Asset Condition ManagementPosts About vibration/alignment/balance

Does anyone have the formula for converting FPM (foot per minute) to RPM?

Thank you in advance.

Registered Member It's almost like I was waiting for someone to ask that. [ more ]

Registered Member Oh no...what have I done! <g> Patrick, I like the bearing geometry calculator and some of the FFT calculations too. Some vendors may not appreciate me providing an easy way to calculate just how long that 100,000 line FFT at 100 Hz is going to take! No promises on when....but I'll keep the good ideas in mind. Jon Spintelligent Labs [ more ]

Registered Member How major of a revision? I like the new look. Do you want to tackle bearing frequencies? At least from the geometric side (x diameter, y number of rolling elements, etc.)? Or CSI's bearing info is easily eported to a text file. How about resolution, LOR, Fmax, time to collect z number of revs. Or converting the AFBMA bearing numbers to SKF numbers? You know, in your spare time. [ more ]

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Asset Condition ManagementPosts About Motor Testing

What causes a motor to draw higher than normal amps

Registered Member 6/4/156:03 PM

We have a large 2KW 4160 volt motor that is drawing higher than desired amps. It run straight across the line with no soft starts or variable speed system involved. It occasionally sets the digital protective relay into countdown mode because of varying load. This motor is on a circulating water system in a power plant. There are 3 motors and pumps that should run in parallel. Because this motor draws too high of amps we can only run 2 motors/pumps at a time. We have pulled the pump and trimmed the impeller to reduce pumping capacity to lower the amp draw but it did not change the amp draw at all. The talk now is to swap motor "A" for motor "C" and see if the amp problem follows the motor or stay with the pump.

I can find no reference anywhere that describes a failure mode or problem that causes a motor to draw higher amps. What do you guys have to say?

Registered Member ❤️

Registered Member I agree with Ron, the amps should have decreased if you trimmed and impeller. Pumps operating in parallel MUST have the same sized impellers, the pump with the smallest impeller can not overcome the discharge pressure of the other pumps and thus cavitates. A pump can draw the same amps if the impeller is trimmed....due to the impeller was too big to begin with and trimming it brings it back onto the pump curve? Had a customer once with a 2300HP 300 rpm pump have flow issues due to sediment... [ more ]

Registered Member MikeC, It looks like the best evidence you could provide might be a diagram of the piping arrangement. Can't agree more with EPete. Turning down a pump impeller and NOT seeing a decrease in current draw really says the pump is not causing the current draw in the first place. It really doesn't make much sense. There should have been a drop. Ron [ more ]

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Asset Condition ManagementPosts About vibration/alignment/balance

Machine age vs vibration level

Registered Member 8/8/212:18 AM

Hello all,

In a typical life of 25-30 yrs of machines, there will be natural degradation. For example, a 2 yr old pump will be quite as compared with 10 yr! Now how to obtain acceptable levels for machines of different age groups ?

Registered Member A bathtub curve graphically relates three types of failure: early, random (constant failure), and wear out . Manufacturing and material defects typically result in early, rapid failure of objects: that region of a bathtub curve is called infant mortality. new machine also can fail as above infant failures. So age /vs how the machine is operated with respect to its design /vs maintainability of the machine FFT Spectrum gives you instant healthiness of the machine so no need to trend the... [ more ]

Registered Member Your results may vary! If a pump is built with proper parts balanced and has the correct shaft clearances and runout it may exhibit lower vibration levels than it the new baseline. I was just involved in a pump that was rebuilt 4 months ago. It was installed without motor shims. When the coupling failed four months later, it was found to be over .080 high. The alignment was corrected and the levels were down but not as far as I would have expected. The gross misalignment had taken it's toll... [ more ]

Registered Member But in our case Malcolm, age is getting to be more of a factor, especially when we consider buying green bananas. Best regards, JGW (BN-MDS 100% retired) [ more ]

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Asset Condition ManagementPosts About vibration/alignment/balance

Beating phenomenum at Conveyor Drive System with Hydraulic Coupling

Registered Member 3/10/173:22 PM

Hello everyone,

I will explain briefly the problem we have in our conveyor drive system.

This is a 800 HP motor driving a gearbox trough a Voith hydraulic coupling.

Vibration goes from 8 mm/s (3000T/H) to 11 mm/s (no load) at vertical direction.

Spectra shows two peaks, one at coupling input speed and other at its output speed. Diference frequency (SLIP) between them is very small from 5 (no load) to 13 CPM (3000 T/H) considering that it should be like 35 or 40 CPM so beating phenomenum would not be present.

Precision alignment has already been done.

I could say that slip is so small because the coupling is oversized, we have other conveyor drive systems where slip is correct (30-40 CPM) and there is no beating.

How could I confirm this with other surveys or tests?

Thanks for reading and sharing your experience

PD:Attached you will find a detail drawing

View Attachments

Registered Member check for soft foot issue at motor though u had said precisely aligned coupling.u should check the soft foot both dynamic condition as well as static condition. [ more ]

Registered Member As using Voith coupling, it is easy to determine the suitable hydro coupling specs for the machine. You just need input speed & motor kW (Power) & refer to the table provided in their website. I also experiencing same experience as you, high vibration for conveyor drive system & spectrum shows peak at 1X RS. I am not concern about the beating in the spectrum. For my case, the problem is only unbalance issue cause from the hydro coupling itself (eccentric I guess). I am using... [ more ]

Registered Member You can see in this attached picture that there is actually beating in CV029 with 3000 T/H (50% of design load) Vibration spectra seems like amplitude modulation with 4000 T/H because two frequencies are getting far away from each other. Greetings [ more ]

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Reliability Engineering for MaintenancePosts about Reliability Engineering for Maintenance

High Amperage problem with centrifugal pump motors

Registered Member 5/11/059:58 AM

Can some one guide us in carrying out the investigation for resolving the high amperage problem for some of our newly installed centrifugal pumps? Presently some of the pumps are operating in parallel to avoid tripping due to overload on motors. Will highly appreciate suggestions......

