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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Crusher vibration problem
Registered Member I already suggested for motor pulley unbalance.Thank you very much for discussion you had with me in last two days. This forum is really helpful [ more ]
Registered Member If motor vibration has a high 1X, uncoupled, it must be unbalance of the motor or pulley. Could also be caused by a bend axis or poulley. The reason that levels are lower when coupled is that the belts 'hold down' the motor and create more stiffness. [ more ]
Registered Member Inspect motor pulley eccentricity for possible contributor to high 1 X [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Gas turbine - Compressor blade damage
Registered Member In this case, we test micro structure of blade we found some micro crack on blades tip start point of fracture and found vibration phase change after HGPI. and talk with OEM.>> rubbing is cause of fracture. But, a cause of rubbing, we're finding together with OEM. In normal case of rubbing is show in compressor blade clearance and rotor position but in this case compressor blade clearance and rotor position is not problem, it's on criteria. OEM find RCA around 3 month. Now we don't know. [ more ]
Registered Member What caused the rubbing? [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
repeated bearing failure for screw compressor
Registered Member possible causes: 1\ insufficient cooling: the screw pump has cooling liquid jacket so that the the liquid flows into the pump and cool it down. The outlet temp of the cooling liquid is around 80C (did not check the inlet) so i thought may be it is appropriate to install chiller to cool down the cooling liquid (the pumped product in our case Paraxzylin) today we had a meeting with the vendor and surprisingly he said the cooling is optional (the pump can run at 150C without cooling) which... [ more ]
Registered Member Yes I just replied. Thanks, Regards, [ more ]
Registered Member this pump was overhauled last April and again the same failure occurred in July. previously four pumps have similar shaft jamming. same scenario [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Mechanical Breaker failures
Registered Member In addition to the fatigue of a spring and having a routine maintenance program that can we dictated using Weibull and Crow/AMSAA growth plots to help in determining frequency of the PM. There is another issue you may want to check into that can also cause this failure, it is the use of DC voltage on and AC rated relay. It is possible to use mixed voltage on a relay, however, there needs to be a conversion to calculate proper holding current needed for the different voltage, and proper... [ more ]
Registered Member If fatique is considered a fixed time failure, then replacement is the PM action, isn't it? Not sure if condition monitoring such as thermography applicable here. [ more ]
Registered Member Since it does appear to be a fatigue type failure mode/mechanism it could be said it was expected, however, it was not identified as a failure mode resulting in no PM/PdM to predict potential failure condition and prevent unplanned downtime. Currently reviewing a timing test of the breaker to confirm the integrity but would like to know what other operations are doing, for example is thermography a possible option to assess the health of the breaker? [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
help about problem when downloading from 3500 system configuration to 3500 rack
Registered Member Thanks everybody. I've fixed this problem. It because 3500 configuration software only support config one 3500/92 module per time. I've uploaded program from rack then remove one com92 module from 3500 software(vitual) after that i've configured for new 3500/42M module and download it to rack. Everything is ok! [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
VFD Drive Equipment vibration
Registered Member Do a Google search on vfd drives vibration and you'll find plenty of resources that address your question. [ more ]
Registered Member In an AC induction motor. speed will vary according to: Synchronous speed (rpm)= 2 x Line Frequency (cpm)/number of poles. There will also be a small amount of slip (less than 3%) dependent on the load. The most common example in the US would be: A 4 pole motor with standard AC supply. Synchronous Speed=7200/4=1800 rpm. Slip would be around 10 cpm so your running speed would be approximately 1790 rpm. So your speed will vary as will all your predicted fault frequencies. Sympathetic... [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
pillow bearings running hot
Registered Member It's better to determine the Root cause. What temperatures are you seeing, has the machine always had excessive temperatures or has this only recently started to occur. What is the brand, size and sealing arrangement of the Pillow Block. I have seen contact sealing arrangements in integrated pillow blocks such as the Dodge grip tight used in high speed applications (such as fans) cause high temperatures [ more ]
Registered Member Blow it on the shaft instead. Blowing it on the bearing cools the bearing housing and shrinks it on the hot insert. Cool the shaft and allow it to cool the bearing from the inside. Better yet, find out why the bearing is hot and fix it. This is an extremely expensive way to cool it. [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
HVAC loss of containment
Registered Member As per my last post, it will some time before we have the actual MTBF of each system, hence, wanted to provide some information on the status, etc. instead of waiting any longer. [ more ]
Registered Member We are actually in the process of filling in failure modes on a spreadsheet as per each failure incident using CMMS data, etc. as the starting point, still a lot of work but we have a few people working on it. Agreed on your last post, with the failure history we do have and once the information is collected in the spreadsheet, this information will be used as part of an asset strategy review such as a RCM based or PM Optimization analysis. Currently in early discussions with a reputable... [ more ]
Registered Member At least the existing situation can be defined by analyzing the current failure modes and MTBFs. What do think? [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Electrical Fluting? If so, what is the electrical path?
