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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Diagnostics from particle content in oil analysis
Registered Member hi, its sound like you would like to see a machine condition through oil analysis perspective.Probably you would like to go for Filtergram analysis or Ferrorgram analysis combine with RFS. For a more detail SEM with EDAX could explain better. of course you could predict future failure by using this method. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Oil leak in piping -> contaminants ingress?
Registered Member One way for outside air with contaminants to ingress into the system is when pump is off, as other mentioned. Another one may take place in cases when venturi effect occur, .... it can not be ruled out. [ more ]
Registered Member Particulates 10-25 microns is what kills most hydraulic systems-this is where you get the 3 body abrasion or the sand paper effect as the fluid makes its way through the valves/motors etc. These are smaller than can be seen with the human eye and are unavoidable as far as intoducing them into the system each and every time a system is opened. Ticker [ more ]
Registered Member it is common understanding that if we see oil leak whether it is for lubrication or hydraulic application, we need to stop the leak. Operator daily rounding within machinery vicinity is common and presence of oil leak is one of the parameter they are looking at. i have not come accross any plant that tolerates with oil leak i.e if oil leak is there on the piping, it will be priority job for mtce. i dont see people keeping the same acknowledged oil leak issue as an issue in the next run when... [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Polyrex EM vs Mobilith SHC100 for electric motors
Registered Member That is interesting info on the SHC100 and the fan pillow blocks. We are using this grease in our fans and have had good luck with it to date. [ more ]
Registered Member Pete...Yes I am saying SHC100 did better in "some" applications than polyurea (more so with shear stable) Yes I am saying EP additives cause problems in lightly loaded bearings like double row sphericals on a fan No...I didn't mean to indicate polyrex had EP additives and SHC100 didn't...in fact SHC100 does some EP additives. However the synthetic fluids in this grease have proven to counter act the effects of EP additives. The same results can not be expected with a standard lithium complex... [ more ]
Registered Member Thanks all. That is good info... I’m still digesting. One question for P ZRT... I can’t quite make sense of this: Are you saying the pillow block bearings had problems with Polyrex and did better with SHC100? Are you saying EP additives caused problems for this particular application? Are you saying the Polyrex had the EP additives that cause the problem and Mobilth SHC100 didn’t? (I associate EP additives with Mobilith SHC100, not Polyrex EM). [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
AMSOIL 20/50
Registered Member I have used Amsoil 20/50 in my BMW R1150RT and R1200RT for about 120K miles. They are air cooled and can get hot when stuck in stop-and-go traffic. [ more ]
Registered Member I don't know about that particular viscosity, but I've ran Amsoil oil in my 2002 Ford Explorer since it had a little over 40k miles. I now have 240,000 miles on it with original tranny and engine. I run my engine oil for 15,000 to 20,000 miles. I change tranny oil at 60k. Differential and rear end on time in the book. I like the brands products. D [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
condeming limits for oil
Registered Member Mohammad, It depends on the type and amount of contamination in the oil and/or oil system components.What exactly do you mean by "off line cleaning"? Remove varnish, particulate, water? Need to better understand the situation before advising a solution. Thanks, [ more ]
Registered Member Eric, Thanks for the response. How long it takes for off line cleaning for approx 12000 liters capacity oil sump. Our critical compressors can't be kept down for more than 3-5 days during the annual shutdown, since they are for Gas lift operation for the Crude Oil production. Every downtime scheduled or unscheduled is associated with oil production deferment. I think 5 days are too low for accomplishing this task. Therefore we are considering possibility of On-line cleaning of the sump. Any... [ more ]
Registered Member Mohammad, Please let me clarify. Yes to system decontamination and Fluid Purification. Our high velocity oil flush pump skid creates turbulent flow throughout the lube oil system, therefore we design, fab and install jumpers around all bearings and valves so the contaminants that break loose during the flush do not go through tight tolerance, sensitive components. This is definitely done off line, during an outage. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Oil Change Intervals
Registered Member Charlie, For Gearboxes, EP additive depletion is the one of the most important one, due to heavy load application. Regarding Fluid drives i.e Voith couplings the most important parameter is the Load Stage test FZG reading for the Oil replacement e.g for Vorecon type, FZG is recommended to be above 9. For sleeve bearings, air release, demulsification, TAN, viscosity, and flash point are the important parameters. Regards Mohammad [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Filter Change Interval