Registered Member The ARVs (Automatic Recirculation valves) for four of the parallel running pumps were observed passing, causing high capacity flow across the pumps. Therefore leading to high amperage problem. We are presently investigating the reason for the cause of ARV problem. Thanks for all of you sharing your ideas. Looking forward for more suggestions... Good day.... Mohammad [ more ]

Registered Member Is the motor correctly connected in star/delta? [ more ]

Registered Member Makes sense, running two pumps in parallel will increase the back pressure since this is a function of the flow. Try throtling a valve (not gate or block) in the discharge, probably you have a control valve somewhere? [ more ]

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Asset Condition ManagementPosts About Asset Condition Management

TREVI TESTING for RELIEF VALVES

Registered Member 1/29/1011:47 PM

Hi Gents

Can i have some informations about the online testing for the safety relief valves, they call it trevi testing, and what are the advantages and disadvantages in this test?
Please shear your Knowledge’s and if there any vendors near by our regon..(gulf)
thanks and regards

Registered Member Thread lifted 1) Pre test defines whether or not the PSV is in such a condition it works or not. This can help give you a good historical view of the valve. i.e Is it neccesary to remove the valve every year if the valves operates and by the eye seems to be fine ? 2) Online testing has a economical advantage. I do not prefer the Trevi test equipment. I prefer the ventil preventtest or metrus Teson designed EQ for this purposes. They are more accurate and the tests are automated. Our company... [ more ]

Registered Member I have 2 clarification questions: 1) Do we really need to do the pre-overhual test and for what purposes? 2) Under what circumstances or purposes do we need to do online testing for PSVs such as Trevi test? [ more ]

Registered Member Irshad, Without going into the acceptability or otherwise of on-line testing for non-steam applications, I hope you agree that on-line testing cannot manage some of the failures modes in any safety valve. We use the term 'coverage factor' to describe the proportion of failure modes to the total managed by a given test procedure. On-line testing can never have a coverage factor of 100%. With due respect to what EPRI or other learned bodies say, there is no reason to ban on-line testing of... [ more ]

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Welcome to AMPBook and Article Discussions

Cách làm thầu bóng đá cho mùa euro 2020 kiếm trăm triệu

Registered Member 4/8/2110:34 PM

Cách làm thầu bóng đá cho mùa euro 2020 kiếm trăm triệu

Cách làm thầu bóng đá cho mùa euro 2020 kiếm tiền dành cho đàn ông em mê say bóng đá. Bữa nay mình sẽ hướng dẫn làm thầu đá banh một cách thuần tuý nhất. Trong khoảng người lao động cho đến người to tuổi cũng có thể làm thầu được.

Thầu bóng đá, thầu banh ấp ủ banh là gì ?

Nghề thầu banh, bóng đá trực tuyến là hình thức đứng ra làm trung gian nhận và ghi kèo banh cho người chơi. Trong khoảng ấy ăn được tiền chênh lệch đặt cược trong khoảng người chơi và nhà cái. Đó còn gọi là tiền “lai”. Nghề này đã xuất hiện từ lâu cho cho tới hiện tại nó vẫn còn rất hot. Bạn đang thất nghiệp hay công việc không ổn định. Đồng lương bèo bọt, hay muốn kiếm một khoảng tiền để làm 1 Dự án nào đấy. Có thể chọn nghề thầu banh này để có tiền tiến hành những điều các bạn mong đợi.

Điều kiện để làm thầu banh, thầu bóng đá trực tuyến như thế nào?

Thứ 1 bạn phải hiểu rõ các kèo bóng đá để nhân tiện việc ghi nhận kèo từ khách hàng của bạn. Như các kèo chấp, kèo tài xỉu, kèo góc, kèo thẻ vàng, kèo tỷ số bàn thắng, kèo trên, kèo dưới. Thứ 2 hiểu rõ về các đội bóng, cách đặt cược trên trang cá độ bóng đá. Thư 3 các bạn phải có một số lượng quý khách một mực tầm 5-10 người hoặc đa dạng hơn. Bạn cần hiểu rõ khách hàng của các bạn rằng khi báo kèo cho bạn. Vì khi thua độ họ có khả năng chi thanh toán cho các bạn ko.

TIP làm thầu banh, bóng đá trực tuyến kiếm lời hơn trăm triệu qua mua euro 2020.

Hình thức để kiếm lãi ” thơm bơ” trong nghề này là làm kèo “hot”. Đấy là lúc cuộc đấu đang diễn ra hay đá live. Người chơi gọi nhắn tin hoặc gọi điện thoại đến hỏi giá hiện tại để bắt kèo rung, kèo trận… Ví dụ:

Trận bóng đá húi Pháp giữa 2 đội PSG và Dijon đá khi 01:30 ngày 02-23 bữa nay.

nhà cái cá cược bóng đá đưa ra tỷ lệ kèo chấp cho cửa trên là 1.5 trái cửa trên ăn 0.95, cửa dưới ăn 0.97. Chọn cửa trên ăn 0.95 với 10 triệu ví như thắng thua về 19 triệu 500 ngàn. Chọn cửa dưới ăn 0.97 với 10 triệu giả dụ thắng thua về 19 triệu 700 nghìn.

lúc người chơi gọi điện hay hỏi giá kèo hiện tại. Chúng ta có thể báo mức giá ăn ở kèo trên và dưới thấp hơn mức nhà cái đưa ra. Giả tỉ chúng ta giảm mức giá ăn kèo trên xuống 0.91, kèo dưới xuống 0.93. Thì chúng ta đã lãi hơn 400 nghìn rồi ví như khách hàng đặt cược 10 triệu.

