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Asset Condition ManagementPosts About Asset Condition Management
AEGIS insulation Ring on Motor
RM Registered Member
Registered Member In theory....the stator of the motor is grounded via a wire in motor junction box going to an earth ground. This is designed to handle short circuit current to ground. There should be fuses/overloads that also protect the stator The AGEIS shaft grounding ring is not connected to the stator, just the motor shaft. This is designed to dissipate any voltage/current induced into the motor rotor while in operation. It is my opinion....that this style of grounding ring is not designed for dirty... [ more ]
Registered Member The ring is fitted internally due to the limited space between the motor and the pulley so removing it isn't seem like an option. I couldn't find an issue but curious to know if there is at all any problem with that as they are saying! [ more ]
Registered Member Sine, I can't see where the grounding ring would pose a problem with the direct drive motor. If you don't really need it in that application can you remove it? If nothing else make it last longer, for what they cost. [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
How to detect Centrifugal Compressor Liquid Carryover
RM Registered Member
Registered Member The effects of carryover liquid: impeller can be broken, very high vibration. posible causes: heat exchanger broken, the water traps damaged. Regards. [ more ]
Registered Member Thank you for the reply gents. What effect liquid entrainment will have on compressor suction and discharge temperature, pressure and flows keeping in view centrifugal compressor? [ more ]
Registered Member Greetings team, Very interesting question and appreciated the answer from Mr. Al- Shurafa. 1. Centrifugal compressor is oil compressed and separated the pressure gas or air is released oil free. 2. If liquid carry over, the oil drum level increases and no pressure gas or air is released. The high level alarms of oil drum is an indication of some liquid entered in compressor system. 3. The liquid can emulsify the oil system, if that is not liquified gases. 4. If such risks are there system... [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
Effectiveness of condition monitoring (vibration)
RM Registered Member
Registered Member Marmans, No expert, but thoughts to ponder, typically if you are either using or have been using vibration testing, someone is looking to change something, increased uptime/production, reduce downtime/lost product and the lists go on and on.... Make more output with the same amount of inputs, meaning equipment uptime/reliability allows for more product to be produced with same amount of raw ingredients and man hours One measurement is to find the top ten / dirty dozen bad actors within your... [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
Troubleshooting Guide For Rotating Equipment
RM Registered Member
Registered Member Hi Lucman what kind of rotating equipments you are mentioning it is a Pump, Compressor, Turbine or Gearbox? I am expert for this equipments Centrifugal and Reciprocating. [ more ]
Registered Member I would recommend the following: 1. Machinery Malfunction Diagnosis and Correction by Eisenmann and Eisenmann 2. Machinery Failure Analysis and Troubleshooting by Bloch and Geitner 3. Fundamentals of Rotating Machinery Diagnostics by Bently Good luck! Michael Meehan, CMRP, CRL [ more ]
Registered Member I would take a copy of that type of book. Then again maybe not... it might end up a best seller and I would be unemployed. [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
Vibration analysis of roots blower
G Guest
Registered Member Hi All, Can any one explain me exactly about the 2X peak and harmonicas and 4X peak and harmonics. 2X is understood that lobe pass frequency 2 times for one shaft revolution. But how the pressure pulsation happening 4 times for one shaft revolution? Lobe comes at the bottom of the blower take suction and top squeeze out the swept volume. It happens 2 times or 4 times? Thanks guys [ more ]
Registered Member Depending on the OEM if you get all the nameplate data and send it to them they will furnish rotor information, types of bearings, shaft speeds and other data so you can figure out fault frequencies. I put these in my vibe software and go from there. [ more ]
Registered Member we are also having a number of roots blower running in our plant with both twin lobe and trilobe designs... lobe mesh frequency is evident in all of them and is predominant one... Vib values of 4-6 mm/sec RMS is quite common in all the roots blowers [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
Cavitation in API process pumps
RM Registered Member
Registered Member Greetings Akashri, Mr. Kumar is correct in all the above, problem is now you have to determine which one it is and how to correct it. Most of the time I have found it to be a Engineering design issue by Turbulence, improper positioning of elbow, strainer etc.. but the best way I have found to determine this is by using an Ultrasonic leak detector head-set. Using this can help you determine the location of the cavitation then guide you to what you should be looking for i.e. bad pump seals,... [ more ]
Registered Member Greetings Akashri , Cavitation can form in any type of fluid transfer centrifugal pump . Cavitation occurs when air, steam, or thermal fluid vapors become entrained in the fluid. Fortunately, cavitation exhibits clear warning signs before it becomes a facility-threatening issue. Some of the symptoms of cavitation include Decreased flow or pressure: When a pump produces lower flow volume or pressures than expected, it may be a result of cavities forming in internal components. Noise:... [ more ]
Registered Member Sure, cavitation can take place in H/C pumps. Regards- Ali M. Al-Shurafa [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
Overhung Fan assemblies Which bearing should be fixed and floating?