Registered Member Agree with Vib Master. I would not go beyond a year for a filter change even if the differential pressure is below 2PSI. A perforated filter can run forever without much DP. If there is moisture in the system above 400PPm I would change the filter at least every 6 months. If moisture is higher than 1000PPm, I would change the filter monthly. [ more ]
Registered Member Better change filter based on diff pressure across the filter. You may also provide alarm for the same. Vibmaster [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Lubrication on Vertical Motors
Registered Member I normally spec yearly regreasing of electric motors. The usual exception is a more frequent cycle listed by the OEM or component manufacturer. I have use a hand vacuum pump to clear old grease from a narrow drain. It works quite well, just make sure to use enough tubing or an expansion chamber so you do not aspirate grease into the vacuum pump. [ more ]
Registered Member EP, I too have never seen grease come out of a piece of pipe or round 3/8" hole used as a drain in a bearing cavity. I teach to use a wooden dowel to reach up inside and ensure there is no hardened grease blocking the hole, but I've never seen any come out anyhow. Now with some of the Reliance motors (and maybe other manufacutrers I just haven't seen) there is a rectangular channel about 2" wide by 1/2" deep that runs down from the bearing and has a gasketed plate over the end of the... [ more ]
Registered Member They are opposite, but both on top side of the bearing correct? One on top and one on top would be "flow-through" design which is not compatible with shields. As stated above (and more below), I am skeptical of relying on grease flowing anywhere other than in a lump based on our experience anyway. I'm not sure if Coutte action was the correct term, but I was referring to pumping action which occurs when there is a thin annulus formed by 2 cylinders with relative motion/rotation between the 2... [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Oil Analysis: "In the House" Vs. Lab
Registered Member Thank you guys for all your comments, they are much appreciated. I'm new at this and was thinking of starting an oil analysis program to complement data from vibration and IR surveys. I think i will go for the third party option since I don't have a great volume of samples to analyze at this time. [ more ]
Registered Member Mech Pawn, Our plant has an in-house lab which tests for basic oil properties such as moisture, TAN, viscosity, BDV, and particle count. For further analysis on oil properties (RULER, ferrography, VSPI and DGA) we do send it outside. One of the main reasons why we have in-house labs is to have the advantage of getting the general condition of your oil at your fingertips and not at the mercy of the external labs. [ more ]
Registered Member mechanical pawn Well, Seems like I have missed allot since my last visits ... Lots of head buttin as usual However, the reason I come here is to learn and teach whenever possible, even if in the most rudimentary sense of the word teach... We have moved all bulk lubrications to a "vendor managed" service. In doing so, the "vendor's mix" lubricant is tested free of charge including the expendables, well I’m sure rolled into the cost of new lubricants modestly as it should be. Lubricants not... [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Best practices for installing oil sampling ports
Registered Member We at our plant want to install proper sampling valves on the lube oil circulation system for our turbomachines (GT driven Centrif Comp)with common lube oil reservoir. Can any one suggest what are the right sample valves available in the industry ? What are the problems faced to install them on a running machine? Regards Mohammad [ more ]
Registered Member Mike, I have various bits of info I could send through to you on sampling ports.(email me at admin@lubemate.com.au) I currently supply and use the Trico sampling ports (formerly Schematic Approach)with great success. Another useful resource is noria.com, try putting oil sampling or something similar into their search engine and it will give you more than enough to wet your appetite. Hope this helps. [ more ]
Registered Member Mike, We use the Check Fluid Sample Ports too. The L Series works good for us. Some with extender tubes. JB [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
OLTC High Moisture Problem
Registered Member Vacuum dehydrator will certainly get you there, but seems like overkill to me in terms of $, maintenance, complexity (potential failures). If it were our plant, I would be trying the dry gas purge idea because #1 it guarantees you are excluding moisture getting in thru a breather and #2 it might just work to remove water from other sources. As I said before we were not targetting levels as low as you in hydroscopic EH fluid, but it just might work with transformer oil. For initial trial to... [ more ]
Registered Member Updates from Pall on this issue. It seems that the supplied us with a filter element that's only able to absorb free water and not dissolved water. From the saturation curve of the oil, it's impossible for this element to achieve dissolved water values of less than 40ppm. Pall is suggesting vacuum dehydration as a replacement. Any insights on the effectiveness of this product? [ more ]
Registered Member Well according to ISO60422, our target moisture content is <15ppm. Anyway, we have contacted Pall, and there's a need to check on the filter element used. According to them we might be using wrong filters. Free water instead of dissolved water. Apart from that, CJC filters is also offering a solution that guarantees <15ppm of water. From their history on ABB TCs, they were able to achieve 10ppm. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Shelf Life Vs Service Life of Lubricants