Nghề thầu thầu banh hay bóng đá này nếu như bạn có số lượng quý khách đặt kèo trong khoảng 100 đến 200 triệu. Bạn đã thu về hơn 4 đến 8 triệu đồng. Lúc những cuộc đấu đang diễn ra live, phổ thông con bạc hay gọi điện báo tin nhắn đánh kèo tài xỉu trực tiếp (rungning) hay kèo rung. Các bạn có thể lợi dụng giảm giá trong khoảng 5-8 giá thành ăn. Bạn sẽ thu về 1 khoảng kha hơi tiền lai rồi. Chưa tính tiền hoàn trả 0.6% của nhà cái dành cho mỗi đơn cược.Tổng tiền cược các bạn đặt cược hợp thức sẽ hoàn trả 0.6%. Tổng cược hôm nay của các bạn lên tới 100 triệu bạn nhận được 600 ngàn. Bạn cũng ko cần quan tâm quý khách của mình thắng hay thua trong mùa euro 2020.

Nên chọn lọc trang web cá cược trực tuyến nào để làm thầu bóng đá, thầu banh mùa euro 2020 ?

Điều Đầu tiên bạn cần tuyển lựa nhà cái uy tín đảm bảo việc rút nạp tiền.
Trang cá cược của các bạn phải có giá tiền ăn cao hơn những trang khác.

Với kinh nghiệm cá cược bóng đá lâu năm thì xin chia shre cho anh em 1 trang web cá cược bóng đá uy tín. Anh em có thể tham khảo ấy là ku368.net. Trang web này anh em có thể sử dụng để làm thầu banh, thầu bóng đá lô đề. Tỷ lệ kèo trang này ăn cao hơn những trang khác. Tỷ lệ hoàn trả tiền cược cao. Giao diện dễ nhìn dễ thao tác. Rút nạp tiền chóng vánh trong 1 nốt nhạc. Tôi đã từng lấy trang này vào mùa Wolrd Cup 2018. Cả mùa Wolrd Cup tôi chỉ cần ghi nhận đơn của của quý khách. Thu nhập hơn trăm triệu chỉ với 5-15 khách hàng tiềm năng.

vì sao ko tuyển lựa những trang b88, sobet để làm thầu banh, thầu bóng đá? Những trang này hoàn toàn là trang trả sau nên có tỉ lệ ăn thấp Chính vì thế ảnh hưởng đến việc ăn lai. Trang này thường ít loại thể kèo để khách hàng muốn đặt cược. Tỷ lệ kèo ăn biến động chóng vánh. Lúc đặt cược các trận chiến diễn ra luôn bị ngậm kèo lâu rồi bị chối từ đơn cược. Chắc hẳn điều ấy ko người nào muốn xảy ra nhỉ. Còn có rất nhiều kinh nghiệm trong nghề làm thầu banh muốn chia sẽ cho anh em. Anh em có thể chia sẽ góp ý phản hồi xin gửi về zalo philipines +63 9270098667

Asset Condition ManagementPosts About Lubrication and Oil Analysis

Greasing shielded bearings ????

Registered Member 2/23/055:59 PM

I was recently surprised to learn that some double shielded bearings are supposed to be greased in a same way as open ones. The grease, they say, moves through a micro perforation between the shield and the inner race.

I have serious doubts that this is a normal procedure and wonder how the old grease gets expelled during the purge if any.

Thanks,
David

Registered Member Lee, In answer to your question about sealed and shielded bearings. Sealed bearings typically have rubber seals on each side. These seals make rubbing contact with the inner race, there is no gap. Everyone agrees that these can't be relubricated. They are normally only specified for harsh environments because the rubbing contact of the seals actually shortens bearing life, so they will not last as long as a shielded or open bearing in a good environment. Shielded bearings have metal or hard... [ more ]

Registered Member David We have three deep well effluent pumps in which we replaced the upper plain bearing for a flanged SKF bearing. The bearing is 2RS however the housing has a grease nipple fitted to which we fit a 6mm tube with a nipple at the assembly top plate. The path of the grease is into the bearing and out through the rubber seals. I understand how greasing outside of 2RS bearings would not allow grease into the bearing. In our case the force of the grease slightly distorts the seal but we know... [ more ]

Registered Member Some info you may already be aware of: - AFBMA number is provided on the nameplate of motors. - AFBMA Suffix PP stands for double shielded (i.e. 65BC03 JPP3) and suffix EE stands for double-sealed (i.e. 65BC03 JEE3) - Manufacturer p/n's often identify seal or shield. For SKF it is ZZ for double-shielded and 2RS1 for double sealed. All of the shields I have seen are metal. Seals by their nature require a rubbing contact so they will usually be at least partially rubber. [ more ]

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Asset Condition ManagementPosts About vibration/alignment/balance

Shaft Runout Tolerances

Registered Member 8/28/083:58 PM

I was wondering if anyone here may have a link to where I can find a spread sheet, or tables, on shaft run out tolerances. This would be for mostly over hung fan shafts, up to 5 inches in diameter...I have one here I need to check on.

Thanks

Registered Member Dear, I also have a case about the runout check on a long shaft of vertical multi-stage centrifugal pump ( 4m length and 40mm shaft diameter for the area of impeller fit). This pump never was put in service before. Recently due to other issue found on other sites, we disassembled this pump to do a comprehensive inspection , meanwhile, found the runout is out of tolerance ( max. TIR found at shaft end is 0.18mm, where is for 1st stage impeller fit. ) Although I know that for this kind of pump... [ more ]

Registered Member http://www.easa.com/sites/file...R100-2010_1010-1.pdf page 6 http://www.roll-kraft.com/site...nspection-guidelines http://www.flowserve.com/files...t_fis159_slm6200.pdf page 3 Here are a few resources that show same tolerances as what has been posted Dave [ more ]

Registered Member Is 0.5mm coupling hub run out is acceptable for soft coupling? As per my knowledge the hub run outs should be less than 0.05mm. What is allowable run out for pump coupling hubs? [ more ]

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Reliability Engineering for MaintenancePosts about Capital Projects

Bearing Conversion Charts - AFBMA to SKF

Registered Member 12/29/055:38 AM

I have seen this chart somewhere on this forum but I could not convert AFBMA number completely to SKF number.
I want to convert AFBMA Number 50BC03JP30X28 to equivalent SKF number.From the chart I referred, last two digit numbers could not be converted.
Can someone help.