RM Registered Member
Registered Member Re: Overhung Fan assemblies Which bearing should be fixed and floating? [ more ]
Registered Member Please note that my email address is NO LONGER rod.bennett@bluescopesteel.com I have mostly retired and my email address is NOW rodjbennett@bigpond.com [ more ]
Registered Member Anantharaman, What you are saying sounds correct. It is normal to fix the bearing handling the higher radial load. Refer Plant Services article http://www.plantservices.com/articles/2008/012/ [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
When should we perform maintenance ?
RM Registered Member
Registered Member Condition monitoring is crucial in the predictive maintenance of machinery. The process involves monitoring specific conditions and parameters of the machine in real-time. This helps in predicting machine failures and unplanned asset breakdowns. However, keep in mind that maintenance should only be performed when emerging faults and can also be identified early on. These emerging faults can be predicted by gathering historical data of the machinery and monitoring the temperature and the... [ more ]
Registered Member Thank you Jim and Shurafa for your comments. This is the real case. [ more ]
Registered Member I tend to agree with Jim. One of the best practices is to review and revise the setpoints based on the plant-specific experience, perhaps every three years or so. The setpoints could go up or down. If failures took place while the reading was below the shutdown setpoint, this is a flag that there is a weakness somewhere. Maybe the period between data collection is too far, maybe the setpoint is too high, maybe the failure mode is not detectable early enough by vibration etc. On the other... [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
Condition Monitoring Systems
RM Registered Member
Registered Member https://sensors.waiteswireless.com/ Contact them for a free demo, in most cases you can try it before you buy it Vibe/Temp/spectrums/waveforms/trends/alarms/analysis abilities/secure/from any web browser Dave [ more ]
Registered Member Condition monitoring is one of the vital tools in the predictive maintenance of assets. Through condition monitoring, maintenance can be easily scheduled, unplanned downtime can be avoided, and emerging faults and can also be identified. By determining when an asset fails, technicians can follow safe work practices. With the help of condition monitoring, the technician can also focus on the correct fault and not waste time checking each part of the asset. If you are planning to implement... [ more ]
Registered Member There are many considerations to take into account before purchasing an online system. I have experience with several manufacturer's and here is what I have learned: 1. These systems require some knowledge of computer networking. You may need a little (or a lot) of help from your IT department to make it work. Especially if the data will leave your local network. 2. The cost of sensors, cables and electrician's time can far outweigh the cost of the core system. Don't forget to take this into... [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
Dual Volts Adapter CSI Model A06290V
RM Registered Member
Registered Member Did you make an adapter yet? Walt [ more ]
Registered Member Just to be clear, I have a 2120-2 analyzer with CSI-626 Volts-Accel. 2-channal adapter. Your analyzer and/or adapter may be different. Pin Assignments per your figure with A & B are input BNC channels: A-Volts on Pin-23 and A-Accel. on Pin-21 B-Volts on Pin-18 and B-Accel. also on Pin-18 Pin-22 is shield and common for both A & B and Volts and Accel. switch setting. These pin-outs were obtained with a digital VOM meter with Ohms-speaker setting. You can check your adapter the same... [ more ]
Registered Member Thanks for the answer Observing the diagram of the DB 25, can you indicate the connection pins using the number of the diagram presented please Att Reginald [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
Portable Vibration analyzers Comparison
RM Registered Member
Registered Member Hello @Registered Member yes it collects routes which can be setup from the software. The trending can be done too in the software. You can contact the distributor directly, if you want you can include my reference (Waqas from UAE). [ more ]
Registered Member Only a vibrations analyzer? Does it collect routes? Can you trend process readings as well as vibration readings? It’s an interesting looking tool. Who sells it in Uk and Ireland? [ more ]
Registered Member Dear Ali, since you are looking for an Analyzer with good options and both cost effective, I suggest that you look apart from the usual brands in the market. There are several options available and these analyzers give you quite useful data with reasonable price.. One of the option is the Analyzer from Crystal Instruments, they have recently launched a new model which is only a Vibration Analyzer CoCo-70X Read more here https://www.crystalinstruments...x-vibration-analyzer They have another... [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
Bearing temperature rise over time
RM Registered Member
Registered Member 85 C = 185 F, if my math is correct. The word "normal" means different things to different people. Normal can mean possible to happen in real world and it not uncommon. If this is what you mean, than this is "normal" in my world. We can discuss the reasons for the increase but my feelings are you want to ask if the increase is acceptable or not. Typically, when I analyze data and it's acceptance, I don't investigate why data is acceptable. I do investigate if the temperature (or other... [ more ]