Registered Member The lube may be installed up to its shelf life date then it may require discard if circumstances are wrong for extending service life. Containers of lube do tend to draw in moisture after opened. [ more ]
Registered Member I thought grease manufacturers specify shelf-life for grease in storage only which mean the oil may separate from thickener without any major movement while on the shelf in the store. Once there is movement eg in bearings, the oil won't be easily separated from the thickener. [ more ]
Registered Member I recall the reason for the shelf-life of grease is primarily a concern for separation of oil from the thickener. It seems like stirring prior to use might be an option, although that could be a recipe for possible contamination. It brings up a lot of other questions: what about grease in machinery that is in-service, in-standby, or in the warehouse.... [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
ROYAL PURPLE GREASE
Registered Member I used it as a novelty. I needed more support from maintenance team on P.M. program. Had vendor come in give his demonstration and walked through plant. The team primed him with failure stories and he b/s them with miracle cures for them. Long and short is that I buy buncha overpriced Lubes. The team does good Pm work for 4 months. Salesman makes buncha money selling snake oil. Plant reliabillity raised, and downtime dropped for 6mos to year. machines win I win... Well worth the investment ... [ more ]
Registered Member I have heard for years the claims by Royle Purple that their grease "fixes" vibration problems in bearings, but have not seen any actual tests to prove this. I suspect most of the success is selecting the correct grease for the application instead of any inherent qualities of the grease. Many of the plants I have visited use any NLGI #2 grease they can find without regards to the oil viscosity of the grease, and this may be causing the failure problems in the equipment to begin with. If they... [ more ]
Registered Member My experience with Royal Purple has been very positive. We applied the grease to some large scrubber exhaust fan bearings that had been failing about every 8 months, and last I heard (I am no longer at that location), they were still running after 5 years. Now, I don't know how it performs in bearings that are on the brink of failure. The fellow who introduced me to it (a technician whom I sat next to at a seminar) said he had success with it - at least in delaying failure. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Gearboxes
Registered Member It depends on the results of failure. If this is a little box and is not that crictical I let them go with an external inspection to see if they were leaking oil. If crictical I put them in the oil analysis program and follow those guidelines. Clint Mileur [ more ]
Registered Member General answer is easy - it depends! more specifically, I have looked after some critical reducers on process reactors where we decided to do periodic filtering. We sampled monthly and when the parameters (usually ISO count) went above the threshold we would trigger a PM to go filter. We would filter until we got below the clean threshold we set and then go back to monthly sampling. This allowed us to keep the oil cean to our specs and still have some idea what was happening inside. Yes you... [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Oil leak
Registered Member looks like it has been an issue since overhaul 3 months ago(?) when you examine seal and shaft let us know the outcome , good luck . [ more ]
Registered Member Dave, The oil mist eliminator on the reservoir was removed off during our first attempt and still it is off. Valve, Yes. I also suspect the same excess splashing off from the bearing. Let me check the bearing during next opportunity. [ more ]
Registered Member drain holes - OK garter srping - OK orifice - OK the hypothesis i can draw from all above normal findings is, the amount of oil splashing directly to the seal from the bearing is now larger than before resulting higher work rate of the seal. how? could be due to alignment quality, bearing clearance, etc. what ever the cause is, it seems the safety factor of the seal is very low. possibility of fire is zero unless you hv something like more than 250 deg C of skin temperature close to the leak... [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
filtering
Registered Member I will dig into the exact filter size with our lube supplier. We are a sand mine/processing facility and have lots of issues with contamination! Thanks! [ more ]
Registered Member I just re-read and see that you are looking at storage and filtration of a multigrade engine oil. Your application is probably not required to be quite as clean as we like ours to be, and you will not want to filter out the VII co-polymers in the oil (not sure what size they are 'though). I think that the 5 micron size suggested will clean up your oil to sufficiently. [ more ]
Registered Member We store a large quantity of bulk oil for our tubines. We always filter and sample when we get a bulk delivery. As a precaution we always filter and sample the oil before making a top up transfer to the lube oil systems. The oil we get in bulk deliveries is no where near clean enough to put into the lube oil system. we use a 1 micron filter for this application and do not do any reoutine filtering other than that. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
is SKF lubrication grease a OEM product?