Registered Member Dear Ahmed, Thanks for your support. Could you please send your E mail address on alpeshp@essar.com [ more ]

Registered Member Hello All, SKF offer a conversion guide at http://www.skf.com and http://www.aptitudexchange.com If any of you need to convert bearing designations to SKF, I will gladly have them converted for you just e-mail me your lists for conversion. [ more ]

Registered Member A tool that would be handy for you is the Bearing Expert program which contains over 1 Million Bearings. Can cross reference by part number, dimensions, bearing type, manufacturer and AFBMA number. Also contains over 200,000 bearings fault frequencies. http://www.reliabilitydirect.com/vibrationmeterproducts/vibfrequency.htm [ more ]

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Reliability Engineering for MaintenancePosts about Reliability Engineering for Maintenance

Calculating Plant Availability

Registered Member 9/6/082:52 PM

Gentlemen.

There seem to a a tendency by reliablity and maintenance practitioners to overstate the actual availablity of plant we run.

When we try to reconsile the plant availability with actual throughput there is a big discrepancy that can not be explained by merely accusing production or operations of inefficiency.

How can we calculate plant availability in such a way that we can relate the throughput achieved by de-rating plant availabilty by some reasonable co-efficient [typically in the 90 percentile] to come up with actual production throughput.

Ecky

Registered Member From my days in power generation, maybe these basic availability statistics would be helpful. Over a given period for a generating unit: Availability Factor = ratio of time on line to total time in the period. Capacity Factor = ratio of actual output to output that a unit can achieve at rated capacity (sometimes called maximum dependable capacity). Available Capacity Factor = output that could have been achieved, if desired/required, to the output that a unit can achieve at rated capacity. [ more ]

Registered Member The difference between the two might be called equipment availability vs. system availability. Could it not depend at which level you are measuring? [ more ]

Registered Member Ecky, You say: Why so? The definition of availability is just that; that the item is ready for use if required or it is already in use. I don't see the need to redefine availability because of a problem that you believe exists. Such a move would not help you with your original problem either, since you still have to account for slowdowns as well as quality related issues. In my view it is better to get a clear picture if what each term means and use the right one for your purpose. There are... [ more ]

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Asset Condition ManagementPosts About vibration/alignment/balance

The sawtooth vibration behavior occurs after steam turbine running up to normal speed

Registered Member 8/13/2110:21 AM

Hello Dear All,

Do you have this similar experience to the above subjected issue? Thanks.

Background:

1. For every time of steam turbne (condensing) startup, the sawtooth type vibration fluctuation will be happening after the speed reaches close to operating speed, and after a certain time ( around 20 minutes) the vibration will be suddenly stable.

2. Based on the trends of steam turbine operating parameters:

- no obvious evidence indicates the vibration is related to hot start or cold start.

- no obvious evidence indicates the vibration is related to delta T between upper casing and lower casing.

- no obvious evidence indicates the vibration is related to exhaust pressure

3. During the vibration fluctuation the vibration phase is varying in a small range,but 1x always is dominant. -----It looks like small rubbing is happening and resulting in thermal unbalance （morton effect).

My question is which will result in this phenomenon and the vibration suddenly becomes stable after around 20 minutes.

View Attachments

Registered Member I have attached Exhaust Temperature & Inlet Steam Flow Curve of a Single Stage (Curtis) Back Pressure Steam Turbine where effect of Governor Valve movement on Exhaust Temperature is more evident. [ more ]

Registered Member Hello lux You have mentioned no obvious relation with Differential Temperature b/w Upper & Lower Casing and also you have mentioned Casing Temperatures of 400-410 Deg Celsius. May I ask how Casing Temperature is measured ? You have mentioned current behavior is not related to Process Loading. May I ask if the Turbine Inlet Steam Flow remains constant from the time Vibration fluctuation starts till the time it is vanished ? During Startup Temperature within Steam Turbine changes sharply... [ more ]

Registered Member Hello Dear All- Thanks for your kind comments above. For the casing expansion----Actually this was measured duirng the commissioning (at the beginning of this year), didnot find an uneven expansion from the readings of several dail gauges at that time. Also as I mentioned above, the vibration behavior is not related to starting mode. Even for hot start ( Time interval between shutdown and restartup is less than 1 hour), the temperature of casing compared to normal operting basically was same... [ more ]

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Asset Condition ManagementPosts About Motor Testing

Megger Test Fails to Detect Winding Failure

Registered Member 10/7/087:29 AM

I just had a 3-phase 415V motor tripping instantaneously on start-up. This is an 11kW motor. I did a megger test phase-to-phase, phase-to-earth of the motor and cables separately. The readings were very good,some even more than 1G-Ohm. I also measured the winding resistance and were all balanced.

However, when I dismantle the motor I found some burnt marks at the end windings and some broken strands. I'm surprised this did not show up in either the megger or resistance measurements.

Was wondering if anyone could shed some light on this? And what conditions where a failed winding would not show its face in a megger test.