Registered Member Yeah I have come across something similar. The ones I have seen have been in paper machine drives with the current not correctly going to ground but going through a drive shaft and into gearbox input shaft bearings. Have also seen in a motor that drives a vacuum pump with gearbox in between and the gearbox bearings and gear teeth showed signs of fluting. I think most issues were caused by incorrect grounding so I think you might want to look into that. If that doesn't help then you would... [ more ]
Registered Member Please share the spectra of the first case and the other of the ongoing status to share experience. Thanks GHEATY [ more ]
Registered Member Dear Pine I'd experienced a similar case a year ago with forced draft fan with VFD. Generally, the electrical charge flows through shaft to bearing then to motor body finally to the ground. unfortunately in your case motor and pump have same structure so I think the best solution is to use shaft grounding ring "SGR" which can help to dissipate the charge without affecting the pump "structure". There are other solutions ,but sometimes not valid, to use ceramic bearing or to coat the outer... [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
FPSO Swivel Gas Leaks
Registered Member The seals have not been replaced or any intrusive inspections to confirm condition unfortunately. The operation is living with the gas leaks since the leaks are not severe and are continuously monitored. This is the suspected failure mode. Therefore, no pictures of the seals and limited drawings. Even if there were pictures (and drawings), I could not share due to confidentiality agreements. [ more ]
Registered Member Have they been replaced? Any pictures or diagrams of the swivels? [ more ]
Registered Member The gas leaks are believe to be in two locations, on the gas lift and gas injection core lines between the water injection and gas injection swivels. There are seals between the swivels connecting the core lines which are believed to be leaking. The assembly error was, I believe, caused by installation at the site. [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
DHDT RGC Drive Turbine (BHEL)
Registered Member We have analysed the vibration data. The turbine trips on RJB high vibration. The spectrum indicates pure 1x and the rise of 1x causing tripping. There are no reverse precession component in full spectrum and the orbit becomes more circular during tripping. There are no major changes in phase also. However, on FJB side, during tripping, the orbit becomes highly elliptical, indicating preload. There are reverse precession 1X component in the full spectrum. All in all the vibrartion analysis... [ more ]
Registered Member Carbonizing of oil causing intermittent rub Poor water chemistry causing deposit buildup on steam glands resulting in rub Electrostatic discharge although from description the duration is too long Electrical malfunction (instrumentation related); again duration likely too long Like Dinh said "...the vibration data would be of help to find the cause in this case." Otherwise, nothing but guesses. [ more ]
Registered Member I think that the vibration data would be of help to find the cause in this case. [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Lower temperature limits for standard steel DGBB's
Registered Member My understanding is that standard ball bearings with electric motor grease are fine for temps down to -50C, although the grease ay be noisy during a dead-cold startup. From there the bearing warms up a bit. I have not studied lower temps than that. At -80 you're definitely in a different realm. You said you talked to your bearing supplier, but by the sound of it you're talking with a distributor. Distributors would be more than happy if you buy the bearings and try them. To get a less blind... [ more ]
Registered Member That's a cryogenic service. Is it LNG plant? Can the OEM tells whether the steel has been used elsewhere? [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
high 1X and 2x amplitude is half of the 1x.old repaired pump was placed.still same va
Registered Member can you say the number of impeller. [ more ]
Registered Member please give details about the i.e. axial, vertical and horizontal values... check for the Motor problems. sometimes these values influenced by the motor problems. As you are saying you have replaced it with new then check the motor. This is the possible cause. [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
A screw compressor was seized
Registered Member Dinh! You’re right! So we are waiting the analysis result. For further information i will post what i have. You known without knowledge of the machine this is likely too much of a guessing game. Regards Vastocean. [ more ]
Registered Member The bearing is rolling element bearing, isn't it? If so, the clearance is very tight. It is not exactly the rule but normally, clearance of compressor must bigger bearing clearance. [ more ]
Registered Member Dear Dinh! We sent them for analyzing but not yet receive a result. Regarding the bearing clearance we checked yet. But we do not have compressor’s clearance, so that no way to compare. Regards Vastocean. [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Gyratory Crusher Failure Modes