Registered Member It depends on how you chose to define "OEM". Typically that means "Original Equipment Manufacturer" and means the maker of a complete machine made up of numerous components. A gearbox for instance may have been made by "XYZ gear Company" but has components that include bearings made by SKF. XYZ Company may specify a grease generically (with no manufacturer name)or as a specific product (Mobil xxx, SKF xxx, etc. You could also ask SKF for a recommendation although I recommend you defer to the... [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Minimum Motor Size for Greasing
Registered Member What does lubrication have to do with the size of the motor? The only correlation I can see there, sceptically, is the commercial one associated with making such motors disposable items. Tom [ more ]
Registered Member Thanks Dave, I believe, hearing more of the story, that this is specific to Toshiba motors. Aubrey [ more ]
Registered Member I've seen motors no bigger than the soze of a home furnace that greased, and one 800 HP that had sealed in it. I don't think frame size has anything at all to do with it, unless that particular motor OEM decided to put all sealed bearings in motors from frame size 280 down. I could be wrong, but I think that statement would be OEM specific, not industry specific. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Electric motor Over-lubrication
Registered Member Thanks Dan..! And a Merry Christmas to all of you out there...!! [ more ]
Registered Member Guess what happened now? We just lost another motor to under lubrication. I suspected as much, because the same thing happened to another motor the same size about a year ago... Both motors were only a year or so old. Motor shop confirmed it two days ago for me, <drat> Talk about throwing money out the door... [ more ]
Registered Member Here you go Rod. www.uvlm.com/ If you've never witnessed it, try to capture the look on your lubricators face the first time he hears the grease hit the bearing. Keep on Rockin'! [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
High temperature in turbine oil
Registered Member from what i had so far for turbine/compressor, normal vendor practise: 46 deg C for ISO VG 32, 52 degC for iso vg 46 oil, as for vg 68, if have not encountered yet but 58 seems close to its ideal operating temperature. you can always refer to viscosity vs. temperature chart for all viscosity grade. if you see no abnormality after running more than 1 day at current temperature, then it should be ok. one of the thing that i have experienced with if you have bad bearing desing is morton effect... [ more ]
Registered Member That is a big jump, I was thinking more of a smaller increase over a period of time. Akhtar's right. The biggest concern is viscosity in the load zone. The oil temp is the only variable to your lubricant film thickness. I would be concerned that you may not see the increase in temp in the bearing rtd's/thermocouples before you wipe the bearings. [ more ]
Registered Member Normal cooler outlet temperature is 40ºC, we are having problems at heater exchange because pipes are blocked for a kind of mollusk we have in our river. It is not a normal operation status, bearing temperature is near 70ºC (average). Inlet oil temperature is over 65ºC. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Phosphorus bronze bearing oil type?
