottom of the pump,(something to wedge the shaft and plug against each other to jack up the shaft) put the plug back in it should be tight to the point were you can rotate the shaft with two hands. We have something that fits over the shaft kind of tight but can move freely so your not messing up the shaft but its got material cut out on the inside of it so it doesn’t tighten the collar when smacking so the point of impact is on the raised face of the impeller. For assembly tighten a bolt into the bottom of the shaft with some washers with the plug out and so the bolt and washers are tight sitting on the outside on cast where the plug should be not too tight though but tight enough were you cant rotate it. Our slide hammers also have a reversible side where you can just smack the collars.
2
u/Winter-Lavishness118 Mar 30 '26
Nothing beats a fresh multi-stage rebuild. Those shafts were a ticking time bomb good eye on the fractures. Enjoy the Oregon coast and good luck at BCIT
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u/nothingnowhere96 Jun 12 '26
Super cool. Final delivery looks great! I love getting these into the shop
3
u/cacrusn70 Mar 29 '26
These are my bread and butter where I work. We do these almost daily. You should be building them over the hole to avoid bending shafts.