Registered Member Hello Wendy, Not sure if you are still working on this issue, only came across this posting today. I would agree with Bill on his posting with regards to potential failure causes. In my previous position, I was a Reliability Engineer with an Iron Ore operation and had a similar failure except our crusher was in operation for a number of years, not a new install (the mine was in operation since the late 50's, early 60's). During the investigation, it was noted that the eccentric bushing will... [ more ]
Registered Member Hi Wendy, I was wondering if you ever able to establish the root cause of the failure? [ more ]
Registered Member Hello All i have some problem in my site there is a lot of oil leakage from around of gyratory crusher main shaft, also after remove air blower line from crusher discharge oil from that. what is my problem?seal ring damaged?main shaft o ring damaged? pls help me [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
compressor bearing failure
Registered Member Dear All, We are experiencing an increased temperature and a buzzing sound in two of our four ammonia compressors. From the vibration spectra gathered, we have identified peaks on the bearing faults frequencies and reported for a bearing replacement on the motor bearings. Hope you could give me your advise and opinion on this. Attached are the spectra. Regards, Philip [ more ]
Registered Member MARIO, I AM SORRY. I DO NOT AGREE WITH YOU. FROM YOUR POINT OF VIEW FACE TO FACE ARRANGEMENT IS MORE RIGID. RATHER, BACK TO BACK ARRANGEMENT IS MORE RIGID. can be confirmed from skf webste. WHAT IS THE CONTACT ANGLE OF THE BEARING? THERE MAY BE LESS PRELOAD THAN REQUIRED AS PER THE CONTACT ANGLE. WITH INCREASING ANGLE LOAD BEARING ABILITY INCREASES. LOCKNUT SHOULD BE TIGHTENED TO REDUCE CLEARANCE TO ZERO. IRSHAD [ more ]
Registered Member Dear I believe the bearings are mounted with the thickest part of inner ring in the middle, becomes more rigid mounting. When the shaft is measured from 70.001, 70.002 I think it has little grasp, given that 1 to 3 microns in diameter is insignificant to me that would be 15 to 25 microns. Checks if the oil return channel works, you can have oil injection but he did not leave and then carbonize. Regards Mário [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Low Steam Turbine Performance
Registered Member Go to http://turbolab.tamu.edu/proc/...oproc/T42/index.html and then scroll down to the Case Studies section, specifically CST13: Successful online and offline cleaning of steam turbines without disassembly by Bladimir Gomez (PDVSA CRP Refinery) and Barry Snider (Small Hammer Incorporated). There is also content at http://turbolab.tamu.edu/proc/...proc/T33/index.html; scroll down to the Lectures section, specifically page 57 and the title NEW TECHNIQUE FOR ONLINE WASHING OF LARGE... [ more ]
Registered Member When is the last time the steam turbine is overhauled? Is water treatment and cooling water treatment proper as per specifications? Have you checked the troubleshooting guide by the OEM? [ more ]
Registered Member Carry out a borescope inspection [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
IGV servo valve troubleshooting for Siemen Gas Turbine
Registered Member Dear K.Saroch this alarm should not trip the gas turbine as I know. anyway, this is because a difference between command and feedback. let's consider the command is 5% with a deviation as usual 1% and the feedback is greater than total 6% or less than 4% (6%=5%+1%)(4%=5%-1%). switches from both sides is controlling the process. adjust your switches to meet the command so that the feedback will be exactly as the command or look into your actuator there would be something wrong inside. [ more ]
Registered Member Yes, we did. We already checked by minimum to maximum and reversing. The IGV has worked so well. By the way, we have same problem with another unit and with another power plant. Thanks K.Saroch [ more ]
Registered Member did you calibrate the IGV's after installing the new servo? You should to minimum to max check (27 to 88 deg or whaterver the values are for your unit). [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Constant Oiler location in centrifugal pumps
Registered Member Higher oil level is bad as lower one, but less severaty. Higher level will negatively impact oiler lubricated ring totation and make it slower. No enough oil amount would feed bearing. Other impact is: higher oil means higher potential for oil oxediazation. It will be appeared by oil dark color. All above statment have been approved physically. [ more ]
Registered Member If the oil level is too high this may increase the temperature of the oil lowering the viscosity, furthermore this may cause splashing or foaming of the oil. [ more ]
Registered Member Thanks it is very much useful for me. Could you please clarify me what would be adverse effect on both journal and ball bearings,if the oil fill is more than limit in bearing housings. Hope i can hear from you in soon. [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Non Drive End of DRUM SHAFT failure
