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fault housing and bearing
Registered Member Can you post vibration spectrum? Thanks [ more ]
Registered Member Hi Husky, Just to share some knowledge abt tool that u use, SKF CMAS100. Default setting for Enveloping (CL2) reading is for shaft diameter OD 50-300mm & machine speed 500-1800rpm. In that your case is machine speed of 3600rpm, this vibr pen is not suitable. As for my experience, I am not using vibr pen for Enveloping measurement because it will not give either precise nor accurate reading. For vibration (velocity mm/s) is ok. Try ADASH vibr pen for more enhanced features. [ more ]
Registered Member I know what the tool is and that gE level would be high enough to warrant an inspection, were you able to grease the bearing mid reading? Ideally that tool is ok for assisting in greasing and less critical plant assessment, I wouldn't use it for high criticality machines your better off with a SKF Microlog in that case. [ more ]
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Perfect PM Compliance
Registered Member 😂
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Registered Member I think the more important thing to note is that this is a Fire Riser valve, and as such should be definitely PM'ed for real, and correctly at all times. This belies an attitude of disregard not only for routine maintenance, but for the condition of safety-related systems. I would not care to work in that environment other than to be given the opportunity to make it safe and reliable. [ more ]
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Bearing failure at 36,000 RPM
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Registered Member Wow, this is a disastrous amount of damage. What was the cause of bearing failure? If you don't mind what is the rotating mass, and what is the power for the unit? [ more ]
Registered Member Turbomolecular pumps are used mostly in scientific and semiconductor processes for high-vacuum creation. They are usually supported by mag-lev bearings and any failures, i.e. particulate ingestion, loss of power to the bearings, etc are usually quite catastrophic. Using mag-lev bearings makes vibration monitoring a non-productive task. Visual inspections will reveal very little, and because of the nature of trying to get a system back to high-vacuum once exposed to water vapor in the... [ more ]
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Bad Bearing- Well Balanced Fan
Registered Member I have added low vibration alarms to certain fan measurements for this exact reason. I have a number of overhung fans on dust collectors that tend to skid since I think they are loaded with "upseedasium"! Got caught by an inboard bearing that catastrophically disassembled and went very smooth. The bearings are in a dog house guard and could not be visually inspected. Won't be fooled again with the low side alarms in place. See illustration] [ more ]
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Registered Member Perfect example for why vibration analysis alone will not catch every bearing failure!!! Sometimes you need eyeballs! [ more ]
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Xtrem Bearing Damage
Registered Member Nobody ask this so i will, HOW LONG THE BEARING RAN AND HOW LONG SYMPTOMS WERE OBSERVED BEFORE IT FINALLY FAILED? OR DID YOU STOPPED IT? [ more ]
Registered Member dear rttech... What do you mean by "loss of interference fit" How can an established interference fit get "lost"? I think unless we have an image of shaft at it's bearing area, we can not conclude on the reason of failure. [ more ]
Registered Member interesting that you are using fan to keep it cools. how long did you managed to keep it that way?feel free to share with us last data of the bearing. =) [ more ]
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Paddle Fan Failure due to Resonance
Registered Member Rusty, I am curious whether or not there was any indication of a resonance, obviously taking place in the impellor, in the vibration data assuming that the seismic readings were taken on the bearings? How do you know that namely Blades Pass Requency had excited the resonance of the blades? In my opinion, the ringing/flexing of the impellor structure was transmitted to the bearings. Some "weired" frequency should have been seen. Of course no bump test made sense to do after the failure. [ more ]
Registered Member If welding is the problem, is it possible to check on the WPS, PQR and WQT records? [ more ]
Registered Member It's a good case, thanks for sharing. Since this question of how blade pass frequency affects the rotor was brought up in another thread… http://maintenanceforums.com/e...20203373#63620203373 it makes for interesting discussion and I'll throw in my two cents fwiw here. I agree with Bill, it's not obvious that the blades will see blade pass frequency forces unless we're talking about torsional resonance involving all blades moving together (so that a force pulse on any blade contributes to... [ more ]
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Archives
Registered Member COOL !!! [ more ]
Registered Member I have one somewhere...distinctly remember packing it up when I retired. Only used it while with Philly Gear as I did find it useful for single plane work. [ more ]
Registered Member We had them made while I worked for Nicolet. We wanted something novel to give out at trade shows (remember them?). Everybody made the vibration version. We just thought it was novel. [ more ]
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Gear oil failures in windmills
Registered Member Yeah they try to find new oil instead of doing complete RCA. I am sure all thier engineering is sound on paper, But if reality does not match expectations of engineering it means back to the drawing board. I would think Their brake system should be providing the static load bearing force when stopped or rotational speed gets slow to point of bearing failure. I know armchair quarterback rite? Well engineering only realizes and legitimizes facts and variables known and/or previously... [ more ]
Registered Member One has to consider the definition of "lifetime." Major overhauls are currently being needed every 3-4 years, so how do we define the word. John from PA [ more ]
Registered Member I remember when BMW tried calling their motorcycle final drive gear oil a lifetime fluid. They committed themselves and removed the drain plug from the rear end casting. Final drives were failing very often as a result. Toyota called out that their transmission fluid should be considered "lifetime fluid" unless used under severe conditions. But they gave the usual drain plugs and dipstick "accessories". I wish them the best of luck in developing a lifetime oil for a severe duty bearing. [ more ]
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Noisemakr's Infrared Images
Registered Member New images added today, 3-25-2011. Images are of a fused disconnect feeding a capacitor on a transmission line feeding our plant. Although the temperature is not high, the difference in like components is significant. It would appear the “fuse/disconnect clip is either loose or corroded. [ more ]
Registered Member New images today. 10-5-09 Boiler external wall audit. These are some good examples of insulation failure in our boiler walls. [ more ]
Registered Member New images added today 7-27-09. The new images are of a 400 HP Open Drip Proof motor. As many as 12 restart attempts were made in less than an hour not confirming one phase conductor was shorted inside the motor's junction box. The motor lead was found to be melted apart. Root cause was chafing of the insulator and subsequant short to ground. This image was taken after all termininations were redone. As can be seen, one motor lead shows significant heating. Add to the heating issue, a 40 AMP... [ more ]
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Predictive Maintenance Hall of Fame
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Registered Member What do you think the Starrett Model 192 is worth as an antique? I had one show up at our plant that our machinest found in the back of a cabinet. It was a GE model. Probably will be a show piece for plant engineering. [ more ]
Registered Member I have one of these that belonged to my dad. I do not have the instructions for it though. Could you copy them and send them to me? moneal5396@d-m-motortech.com It sets on my desk as a reminder of how far we have come in this field. [ more ]
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