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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Lubrication Excellence Conference
Registered Member Wish I could be there. I'm just down the road a piece near Houston. Two folks from my plant with be there... Rob J. and Jimmie R. Say "hi" to 'em for me and tell 'em I said to quit goofing off and get back to work ;-) [ more ]
Registered Member I intend to be there, unless the plant goes hard down on me. Will be in Mitchells class on Monday. Ken Culverson [ more ]
Registered Member I'll be there, and presenting a paper on online oil diagnostics for intelligent filtration. Perhaps we can meet up there and talk (maybe there should be a reliabilityweb posting board member meeting at the hotel bar when the exhibits close!) Rich Wurzbach rwurzbach@mrgcorp.com [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Fluting failure on electric motors bearings
Registered Member Do a Google search on electrical fluting...there is loads of info on the subject. Also, I found two articles particularly useful. The first is a product technical paper, but has some good explanation of the issue and possible solutions. The other is simply a diagnostic help. http://www.reliance.com/prodserv/standriv/d7723/ http://www.skfcm.com/service/support2/New%20Library/CM3090%20Electrical%20Fluting.pdf Good luck. Mark [ more ]
Registered Member Estimado Jesús, in general, please be careful to take the advertising about special bearings without a full understanding of the subject. The bearings can be for instance insulated with a thin layer of nonconductive material. It is still a capacitor and conducts high frequencies well. There are several steps to undertake before you must also take the relatively high cost of special bearings and they rarely help alone. Read Thomas´ texts and if you need more, just drop a line. ... [ more ]
Guest I have one or two articles about this subject Mr.Cornelio may contact me.My e-mail address<thomas_purackal@pic.com.kw> [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Lubrication Question
Registered Member Hello All, Just a minor point (for clarification) I am not implying that lip seals are air tight. Their ability to hold pressure in an application is a function of the ~6-12 % seal swell from the absorbtion of oil and the physical interface between the rubber lip the oil and the housing/shaft surface. In a new installation the seals will (leak like a basket) so to speak until they get seated.... Sorry for the confusion.... regards..... [ more ]
Registered Member Thanks all for clarifying to me about different types of seals. I did not realize before that some oil seals are air tight. [ more ]
Registered Member Hello All, Debal the purpose of the breather (as others have stated) is to allow for the equalization of pressures between the outside and inside of the unit. Yes you are right the seals will allow the pressure to equalise but on the way out they will take lubricant out and on the way back in they will bring contaminants. So the breather is also supposed to filter out the contaminents. What contaminents you want to filter out will dictate the type of breather you select. There was some... [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
oil cross referencing
Registered Member I don't know of a web site, but Noria will usually answer these types of questions.. and Mobil and Chevron both have 800 numbers where you can call and talk to a real engineer about compatibility. Their main purpose is to tell you what Chevron Product can replace a what Mobil product or vice versa, but they also answer questions about compatability and interchangability. In general, almost all oils are "interchangable" i.e. can be drained, then another added. The small amount of oil film... [ more ]
Registered Member Thanks e-pete, I was actually talking about interchangeability. Guess I had one of those "brain hic-cup" moments. [ more ]
Registered Member Just to clarify terminology, I usually associate the term "compatibility" with whether or not two lubricants can be comingled. We talk a lot about grease compatibility. I usually associate the term "interchangeability" with whether or not I can drain the oil and substitute one oil for another. Do you mean compatible or interchangeable? [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Metal in the Trico Buld?