Registered Member I agree with pine and Aubrey welding a repair to a badly designed shaft, has added to the shafts potential for failure with significant carbide precipitation in the heat affected zone. Start again, with a well designed shaft. Don't keep putting band aids on a broken arm or shaft in this case. [ more ]
Registered Member I agree with Pine, The cracks look as though they originate at the gusset weld. Was there any stress relieving done after the weld was applied? After building conveyor pulleys, we would run a peening gun over the welds to help relieve stress. It is hard to scale the image but I think there are 3 passes on each gusset. How quickly was each pass welded and how much time was allowed between passes? I don't see any undercut on the long runs but could there have been weld undercut on the returns? [ more ]
Registered Member Look into the welding procedure. It appears the cracks initiate at the welds for the gussets. Also, based on a small final fracture and slow moving fracture, I wouldn't say overloading was a significant issue. Possibly alignment because of the rotating bending fatigue. [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Motor High vibrations
Registered Member Same modifications also done in stand by machine but it is still working good. Latest update of above mentioned problem: We have stated on 05 may 2014 then machine running fine with normal vibrations 26microns and 35 microns. But we had done nothing on the machine between two trails. [ more ]
Registered Member Has the soft starter been bypassed and the motor starting DOL? In this case, motor will draw huge starting current which may cause the rotor to bow thermally and increase vibration to trip point. The rotor may have developed hot spots. Post a velocity spectrum to cover RBPF and another velocity spectrum with high resolution and low Fmax. Carry out motor current signature analysis. [ more ]
Registered Member Machine was commissioned in Nov'2010. This machine was in operation during Feb'14 and March'14. But due to requirement of Elec Maint for changing the settings in soft starter this machine was stopped. After completion of electrical jobs, trail run has been taken for 15-20min run lengh. But 29th April we have started the machine again for long run due to some problem in stand by compressor. [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Plan-53B pressurization: more than discharge pressure
Registered Member Yes, we have replaced the gauge but no result. After that we have opened the bladded and it was found that bladded was having hole. I think beacuse of primary leakage pumping fluid enters seal pot and becacause of increase in temperature of buffer fluid pressure is getting increased. (beacuse of vapourisation of naptha) [ more ]
Registered Member is the reading of 15 - 23 bar, valid ? had you try to change the pressure indicator ? [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
ROOT CAUSE BEARING FAILURE
Registered Member @ Danny: Bearing housing is water cooled. Normal temperature of the housing is around 80 deg Celcius. Lubricant is ISO VG 46 quote: Originally posted by Danny Harvey: Why did you ask? I was completely disappointed with the kind of response from maintenanceforums. I started the thread on 6th march 2014. I visited the forum every single day till March 15 hoping for a reply. Finally I lost hope here and went on to prepare my failure report. [ more ]
Registered Member Where is this procedure coming from? putting shim in between inner race with Back-to back is something not right IMO There are SACBB manufactured for this set-up that has a preloaded condition once mounted. also right method is critical depending on the arrangement to ensure proper instalaltion. Also check the the effect of the temperature with regards to your fits and tolerances used. [ more ]
Registered Member LOL that's a good question seeing the dates D [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Centrifugal pump motor overload tripping
Registered Member Just to add one more thing. I have analyzed FFT spectrum of pump which is also giving clear signs of pump cavitation. Raised floor at and beyon VPF. [ more ]
Registered Member Plz find the snap attached. Regards, Syed Sajjad Ahmed [ more ]
Registered Member Hi Ahmed, Can You share eroded impeller/casing snaps to understand the severity as well as Pump performence curve. [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
High vibration in direct coupled blower
Registered Member thanks Dave for your reply .the fan blade is mounted on motor shaft. the vertical vibration is 5.4 mm/sec.my doubt is if it is base related problem then vibration should come in no load condition but in no load it is very less . need to check bent shaft and resonance issues . [ more ]