Registered Member You're welcome. It's a tricky picture and certainly not all EP additives the same. I think I see what you mean on wikipedia. I'll post it here for posterity: http://en.wikipedia.org/wiki/E...me_pressure_additive "Sulfur containing EP additives can cause corrosion problems in gears with parts made of bronze, brass and other copper alloys when high temperature environment is encountered." [ more ]
Registered Member Thanks for the extra info pete, I also had a look on wikipedia and it doesnt look like the EP additives and yellow metals should be put together without some prior research. Could be a very expensive mistake for the case I'm referring to. Potentially 12 units with one bronze gear per unit at $140K ea. + 3 month rebuild time per unit. OUCH! [ more ]
Registered Member Hi all, Many thanks for all your interesting inputs, much appreciated [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Questions on Oil Analysis Test
Registered Member Xracer, it's most likely that normal OA reports didn't indicate failure because the particles were larger than 10 microns in size. Most spectro-chemical ICP tests do not register particles larger than 5 microns. Next time, try testing Total Magnetic Iron (or PQ Index) which is not limited to smaller sized particles. My next suggestion would be OPC or Ferrography. I realize this is a little late from your original post. Fluid Life just opened a new lab in your neck of the woods in... [ more ]
Registered Member Xracer, Yes, you need to define the OA tests for the particular application. The generic tests for the pump bearing lubricant oil are Viscosity at 40 deg C, Water content, TAN, particle count (ISO 4406), flash point. Proper sampling location and method are also equally important to get the most of benefit from your OA program. [ more ]
Registered Member I would be asking myself am I sampling the oil in the correct location? Typically before the filter and after the oil pump, not from the oil storage tank. You are correct about the labs, not all labs are equal, and they all offer different levels of analysis, each coming with additional costs. FW ferrous wear index, particle count, viscosity, water, are typical items used for diagnosing oil issues. WDA wear debris analysis uses a microscope to identify what type of metals or contaminants are... [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Wear Particle Atlas
Registered Member Hello Steve, thanks for the response and information. Much appreciated. [ more ]
Registered Member Here's a link to the Trico-Predict "Contact Us" website. http://www.predictusa.com/contactus/contact-us.aspx I got a copy of the Wear Particle Atlas from Predict when they were still separate from Trico. The part number on the binder is: EP076-0030. Hope it helps! Steve [ more ]
Registered Member Hello Lube mate thanks for the repy. I still have not had any success in tracking down the Wear particle atlas. I will appreciate any help or details you could provide. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Looking for and effective gearbox oil at extreme low Temp.
Registered Member Yes, Mobilgear SHC series lubes might work well. If quantity is small and cost is not a matter then KRYTOX lube may offer some solution. I am not very sure but you can explore on this. [ more ]
Registered Member In my days with a major gear OEM I did some research on gearbox lubrication at temps like -40 F. This was being done as we were supplying gearboxes for the Alaska pipeline. The products we finally decided on were the Mobil SHC series. The SHC is for synthesized hydrocarbon. Usually we picked something a grade or two less viscous for drives that were outdoors. What you want to do is minimize or eliminate what is termed channeling. This is when the lubricant turns solid and the gears when they... [ more ]
Registered Member I have a good customer who is in the food industry, and has flash freezers that go to -40 deg. F. They use two different types, both food grade (H-1). For the flash freezers, they use CHevron Tegra synthetic compressor oil, ISO 68. The main problem they have is water ingress, which destroys the gearbox before anything else has a chance to. Seems the sanitation department like to have the sprays right on the shaft of the gearbox underneath the drive cogs. For the coolers, which are at 0 deg. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
ISO code - 2 numbers or 3?? Which is best and why?