Registered Member (Posted on December 8, 2008 @ 11:13 PM) I said I would post the results of the capacitance measurement on the motor after the rewind is complete. So here are the numbers: 1) Measured with Fluke 87 multimeter: 12430 pF per phase 2) Measured with a megger @ 1000 Volts: 11900 pF per phase 3) Measured with a megger @ 5000 Volts: 12300 pF per phase It can be seen that the capacitance to ground is a true constant unlike the inductance of the winding that varies over several hundred percent. In the... [ more ]

Registered Member It is a fact that experimentation is rarely seen on this board. I think it is fair to say that the working paper posted by quoted author on October28, 2008 at 8:29 failed completely from theoretical point of view. There was not one single result correct. The second paper, posted on December 9, 2008 at 01:11 AM, contained both the theoretical part and the practical experiments. So let’s have a look, for a change, on the practical results. I would really recommend reading this paper, because... [ more ]

Registered Member Thanks TestTech, I'm glad that you appreciated my contribution. Looking at the thread, I can see why you used the term battlefield, although I didn't intend to contribute to that type of environment. My goal was to get to the bottom of the question and also try to make the conclusion obvious to others, although sometimes I get sidetracked and sometimes I make simple things sound more complicated then they really are. I'm glad you were able to sort through all that to find the right... [ more ]

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Asset Condition ManagementPosts About vibration/alignment/balance

Difference betwen a velometer and an accelerometer

Registered Member 2/1/088:39 PM

Hello everyone!
What are the differences between a velometer and an accelerometer? is the accuracy of one greater than the other? and how does the velometer acquire its readings ?
Thanks all

Registered Member If you go to the nitty gritty lo signal you should look at HOW more output is produced. Piezo material produce noise, if you just make higher amplification and not higher raw signal you also amplify the noise. Moving coil velocity probes are better to amplify as the noise produced in the sensor is much smaller. To get 1V/mm/s is no problem with very good long term results. Olov [ more ]

Registered Member I was simply comparing the values of an acceleration or a velocity signal. I was attempting to point out that in the lower frequency ranges, for a given vibration, you have "more" velocity signal than acceleration. As many of us have studied in classes, acceleration tends to attenuate lower frequencies and accent higher frequencies, displacement is opposite, and velocity is more even across a wide band. This means that at lower frequencies, you are trying to measure a naturally smaller... [ more ]

Registered Member Michael, you mentionned signal to noise ratio in your latest comment. What would be an acceptable range for a monitoring system for the full scale we want to monitor. For example, if we need to check from 0 to 10mm/sec peak, is it OK to have a signal from 0 to 10mVolt? What is typical? Thank you. Charles Auger [ more ]

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Asset Condition ManagementPosts About vibration/alignment/balance

Inboard - Outboard ??

Registered Member 10/5/059:33 AM

I have been involved in maintenance for over 25 years and am amazed at how the terms "inboard" and "outboard" are perceived. I have never seen any technical literature or information that globally standardizes these terms either. For all of us who speak the maintenance language, inboard and outboard is spoken quite frequently. Being an "old school maintenance mechanic" my perception of inboard and outboard was directly related to the drive coupling. The terms "drive end" and "non-drive end" are more to the point but not as accepted as inboard and outboard. It gets more confusing when assigning inboard and outboard to gearbox intermediate shaft bearings. Most recently, I was discussing a vibration problem with maintenance on an overhung fan "outboard bearing". I was referring to the non-drive end bearing however, maintenance perceives inboard and outboard to the fan rotor and not the drive coupling. For sake of discussion, what is the bearing on a gearbox output shaft side – inboard or outboard, drive end or non-drive end?

Registered Member Then on verticals: what do you use? Using numbers; Mtr top brg = 11 or 1H or ?...? On Horz I use: Mtr ODE Horz = AH On Vert I use: Mtr top in-line w/flow = A1 I've found this combination of a & n to work quite well allbeit not he only system that works and works well. In addition I post engineering files available for all that have photos of all equipment along with the machine sketches and point ID's as well as some of the reports containing such info and block sketches. But for the... [ more ]

Registered Member We ask 5 of our men which bearing they considered to be the inbd, and otbd, and all were confused. This was on an overhung fan, so this is why we adopted the number method. Much easier to understand. Rod [ more ]

Registered Member I think you just have to say inboard and outboard to what - I have always used the drive exchange. So a jackshaft bearing can be both inboard the the motor and outboard to the fan. [ more ]

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Asset Condition ManagementPosts About Motor Testing

Number of Rotor Bars and Stator Slots!!

Registered Member 3/23/086:39 AM

Hi guys,

Is there any formula/technique(other than counting

)for calculating the number of Rotor Bars and Stator Slots of an AC Induction Motor?What are the design parameters they will consider in calculating the same?

Please forgive me if it is an old wine in a new bottle!!

Have a nice day!!

Registered Member Hello Experts, Can someone point me to a resource from where i can know the Number of Rotor Bars and Stator slots ? Of course ABB does not wanna give it. TIA, VinMan [ more ]

Registered Member Hello, You have discussed using the vibration spectrum to identify the rotor bar number but could you use the current spectrum to do estimate the rotor bar number? Also, Aditya, please can you explain how once you know the number of rotor bars it is easy to estimate the number of stator slots? Thanks! [ more ]

Registered Member You're welcome. I should clarify, the last paragraph of my last post referred to rotor slots. THMotorMan's post applied to stator slots. [ more ]

See all 9 replies...

Asset Condition ManagementPosts About vibration/alignment/balance

Key length calculator?

Registered Member 4/24/0512:44 PM

When considering unbalance in a keyed shaft application, how does everybody calculate what length key stock they need to install to keep things in balance? We have run into some apparent problems in the past with unbalance, and we traced it back to improper length key. We have a lot of high speed fans, that are all belted "speed up" configurations. All of our fan shafts are custom made, with key slots that vary in length. For instance, on a 3" shaft, some key slots are 4" in length while other shafts of the same size have a key slot 7" in length (don't ask why). So how does one go about calculating the proper length key for any given application?

In our situation, here's what happened. We switched speeds of some of our fans, and that required a smaller driven sheave, that in turn required a different taper lock bushing, which in turn used a 3/4 height (rectangular) key as compared to the full (square) key that we had been using. Conveniently enough, the new bushings came with a 3/4 key that was the exact length of the bushing. So the mechanics, without questioning, installed the new sheaves and bushings with the provided key. This left about 4-1/2" of unused key slot in the shaft (a void about 1/2" x 3/4" x 4-1/2"). These fan shafts turn 2350 RPM. Now all hell breaks loose because things are very much out of balance.