Registered Member Back on the subject of whether simple diffusion is all that is required or something more... I am remembering now there are several types of Trico oiler. The one I am most familiar with has a simple slant-cut tube on bottom of the bulb which goes approx to the midpoint of a horizontal pipe from the reservoir. The simple principle is when oil in the pipe drops below the top of the slant it allows air to bubble into oiler and some more oil displaced into reservoir. When level rises there... [ more ]
Registered Member If you feel that there is no potential for differential levels to account for cross-flow, convection currents is another possibility. The oil in the reservoir will heat up more than the oil in the oiler ball cup. The warmer oil will tend to expand and displace into the ball cup, and if there is sufficient volume in the connection pipe, create some circulation. I would recommend analyzing the material in the oil. Knowing whether it is wear, contamination, or oxidation byproducts will be very... [ more ]
Registered Member All of the air movement problems I have found discuss unequal pressure between the case and oiler, which cause misfeeding by changing the oil levels between the two. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Correct oil for sleeve bearing machines
Registered Member It sounds like you have good advice. We use R&O for these type applications. I believe the reason is because it is cheaper and we don't need AW. One thing to beware if you use certain AW/EP additives it can create problems in presence of zinc (such as in brass slinger rings). I'm a little fuzzy on the details right now... maybe someone can refresh my memory on that problem. [ more ]
Registered Member Ed's explanation in very good. The only exception would be if the oil was dual use with some hydraulic function, such as a hydraulic servo valve control. Since your feedpump is motor driven, perhaps there is no such control in the system. I have seen some reservoirs where they also feed a hydraulic system that requires an AW additive for proper operation and wear of the hydraulic components. Otherwise, R&O is the way to go. Rich Wurzbach Maintenance Reliability Group www.mrgcorp.com [ more ]
Registered Member Ed, Thanks for the reply. That confirms my thoughts. I also checked with my local LE rep. who concurs with your info. Muchas Gracias [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Greasing shielded bearings ????
Registered Member Lee, In answer to your question about sealed and shielded bearings. Sealed bearings typically have rubber seals on each side. These seals make rubbing contact with the inner race, there is no gap. Everyone agrees that these can't be relubricated. They are normally only specified for harsh environments because the rubbing contact of the seals actually shortens bearing life, so they will not last as long as a shielded or open bearing in a good environment. Shielded bearings have metal or hard... [ more ]
Registered Member David We have three deep well effluent pumps in which we replaced the upper plain bearing for a flanged SKF bearing. The bearing is 2RS however the housing has a grease nipple fitted to which we fit a 6mm tube with a nipple at the assembly top plate. The path of the grease is into the bearing and out through the rubber seals. I understand how greasing outside of 2RS bearings would not allow grease into the bearing. In our case the force of the grease slightly distorts the seal but we know... [ more ]
Registered Member Some info you may already be aware of: - AFBMA number is provided on the nameplate of motors. - AFBMA Suffix PP stands for double shielded (i.e. 65BC03 JPP3) and suffix EE stands for double-sealed (i.e. 65BC03 JEE3) - Manufacturer p/n's often identify seal or shield. For SKF it is ZZ for double-shielded and 2RS1 for double sealed. All of the shields I have seen are metal. Seals by their nature require a rubbing contact so they will usually be at least partially rubber. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Lubrication Consolidation
Registered Member When we did it our lubricant supplier (Mobil) provided free detailed consultation. I assume this is available to everyone although maybe it depends on the volume of business you do with the supplier. [ more ]
Registered Member I did a number of third-party consolidations, and wrote a paper on the topic. The key to success is the development of generic specifications for plant lubrication requirements which both minimizes the number of different products, and allows the company to leverage multiple plant needs in obtaining competitive bids from suppliers. This paper is available at http://www.mrgcorp.com/white_papers.asp?aID=1033 Hope this is helpful. Contact me if you have any questions. Rich Wurzbach Maintenance... [ more ]
Registered Member When I still worked for a large company a decision was made to go to 5 oils. 1) Hydraulic 2) spindle 3) Waylube 4) lighter gear 5) heavy gear The biggest problem was machine warrenty. Some OEM wanted specific manufacture and some wanted a specific grade. The process worked well overall. The reason for the change was oil cleanliness, we set up five bulk oil recieving tanks and filtered the oil leaving the tanks going into our oiler carts. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Old Grease