Registered Member Vidya, When you say direct coupled, do you mean fan blade mounted to motor shaft, or motor/coupling/fan? The most likely cause is a weak machine base. This could be caused by loose anchor bolts, cracked welds or a natural frequency/resonance issue. Is the ratio of vibration from horizontal to vertical high? If you have 16 in H direction what is the amplitude in V direction? When you say balance is "good", is the fan wheel balanced in the machine or is it balanced by itself? Have you checked... [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Support required in finding RCA of Screw Compressor Rotor Failure
Registered Member It looks like rotating bending fatigue. Is there a machining groove or step on the mating broken piece? Was there an alignment report or issue? [ more ]
Registered Member How long has the rotor been used? What is compressor's maintenance history? Any major breakdowns or overhauls in the past? What is the driver, is it a motor? What size is it? What can bend or twist that rotor shaft? [ more ]
Registered Member What type of failure is it? Is it brittle or ductile failure or fatigue with striation marks? Have you sent it to a metallurgical lab for failure analysis? How long is the rotor and its diameter? Do you have the rotor drawing wits support bearing locations? [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Oxygen centrifugal pump bearing failed
Registered Member Dear ERM: Thank you [ more ]
Registered Member I spoke with a technician at the oxygen plant. He told me, remove seals and clean them and the bearing with some cleaning agent. There should not even be an fingerprint on the bearings. Lubricate with the Kluber grease. Put seals back. But in your case, maybe you should fix the root cause first. There should never be pure oxygen in contact with bearings. Maybe you have an bad seal in the pump? I hope this helps you with your problem. [ more ]
Registered Member Dear ERM: but please note that bearing used in our pump is 2RS type (pre- greased and sealed). [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
NU324 Electric Motor Bearing
Registered Member Hello this looks like vibration damage While the machine is turned off. There are nice Pics. On the SKF website (bearingdamage) it looks like your type of damage. Mikael [ more ]
Registered Member This may happen as the machine does not run all year round, however there would be no other machines running at that point either [ more ]
Registered Member I am curious as to why there is a cylindrical roller bearing on the DE of this motor...is it a belt drive? The shiny lines parallel to the centerline look more like disassembly scratches than fluting. Like noknroll said though, could be VERY early stage. But I've seen those same marks on poorly handled cylindrical roller bearings before-assembly/disassembly scratches from allowing the race to drag on the rollers. There are a number of small black pits that do look like electrical pitting. Do... [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
PINION GEAR DAMAGE - BUMPS
Registered Member Are these bumps randomly dispersed across the tooth flank? In other words extending from the root up to the tip or is it more or less a singuler line across the flank (end to end) and about 1/2 to 2/3 of the way up the flank as measured from the root. There is a good pdf file discussing gear related distress at http://www.richardscompany.com...Drive%20Failures.pdf . However, not all types of failure modes and their identification are covered. You may wish to get a copy of ANSI/AGMA 1010--E95... [ more ]
Registered Member Can you post a photo? [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
unidentified broken connecting rod cause
Registered Member Any vibration report or oil sampling reports. Was the connecting rod bearing found damaged? From which point exactly did the rod break? Can you provide photos of the broken rods? Vibmaster [ more ]
Registered Member There are some reasons of connection rod fail. The first and most common reason is the compressor was run low on oil. If the unit is not properly lubricated the rods will fail quickly. To determine if this was the cause you will need to disassemble the compressor. Then inspect the bolts and replace the damage part and inspect the bearing journals. If they are not smooth, I recommend ordering a new crankshaft. [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Pump shaft broken
Registered Member I like it when I'm right . Thanks for the feedback, we all learn and it completes the loop. [ more ]
Registered Member You are right Bill, The pump shaft was broken, beacuse at that time, the surge tank of the pump house was not in use. Raman [ more ]
Registered Member It's really hard to take out the pump shaft broken in just two days. Generally pump shafts breaks mostly because either they twist, bend or they wear out. [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Screw Compressor Abnormal changes in Temperature
Registered Member Hi Rookie, Thanks for the early response. Base on the attached troubleshooting guide, the probable cause and correction of the problem in "temperature fluctuates" is the: 1. System conditions rapidly fluctuate causing liquid injection system to overrespond. Stabilize system operation. 2. Check calibration and operation of motor valve - Adjust P & ID setpoints for analog output Possible the liquid or oil system over respond. IMO, the correction is too general. We have installed a... [ more ]