When we first discovered we had this problem, we decided to base our calculation for a proper length key on a "one for one" total volume of the key slots vs. key stock. In other words, if we had a square (full) key, and the shaft had a 4" slot and the corresponding bushing had a 2" slot, we made the key 3" long. This is obviously not the best way to do it, because the excess key stock length (to offset the unused shaft key slot) is at a further distance from the center of rotation of the shaft. However, this was a quick logical shot in the dark to get us close, and made things much better, but not perfect. Since then, I have had some time and I've been trying to find an exact formula. I have yet to come up with such a formula, so for now I've added a correction factor to offset the "overshot" in our first formula. I don't know if we're doing it right, but here's how I do it now: (shaft slot length * shaft slot depth * key stock width) + (bushing slot length * bushing slot height * key stock width) / (key stock width * key stock height). The answer ends up being the length (inches) of the key stock that would equal the volume of the shaft key slot + the volume of the bushing key slot. I then take 95% of that number and use that as correct key length. (The 95% was an average (91%-98%) of all the different key combinations and shaft sizes and speeds that we see).

So far this seems to work out real good, but I know it's still not perfect. What does everybody think, am I splitting hairs to get it any more precise then that? Is there some kind of formula already out there that I don't know about?

Registered Member Wonder if I put a disclaimer in there before uploading that years ago... Gald it's getting some extra mileage. [ more ]

Registered Member Length x width x thickness x 128.8 will give you your key weight in grams. We use this formula to find the half key weight when balancing rotors. I would think it would work to find the amount of key needed to fill a keyway. [ more ]

Registered Member Here are the results for cutting the simple key, which is half the exposed keyway, the full key and the stepped key. [ more ]

See all 21 replies...

Welcome to AMPBook and Article Discussions

Cá cược Liên Minh Huyền Thoại là gì? Ở đâu uy tín?

Registered Member 3/22/213:01 AM

Cá cược Liên Minh Huyền Thoại là gì? Ở đâu uy tín?

Cá cược Liên Minh Huyền Thoại là gì? Nên cá cược LMHT ở đâu uy tín? Đây là những thắc mắc được không ít người tìm kiếm chỉ cần khoảng vừa qua. Nhắc từ khi hình thức cá cược esports trở thành phổ quát tại thị trường Việt Nam, thì số lượng người chơi cá cược LOL đã cải thiện lên không ít.

Trong bài viết bữa nay, JBO sẽ tư vấn đầy đủ những thông tin liên quan tới việc cá cược liên minh huyền thoại. Đồng thời giới thiệu cho các bạn Top 5 nhà cái cá cược lol uy tín để các bạn tham gia cá cược LMHT trực tuyến.

Game Liên Minh Huyền Thoại là gì?

Liên Minh Huyền Thoại là tên gọi của một tựa game đối kháng rất nức tiếng, do đơn vị Riot phát hành vào năm 2009. Trò chơi này có tên gọi đa số là League of Legends (viết tắt là LOL).

kể diễn ra từ ra mắt thì rộng rãi người nghĩ rằng loại thể game LMHT sẽ chẳng thể nào sánh bằng game Dota 2, tuy thế thời kì đã chứng minh hầu hết.

Tính cho tới hiện tại cũng đã hơn chục năm phát triển, game Liên Minh Huyền Thoại đã được rất nhiều game thủ trên thế giới ưa thích và bình chọn là một trong những loại game đối kháng chiến thuật hay nhất hiện nay.

Những game đòi hỏi tư duy chiến thuật luôn nhận được sự ủng hộ và tham dự của cực nhiều người chơi. Bởi ngoài tính tiêu khiển và người chơi còn được rèn luyện khả năng tư duy, phản xạ và khả năng Nhìn vào không ít.

đa dạng người chơi cảm nhận được sự khác biệt lớn sau một thời kì tham gia.

Cá cược Liên Minh Huyền Thoại là gì?

Cá cược Liên Minh Huyền Thoại là một hình thức đặt cược cho thể loại game LMHT, phía nhà cái sẽ lên các kèo cược giữa các đội tuyển với nhau, các bạn phải chọn giải đấu mà bạn muốn chơi, sau ấy xem cặp đầu nào có kèo hợp lý thì đặt tiền cược cho đội tuyển ấy.

Cách cá cược liên minh huyền thoại

bước 1: truy nã cập trang chủ nhà cái

Để tham gia mọi dịch vụ của nhà cái JBO. Bạn cần truy hỏi cập trang chủ nhà cái này hoặc đơn giản mở App JBO ví như bạn đã chuyển vận về điện thoại, máy tính bảng.

Đây là một trong những đại lý khá uy tín của nhà cái JBO tại nước ta. Nên các bạn có thể yên tâm phần nào về những dịch vụ uy tín mà nó đạt được. Kèm theo bạn cũng có thể chọn trang chủ JBO khác, nhưng thường bị chặn hoặc khó truy tìm cập đấy.

thao tác 2: Đăng nhập tài khoản

Để chơi cá cược Liên Minh Huyền Thoại tại JBO. Bạn cần đăng nhập tài khoản (nếu chưa có account bạn sẽ phải “Đăng Ký” và điền gần như các thông tin được nhà cái yêu cầu.

Nhập tài khoản, mật khẩu vào khuông được bắt buộc và nhấn “Đăng Nhập”. Tương tự anh em đã có thể tham dự mọi trò chơi tại nhà cái JBO rồi. Chúng ta cộng chuyển đến thao tác tham gia chơi Liên Minh Huyền Thoại nhé!

bước 3: truy tìm cập LOL và chơi game

Liên Minh Huyền Thoại tại mục “ESPORT”. Các bạn có thể truy hỏi cập ngay mục này để chọn kèo, đặt cược. Với vô thiên lủng cuộc đấu được cập nhật liên tiếp. Hẳn nhiên xem trực tiếp tại trang chủ nhà cái. Đảm bảo anh em sẽ có một chọn lựa giải trí khôn xiết hấp dẫn mỗi ngày.

Nên cá cược Liên Minh Huyền Thoại ở đâu uy tín?