Registered Member By design, the best situation is to have a purge plug opposite the grease fitting (zirk). When regreasing at regular intervals, remove the purge plug and re-grease while the bearing is rotating. Continue greasing until fresh grease is seen emerging from the purge hole. Leave the purge plug out while running the bearing for 10 minutes or until the bearing reaches its normal speed and operating temperature. The bearing will purge any excess grease to prevent undue pressure on any sealing... [ more ]
Registered Member If the bearing housing is well designed, it must have a grease niple and an oulet, I think it is called a "down commer" (excuse me if I am wrong) so the old grease is displaced. [ more ]
Registered Member What we notice is the base oil becomes involved with various chemical reactions causing the NLGI rating to thicken until such a time where as the bearing is running on the thickener soap with very little base oil and failure will soon follow, relubing prevents this from occurring. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Lacquer formation
Registered Member Hi Cid, Oil degradation in this form is usually related to an over exposure to heat. Check your oil analysis ICP results and if Si is elevated this could be why the lubricant is cracking and depositing around the engine as this could indicate fine hard contamination accessing the induction system and cracking the lubricant as the hard particle remove metal. there are lots of other reasons but you should pick those from the normal oil testing eg Coolant loss will cause the lubricant to break down [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Correct Amount of Lubrication
Registered Member Thanks - I Will do so Terry O [ more ]
Registered Member Terrence, please refer Mike to the post on 8'bearing lubrication dated 21 September 2004. The SKF formula for quantity of grease on initial lubrication and re-lubrication are there. However here is the formula (bearing O.D. X bearing width X .114) this will give you the quantity of grease in ounces on initial lubrication. Dependant upon the service of the motor, that will determine the quantity (25-30%)on re-lubrication and frequency. This information can be found on the SKF websight also. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
8' Bearing Lubrication Procedure
Registered Member Hello, I just joined the sight and saw this post. In answer to your question of how much grease is required of an 8 ft. dia. bearing that is 4inches wide , use the SKF formula bearing O.D.(in inches) times the bearing width times .114 (O.D. X W X .114) this will give you the quantity of grease in ounces by wt. required for initial lubrication. based upon the speed quoted for this bearing I would think that re-lubrication should only require about 25% of that amount based upon SKF... [ more ]
Registered Member With this type of application is will be important to monitor the used grease to see what is occuring in the bearing. We don't think VA will offer good info @ this slow RPM. To start pre pack as per the bearing makers instructions, this should work well and we don't want to void any "warrentees". When the bearing is being installed it is very important to ensure there is a grease relief path so as the lubricant is applied there is an easy path for the used grease to escape and this path must... [ more ]
Registered Member This is a slow moving large diameter rolling ball bearing. What is unknown is the characteristics of the OD and ID mount. Each ball is rolling 3 times a second or traveling 3 feet per second. This seems to be a low rate and so not much heat is being built up in the races. Grease is a oil lubricant mixed with a soap to fix it in location. Thus putting grease above the seal ID line would result in seepage. How often due you grease the bearing? Do you use and ultrasonic grease gun to determine... [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
High Mileage Vehicles
Registered Member I have used high quality synthetic oils with 20,000 mile drain intervals. The engine now has over 260,000 miles and only been opened once to replace head gaskets that were leaking oil on the block. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Zinc free Hyrdraulic Oil
Registered Member dear ledforph let me know what,s the color of jelly substance and what is the oem recomendation for lubricant and what is the operating temp. [ more ]
Registered Member Hi Ledforph We have used a similiar zinc free hydraulic oil with ashless additves in screw compressors and faced similiar problems .We had taken a lot of samples and on analysis we found that the organic and inorganic acidity were present in most cases . This is due to the additves that are being used (phosphate esters) which normaly gets converted to phosphoric acid which reacts with the oil and causes jell like formation. Please check with your oil supplier for the same. [ more ]
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