Registered Member Thanks Richard! [ more ]
Registered Member Thanks Pete! [ more ]
Registered Member I think if you are dealing with sliding numbers, the clearance may be on the order of 0.0005" or 10 microns, so the smaller particles are not of concern. I agree with you, for rolling bearings, we should not be ignoring the smaller end of the range. Then again, even at 4 microns we are still not getting the really important ones around 1 micron....right? I'm not sure why it is that we don't go even smaller... guess it could be some of the reasons you mentioned (repeatability) [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Hydrodynamic lubrication
Registered Member if it is cyclic i.e this month you get high next month you get low, and similar trend onsubsequent months, then it is mysteriously weird. you might want to share what equipment you are referring at. i bet the oil is not only for bearing it could be for sealing too.. if you have only 1 cycle, your lube oil analyst may have gotten wrong sample in pne of the sample [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Oil rings wear out
Registered Member Hi Thanks for your comment.We are planning to replace the oil rings to flinger disc [ more ]
Registered Member I know there is big long checklist of things to go after when chasing dark oil, and many of them are related to wear in the rings. Check oiler level setting is correct. As I recall EASA guidelines are there should be 1/4 to 3/8" between the inner radius of the bottom of the O-ring and the oil level. Inspect for erratic operation (bouncing off the surface... jumping out of the groove) while running. Check for roundness of rings. There are many more items to check which can cause dark oil-... [ more ]
Registered Member Check with your suppliers. There are fiber reinforced polymer oil rings available. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
High Fe content
Registered Member SKVN, Did pump pressure affected? increase or decrease? If you are experiencing this then the result substantiate wearing of the impeller vanes if not please continue to track the increase wear. possible sources of iron from pump are casing, impellers, pipes and ingestion. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Oils operating at temperature between 105-115 Cm tilting pad bearings
Registered Member Pete, Many thanks, that is very useful. I appreaciate your detailed advice. [ more ]
Registered Member I don’t have any experience with high temperature applications above 100C. Here is just some basic info fwiw. I think if you are operating above 100C you will undoubtedly need to look a synthetic lubricants, since conventional lubricants will age too rapidly at this temperature. “Lubrication and Lubricant Selection” by Landsdown table 4.4 provides an overview of some relevant properties for selection of synthetic oils. For various synthetic oil types he tabulates: Maximum temperature absence... [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Who sells "in-house" oil analysis software?
Registered Member Warning Vendor reply Emerson/CSI offers a LIMS module A475101 to find your contact click on this link and enter your zipcode. http://www2.emersonprocess.com...Pages/ContactUs.aspx The Lab Information Management System (LIMS) is a comprehensive oil analysis management application that imports data from most oil labs. It offers automatic reporting and distribution, detailed sample tracking, and a custom address book. Use of the LIMS package results in an efficient, versatile oil analysis ... [ more ]
Registered Member I sent this up to someone better than I am at Reporting software. Here are their comments: _____________________________________________ For oil analysis data tracking: Lube Track- www.lubetrak.com (this is ONLY for oil sample data) Oilography- http://tf7.com/TF7Website/Applications/Oilography.asp DMSI- http://desmaint.com/solutions/...dmtn/lubrication.htm Oilview- software from CSI but I cannot find a link Full integrated reliability solutions: DMSI- www.desmaint.com TF7-... [ more ]
Registered Member Hi Vendor Alert! MAINTelligence from DMSI automates the full oil sampling cycle, from sample label generation through to final report generation. MAINTelligence already has an interface to Predict's oil analysis service - you can continue to send your samples to Predict, get back data files from Predict and import the data directly into MAINTelligence. Design Maintenance Systems Inc. Regards Steve [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Frequently lube oil viscoisiy increased
Registered Member If your testing is done on-site, I would wonder about technique, including temperature correction discussed above. If your testing is done by a lab, I wouldn’t think temperature correction should be a problem. If viscosity is really changing, I would discuss it with your oil analysis lab to help you figure it out. It would probabably be some type of contamination effect or less likely some type of aging effect due to temperature, possibly oxygen and moisture. Either way there should be clues... [ more ]
Registered Member Temperature related effects? Irshad [ more ]
Registered Member Recently I saw this go the other way in a forging machine, the gear lube was iso 220 and we found iso 46 hydraulic oil leaking into the gear lube, vis went down to 180 cst. Suggest you look for heavier vis oil leaking into your Caletx 46. [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
effect of external jacking oil pump on stability of lub oil layer
Registered Member The average pressure over the bottom half bearing circumference is given by unit load P/(W*L). Typical design is 50 - 300 psi average unit loading. Local pressure can get higher since pressure is not uniform, and also due to transient effects. According to an article by Malcom Leader it is not uncommon for peak local pressure to approach 1000 psi in a heavily loaded bearing. The material limits for babbit are tpyically on the order of 1500 psi. The machine should be designed to limit well... [ more ]
