We use roller bearings on ship's turbochargers that are as big as the pump in the photo. But they have their own lubricating system using old fashioned dino oil rather than the oil in the media that is being pumped. They run for weeks at a time at around 7000 rpm. We overhaul them every couple of years based on hours run, in a preventative maintenance program. Dave
Must be one hell of a big refrigeration plant or freezer or building to cool to require a pump that big, based on your location I think I know who you work for BRG Paul... :biggrin5:
^^^ York Pa.... Soooo.. I'm guessing its for this company.... Arctic York Peppermint Patty TV Commercial - YouTube
These particular vapor compressors will run for at least one solid year of continuous duty at a stretch and also have a required 80,000 hours minimum service life between overhauls. The bearing parameters are...110mm shaft size / 12,000 RPM / 41,000 newton (9000 Lb) dynamic load. There isn't a rolling element bearing out there that comes anywhere close...not even ceramic bearings. The shaft size required to support the gear load results in rolling element bearings that are simply too large to tolerate the speed. Rolling element bearings also have a noise signature that is unacceptable too. (We really don't like to be heard on sonar) Ball bearings are not well suited for MIL-S-901C Shock testing either. Hydrodynamic fluid film bearings handle the load and speed without noise or L10 life issues common to rolling element bearings. - Paul
Well.... No, but they are a customer. And so is Jack Daniels, Coors, Anheuser Busch,... (My favorite food groups.). We do process cooling as well as comfort cooling for a wide variety of applications... 135 year old company......South Central PA.
If you have ever been to any the Graeter's ice cream shops..... Well.... You've touched me... I make the custom door pulls for their entrance doors..... These will be shipping out today to one of their new locations.....
Here is the Graeter's ice cream shop in the town where I live... It was the first location that starting sporting my handles.... The front entrance has a double door.... It's hard to see but they are on there... Oh.... And they make great ice cream....:drool
I'm sporting handles from ice cream shops as wel... oh. You mean you MADE the handles. In my case, the ice cream made the (love) handles. :blush2:
Bearings modified.... Dynamometer testing complete. The first of 4 shipped finally today. You can thank your government for the "Hulk" green primer.
I opened up the journal bearing clearance by .004" on the diameter for the pinion and gear bearings. Shortened one pinion bearing to achieve L/D of 0.8. Added a hydrodynamic pocket to the unloaded section of each of the two low speed journal bearings ... Added a second drain port to the low speed forward thrust bearing. And increased the size of the primary scavenge ports of both the high speed and low speed thrust bearings... It took a bit work ... and I'm glad it is behind me now. Whew!