Mình đã từng tham gia cá cược game LMHT tại 1 vài web cá cược liên minh huyền thoại ngay sau đây, đảm bảo rất uy tín.

ví như các bạn chưa biết cá độ liên minh có bị bắt không nên cá cược Liên Minh Huyền Thoại ở đâu an toàn và uy tín thì hãy thử tham khảo một số gợi ý bên dưới này nha:

Cá cược LMHT tại nhà cái JBO

Nơi uy tín hàng đầu chuyên về cá cược Liên Minh Huyền Thoại hiện nay chính là nhà cái JBO. Mình biết tới nhà cái này cũng là duyệt 1 lần trông thấy quảng bá trên các diễn đàn cá cược thế giới.

Cá cược LMHT chính là một trong những mảng cá cược hơi mạnh tại JBO, họ đầu tư rất nhiều vào đây, mọi thứ chừng như rất chuyên nghiệp.

Chuyên trang cá cược LMHT uy tín – Fun88

Cái tên Tiếp đến mà mình muốn mách nhỏ cho mọi người, chính là nhà cái Fun88 – Ông trùm trong ngành nghề cá cược thể thao điện tử. Đặc biệt riêng về các giải thi đấu Liên Minh Huyền Thoại, phía nhà cái Fun88 đã khai triển rất chuyên nghiệp và bài bản, cung cấp đủ các loại kèo cược dành cho người chơi.

lúc tạo xong account tại Fun88 (rất nhanh), các bạn chỉ cần nạp tiền rồi chọn vào game League of legends, rồi chọn tiếp giải đấu và trận đấu mà bạn muốn đặt cược. Dù là người chơi khắt khe cỡ nào thì lúc tới với Fun88, bạn cũng phải mở lòng mà thôi.

Cá cược LOL tại nhà cái 12Bet

Trong TOP các nhà cái chuyên về cá cược game Liên Minh Huyền Thoại thì 12Bet là một cái tên được không ít người chơi đề cập đến hiện nay.

ưu điểm của nhà cái này chủ yếu là cá cược thể thao/bóng đá, tất nhiên mảng Esports cũng mới được nhà cái 12Bet tập kết đầu cơ trong thời gian vừa qua. Mảng nào càng mới thì đương nhiên sẽ được để ý và đầu cơ phổ quát hơn.

Cá cược LOL tại nhà cái Letou

Ngoài 3 cái tên nói trên, thì bạn có thể tham gia cá cược Liên Minh Huyền Thoại tại nhà cái Letou. Đây là một nhà cái rất nổi tiếng tại khu vực châu Âu và châu Á. Thậm chí, Letou còn nằm trong TOP các nhà cái uy tín nhất hiện nay.

Nhận xét: Do Letou là một nhà cái rất uy tín, Do đó mình cũng ko có nhận xét gì phổ thông. Bởi vì lúc trải nghiệm thực tại tại đây, mình mới thấy họ quá chuyên nghiệp, nếu bạn không tin thì có thể thử xem thế nào nha.

Cá cược liên minh huyền thoại tại nhà cái 188Bet

Trang cá cược game Liên Minh Huyền Thoại rút cục mà mình muốn nhắc trong bài viết bữa nay, chính là nhà cái 188Bet.

Đây là một nhà cái rất uy tín trong lĩnh vực cá cược trực tuyến hiện nay. Họ cốt yếu kinh doanh các sản phẩm cá cược bóng đá, live casino, xổ số online,… Thậm chí, nói bắt đầu từ cá cược Esports được đa dạng người để ý, họ cũng đã nhảy đầm vào ngành nghề này và cũng gặt hái được không ít thành công.

Với những thông báo mà mình vừa san sớt, chắc mọi người cũng đã hiểu rõ về cá cược Liên Minh Huyền Thoại là gì và ở đâu uy tín rồi đúng không nào? Chúc bạn chọn được một nhà cái chuyên về cá cược LMHT uy tín nhất nhé.

Hãy để lại lời nhận xét nếu bạn muốn đóng góp thêm quan điểm cho bài viết, bằng cách bình luận trực tiếp ngay dưới này nha. Chúc các bạn một ngày mới thật phổ thông may mắn và nhớ đừng quên cược cho đội tuyển LMHT mà các bạn yêu thích nha.

Asset Condition ManagementPosts About vibration/alignment/balance

Who is a best bearing manufacture in the world?

Registered Member 4/17/086:06 AM

Accroding to your experience which bearing (Brand)have highest service life. What you think who is a best bearing manufacture in the world?

Registered Member As far as radial ball bearings for electric motors or pumps-SKF, FAG, NTN Pillow Block Bearings for Fans: Standard & Medium Duty Ball-_Sealmaster Heavy Duty Ball-Linkbelt or Fafnir (Fafnir doesn't make an expansion) Spherical Roller Bearing--Solid Housing-Dodge Imperial Series Spherical Roller-Split Housing--SKF [ more ]

Registered Member I have no idea what is the right awnser, but for pure quality I tend to trust Japanese companies the most so in bearing that would be NTN and NSK. My bias comes from automobile companies but I don't know if it can be applied to all sectors. With that said, service is very important for me and SKF are always glad to help so it's my go to company. And like others have said, with good maintenance any bearing from a big company will last a very long time. [ more ]

Registered Member Going through the list. I guess Pioneer and Kingsbury will make it top for huge babbitt bearings. [ more ]

See all 14 replies...

Reliability Engineering for MaintenancePosts about Capital Projects

How to set Magnetic Center of the motor

Registered Member 1/13/162:30 PM

We are having one motor for maintenance 3600HP, 6.6KV, 3582RPM. In Solo testing it shows the axial movement of the rotor shaft around 1.3mm back and forth which must be stable in the magnetic center line. We are facing axial vibration 5.5mm/sec and radial around 3mm/sec. The vibration is fluctuating form 1.7 to 3 radial and 2.7 to 5.5 axial. How can we adjust the magnetic center to keep the rotor stable.