Registered Member Dear irshad, What is the pressure of hydrodynamic oil film layer. [ more ]
Registered Member If jacking oil enter through cavities at some angle to bottom, most of the oil will be drained out due to high clearance in that area. Jacking oil may also enter through a single cavity along the bottom of bearing. Jacking oil pressure is high but oil film wedge pressure in hydrodynamic film is much much higher. Also, flow of jacking oil is very less. It is not going to create any instability or lubrication problem. Irshad [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Air Compressor tripping the breaker
Registered Member My bet is on a stuck or otherwise non functioning unloading valve. D [ more ]
Registered Member I can't imagine bearing grease to be the issue. Did you verify the compressor condition is good? Can it be rotated by hand? Is the lubricant level correct and quality good? Walt [ more ]
Registered Member Is over-greasing a problem at your plant? If it was just over-greased then it may be likely that the overpacked bearing is causing high inrush current which in turn trips the breaker. It takes some time to damage the windings enough to cause an instantaneous trip. It is also possible that the breaker instantaneous trip setting is too low or malfunctioning. I would troubleshoot in this order: 1) megger the cable/motor; 2) take inrush current readings and if they are with-in 10x of the FLA, if... [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Hot pillow block bearings
Registered Member Don Thanks for the link. Just as the authors stated in the article, our mechanics also tightened the belts using a belt tensioning device using Fn measurement. This device is still a fairly new unit for us and was not there that day to oversee the procedure. A thermograph was used to identify the "hot" DE bearing but most of the article dealt with L10 calculations rather than efect on temperaure (or did I miss something?). The article also showed only the DE bearing having high temperature... [ more ]
Registered Member I have seen the overtigtening of v-belts create excessive bearing temperature. Vibration was smooth but later the bearing failed. High frequency, gSE started to climb then the failure mode continued. Think of the amount of pressure/stress being applied to the bearings if the belts are overtightened. Bearing training classes have mentioned this too. To tight of belts can really create heat and then add with that maybe overgreasing and you could have a great deal of heat. I'll see if I can... [ more ]
Registered Member Don The other fan has been running for over two years since it was overhauled. I dont think the belts were overtightened. We've set up a good procedure for belt tensioning, alignment, runout, etc. Do you have past experience of overtightening belts causing excessive heating of the bearings?? I've nev er read about that before. Right now I'm on vacation in OBX so I dont have actual readings to provide off top of my head...I can say that the baseline readings (velocity) were very normal...but... [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
Compressor OEM Oil Replacement
Registered Member Update- we changed to the Lubrication Engineers LE6802 oil and it cleaned the system of a bunch of accumulated contaminents and the compressor is running fine. I'm trending pressures and other process parameters from the installed computer module and all looks good. Atlas Copco won't talk to me any longer but what the h__ll. They will be even more pleased when I recommend the rest of our plants to go with the LE6802. Does anyone know if Atlas will buy back a bunch of drums of their stuff? [ more ]
Registered Member We have been down this road a few times. Be sure to follow the new oil companies flushing procedures or you will run into possible foaming, overheating, varnishing and or compatibility issues. We switched over from IR Ultracoolant (@ $5,000.00/drum) to Mobil Rarus 1025 (@ $1,300.00/drum). We had to add Mobil's "System cleaner" for a few hours, drain the systemn and then run an 800 series (I think) oil for a period of time. Drained the system and filled with 1025. Its been running at the same... [ more ]
Registered Member rgf12, Exxon-Mobil claims that I-R screw compressors will run fine on Rarus 1020 series oil. Pay attention to flushing procedures. David [ more ]
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Asset Condition ManagementPosts About Lubrication and Oil Analysis
just thought id share
Registered Member It is interesting that the units did not rum very hot. We has a Falk unit driving a large vacuum pump that ended up overfull. There was two crews working the outage, one drained the oil out and the other filled them. Some how, this one did not get drained and did get filled. I guess they assumed it was empty and they did not check the level. After running 20 hours, the outside temp on the casing was above 300 degrees F. We drained out 40 gallons of oil and let it cool naturally. The next... [ more ]
Registered Member The "roll eyes" smilie is meant to display sarcasm. [ more ]
Registered Member More is not always better since due to churning bearing heating takes place instead of cooling. I have also seen such practices in horizontal pumps thrust bearing housing oil top up where the mechanic topped up oil through breather hole instead of constant level oiler and overfilling caused oil seal to leak. By the way, Just, do you also use constant level oilers or any other tool to ensure optimum oil level? Regards Irshad [ more ]
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