Registered Member Thanks for replies, We divided Bearings temperature data into Operational period only (steady state) and saw that temperature of all bearings is gradually rising over 3 year period (from start till now). For example from 68 to 85 (for active thrust bearing). Comparing to the neighbor pump we see the same trend, however the temperature less for 3-4 degree. We assume this is because there is more frequent top up in the lube tank. So, is this normal behavior for bearings temperature over time? [ more ]
Registered Member Your question is much too general. It is reasonable to expect bearing temperatures to rise over time. I assume you are talking about from start to fully operational? The real question is to what maximum level? Is it different than what you have measured before? or compared to a similar pump? What does your pump manufacturer say? If "over time" you mean at NOP/NOT over months of operation, then you might, as suggested, consider too much lubricant being added. Once you answer those questions... [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
performance monitoring standard code
RM Registered Member
Registered Member dear sir we have some critical machines like gas turbine , multi stage centrifugal pump, centrifugal compressor,reciprocating comp at gas refinery .we are interesting to doing performance monitoring during operation ,so i am looking for practical requirements and specification for those best regards [ more ]
Registered Member Is the machine in question a power plant? If so you can trend something as simple heat rate or break it down to individual components or subsets. More info required. [ more ]
Registered Member dear guy no i mean performance condition monitoring doing beside other condition monitoring Technics like vibration and oil analysis . [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
Surveillance Test on Condition Monitoring
RM Registered Member
Registered Member You might like to explore books which talks about IoT for maintenance management the name of book is "Handbook of Condition Monitoring: Techniques and Methodology" [ more ]
Registered Member No It doesn’t tell you enough [ more ]
Registered Member life-data analysis in method of weibull analysis, the data come from CMMS e.g. TTF, failure mode etc. [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
Storage of turbomachinery spare rotors
RM Registered Member
Registered Member if you want refurbish and dynamic balancing at 2.5 grade? we can do [ more ]
Registered Member Hi Guys, I need the OEM manual about conservation procedure for rotors [ more ]
Registered Member What JohnPA said is that you don't have to rotate turbomachinery rotors which are stored horizontally because any sagging can be "relaxed" by slow rolling during the initial start up process. Is my understanding about his statement is right? [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
High vibration
RM Registered Member
Registered Member fan side its possible to remove and take reading whether its smooth means, fan to be dynamic balancing at 2.5 Grade on shop floor machine [ more ]
Registered Member Is the fan impeller mounted directly onto gear out shaft? [ more ]
Registered Member Dear Sir , yes it is 2X of Gear O.P shaft but what about the Fan readings , is not there provision to take Fan readings , i think fan directly mounted on out put shaft . 1. 4H to 4 V phase difference is 90 indicates Balancing problem . But 2. 1A to 2A ,2H to 2V and 4A to 3A Phase difference is nearly 180 indicates misalignment . as per the data i would suggest first to check & correct Machine train alignment then after you could check & Correct Fan balancing .If you have complete... [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
How to find exact source of Rotor imbalance in centrifugal blowers?
RM Registered Member
Registered Member If the problem is repeatable start to start, why not just balance it? I've seen a number of people search for the right spot to balance - if that is part of your question. However, the place to balance is anywhere that is accessible (including safe to place a weight) and for which the rotor responds. [ more ]
Registered Member if you prepare data like above then it is possible to pin point the source of unbalance ie phase reading and vibration data [ more ]
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Asset Condition ManagementPosts About Asset Condition Management
Signal Processing in Matlab
RM Registered Member
Registered Member Here is a good search link for vibration analysis with Matlab: https://www.bing.com/search?q=...4EE1B2A2E932654805A7 Walt [ more ]
Registered Member I would agree with the comments from Walt about the expected type of bearing used for classic small motors. So analysts monitoring these machines do not really need deep details about orbit and other plots associated with fluid film bearings. Nevertheless, a very good reference for fluid film bearings is Orbit magazine that is issued by Bently Nevada (GE). The archived articles are free to download and very helpful as many of them explain the theory in a simple language but with industrial... [ more ]
Registered Member Thanks Walt. I won't get anymore information until I get there as its in a different country and run through my uni, so all I can do at the moment is practice and gain general info. You wouldn't happen to know where I could find some journal bearing proximity probe data to practice the shaft position, orbit plots, spectrum and waveform with would you? Thanks Matt [ more ]
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