Registered Member Hi Franz See attached file , hope that will help . Thanks Regards, rookie [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
damage of circulating pump
Registered Member Many vibration problems occurs due to interactions among a system's motors, pumps, fluid, piping and structure. Also neglecting neccessary precaustions during pump installation can cause vibration issues which are expensive and time-consuming to sort it. -- Guma Tech [ more ]
Registered Member I assume the thrust bearing is on top of the motor? There are a variety of causes to consider - examination of bearings and runner would be a great starting point (got any pictures?). Do you have bearing temperature monitoring? How many pads and what part of the pad and what does it read? Do you have radial pad bearing temperature monitoring and if so how are the radial pad temperatures? Without being methodical to narrow it down, some shotgun possibilities might include; abrasive... [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
rolling bearing failure analysis documents
Registered Member Here is another one. I guess it´s for trucks but it looks the same inside. http://www.generalbearing.com/...iles/Hyatt%20BFA.pdf Olov [ more ]
Registered Member Electricpete After downloading all the posted links from your post i felt that i have to thank you for these invaluable documents. Thank you so much. Best regards Yousef [ more ]
Registered Member Pete, would you be able to share your Kingsbury material once again? [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Microscope attachment for Camera
Registered Member Yeah I was looking at these, however I wasn't sure whether a 2MP camera would be good enough [ more ]
Registered Member There are cheap usb microscopes that connect direct to computer. http://www.amazon.com/s/ref=nb...words=usb+microscope Of course, requires you to bring the part to your office (or else your laptop to the part). Not ideal, but seems like a neat toy. [ more ]
Registered Member One method I have used over the years is a reverse mount adapter. For a Canon DSLR one is shown at http://www.amazon.com/Fotodiox...ameras/dp/B001G4PA36 for $7.50. The adapter fits into the camera body and then your lens screws to the adapter using the filter threads, thus "reverse" mount. You can get really close macro shots but the downside is everything (focus and exposure) is done manually. That isn't much of an issue if you know anything about photography. You can also make get some... [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Increasing trend in axial positioning of the multisatage pump rotor.
Registered Member Thanks for your response. Thrust bearing kings bury JJ type bearing. Pump is brand new and the has been commissioned in exactly 1 year back. Ok while coming to the point of issue-If the thrust is higher due to increase in balancing piston clearance then the most softest material would get off initially. but there is no abnormality in Babbitt surface of bearing shoe. We observe a deep impression underneath of the bearing pivot and on carrier. [ more ]
Registered Member What type of thrust balancing device you have got? May be the clearance of balancing piston have increased resulting in higher thrust and higher wear of the thrust bearing. Vibmaster [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
Double suction impeller fitted in reverse direction in an axial split casing pump
Registered Member Attached here the pump performance at site: With observe parameters at site we have drawn the actual performance curve against the original curve. This is for your ready understanding the actual situation. [ more ]
Registered Member Instead of backward curved, the pump will behave as forward curved. Vibmaster [ more ]
Registered Member Impeller reversal will not give you less discharge and pressure and also it will make easily distinguishable abnormal sound. I have seen practical example. Are you getting the same discharge or there is a change in the point of delivery of water? What are the changes in parameters? Vibmaster [ more ]
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Reliability Engineering for MaintenancePosts about Root Cause Analysis
WDX pump seizure of pump
Registered Member Pipe/nozzle strain has been checked during alignment found ok. I dont have any doubt in assembly of the PUMP. [ more ]
Registered Member Sorry Walt, I was thinking about simulating of the reasons you stated below using ODS which caused the pump to seize. It seems ODS may be not applicable as per your explanation above. [ more ]
Registered Member Santoz, Google; lomakin effect This is the correct spelling. It refers to the hydrodynamic support provided by the water in the wear rings, and it affect the rotor natural frequencies (critical speeds or balance resonances). It is affected by wear ring clearance, as I previously mentioned. Here is one of many references from Google: http://www.mcnallyinstitute.com/05-html/5-04.html Be careful when folks throw technical terms at you like Lomakin Effect. Make sure the full explanation makes... [ more ]
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