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PSA: Worn impeller vanes cost me a full shift of downtime last week | Dredge Operators - Hub Chatter

PSA: Worn impeller vanes cost me a full shift of downtime last week

I was running a 12-inch cutterhead on the Missouri River near Kansas City last Wednesday and noticed my production rate dropping by almost half. Checked everything from suction to discharge lines before I finally pulled the pump and saw the impeller vanes were worn down to about a quarter inch. That little detail cost me 8 hours of pulling and replacing parts that I could have avoided if I'd done a proper wear check before the job. Anyone else ever get burned by something that simple slipping your mind?

3 comments

3 Comments

dylan4134mo ago

Man, that's a good point about the wear ring but I think there's something else that gets overlooked all the time. Have you checked the actual efficiency curve on your pump lately? Like, the vanes might not look that bad to the eye but if the pump's running way off its best efficiency point, even a little wear screws your production way faster than running it in the sweet spot. I've seen guys slap on brand new impellers and still get crap performance because the pump was sized wrong for the job or the discharge head changed. The vane wear was just the canary in the coal mine, not the real problem.

sammurray4mo ago

Yeah, I'm not so sure you can pin this one on the impeller vanes alone. I've been running similar gear on the Mississippi for years and a quarter inch wear usually still keeps production up, unless there's other issues like a partially clogged suction screen or a slipped belt. Sounds more like you might have had a combination of problems, and the vanes were just the first thing you saw. I'd check your wear ring clearance too, that's often the real culprit when you see a sudden drop like that.

anna_hill2mo ago

Oh wow, I guess @sammurray is the lucky one with his "usually still keeps production up" magic impellers. Must be nice to live in a world where a quarter inch of vane left is somehow acceptable, because down here that's basically a paperweight. I'm starting to think you're all just running these things until they whistle and then acting surprised when they quit.