Also what is the acceptable unbalance for power source because we are having almost 10% unbalance No load amps value due to unbalance power source. Can it effect the magnetic center and vibration?

Please see attached file.

View Attachments

Registered Member It's not unheard of for 2-pole motors to oscillate axially when uncoupled. Two factors drive this behavior to be more common in 2-pole motors than slower motors: 1 - 2-pole motors tend to have weaker centering force than slower motors due to fewer vent ducts or no vent ducts. 2 - 2-pole motors tend to have stronger air-related forces due to axial fan design. You can often see this by temporarily blocking off air entrance on double-end ventilated motors and looking for change in rotor... [ more ]

See 1 reply...

Asset Condition ManagementPosts About vibration/alignment/balance

High Gravitational Envelope (gE value) in motor bearing

Registered Member 8/16/198:06 AM

It is a 4 pole 2.5 MW motor. The vibration of motor is not very high (some high frequency peaks were observed). In acceleration spectrum , BPFO harmoics are observed , however no change in bearing temperature or current. In spectrum also peaks present at BPFO. The images are attached.

Any suggestions for the problem?

View Attachments

Registered Member I agree with OLI listen to it with a stethoscope. No information on the motor drive train and i see the bearing is an NU type... maybe application related? [ more ]

Registered Member I don't mind making calls on brand new motors, on the contrary. Is it on VFD or VFD close by? It may be slight change in operation position that made a move in to a damaged operating zone or infinite other reasons. Do it sound like a disaster with stethoscope, screw driver or yellow handle analyzer? Call it then, maybe as planned as suitable. There are no worse than having a fail sitting on data indicating that is the case and not reporting, minimum issue a warning report to swap brg if stop... [ more ]

Registered Member You have a pretty raised peaking level on that time wave for some peaks almost 8 g? also that fft is still in Velocity if you press 'A' on the keyboard should show in acceleration. [ more ]

See all 11 replies...

Asset Condition ManagementPosts About vibration/alignment/balance

sleeve bearing scraping and blue-check / dry-roll check: common misconception

Registered Member 12/17/112:38 PM

Many references recommend to do a blue-check or dry-roll check of new sleeve bearings upon installation into an electric motor which determines the need for scraping (to be done only by experienced qualified people). That used to be a little mysterious to me, but I think I have figured it out.

The purpose of scraping new bearings upon installation into a motor is NOT to make them rounder or smoother or to the correct radius (as some people seem to think) .... the bearing manufacturer is perfectly capable of doing that as long as correct specs are used.

The purpose of scraping bearings upon bearing installation into electric motors is to compensate for any misalignment between as-installed position of the shaft/bearing induced by misalignment between the two bearing housings or perhaps gravity sag of shaft. (sleeve bearings are not particularly tolerant of misalignment, especially as ratio of length to clearance increases).

If you have misalignment in the horizontal plane between bearings of horizontal motor, then you may see diagonal pattern. (the angle shows up much more dramatically than you’d think... if you have 3” diameter shaft with for simplicity 3 mils clearance and a horizontal angle misalignement of 3 mils per three inches, then angle you see is NOT 1/1000 which would be invisible.... it is closer to 1:1 since the pattern goes from one side of bearing to the other over the length of the bearing). [I added a new message below with example of this].

If you have misalignment in the vertical plane between bearings of horizontal motor, then the blue-check/dry-roll check pattern will be only on one end of the bearing, and not the other. That is the idea of the 80% contact spec for blue pattern/roll pattern.... it should be at least 80% of the LENGTH of the bearing (NOT the width!)

There seems to be a common mis-conception that 80% means you want 80% contact over the entire bearing (including width). That is just plain silly because the journal has smaller radius than the bearing and digging out the bottom of the bearing to form similar radius of curvature for full width would destroy the ability to form a convergent wedge.

How common is this misconception? See attached excerpt from article “Sleeve Bearings: A Modern Use for an Old Technology” by Richard Nailen (normally very accurate imo), published in Electrical Apparatus magazine, February 2008. On the 2nd page of the pdf, he says

quote:

[Nailen (2nd page of pdf):]
In assembling the bearing, then, the essential step is what’s sometimes called “blueing and scraping.” The make sure the babbit contacts the journal as uniformly as possible throughout the contact angle of Figure 2 calls for a fitting procedure like that given in the accompanying box [Figure 15].

Figure 2 is on the first page of the pdf and shows contact angle extending for 120 degrees centered on bottom of bearing.

The accompanying box [Figure 15] is dead wrong. The “before” of Figure 15a looks like pretty good contact to me. The after Figure 15b is full contact (ouch!). The caption for figure 15b says:

quote:

[Figure 15b caption, 2nd page of pdf]
Final fitting accounts for the difference in radius between the two curved surfaces, leading to the more uniformly distributed contact at (b).”

.

All I can say is ouch.. dead wrong. The difference in radius is a design feature and we don't want to change that.

He goes on to talk about various repair specifications with imprecise terms [I agree], but he never tells us that Figure 15 is dead wrong and in fact the entire context of how he refers to figure 15 and the caption of Figure 15 suggest this is supposed to tell us the correct pattern in Figure b.

I think I have an idea why there misperception that you want 80% or 90% over the entire bearing (rather than just a narrow strip down the center whose length is 80 – 90% for vertical alignment as it should be). When machinists work with FLAT surfaces they use percentage of contact of the ENTIRE AREA as determined by blue check to describe how flat and smooth the surfaces are. Sleeve bearing 80% contact should never be confused with that type of check... it is completely different. The after shown in Figure 15b would kill a bearing.

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Registered Member I believe these date back to the 70's. The first analysis of the stiffness properties is more recent. I don't remember your application. Some have been used on exciters. [ more ]

Registered Member Sorry, I missed the "socket" part. We have nothing like that. I take it you have had good experience with those? We do have one application (main feedwater pumps) where we installed new-fangled "fluid pivot" bearings from Pioneer. Somehow uses oil on the back side of the pad to support it rather than mechanical contact. http://www.pioneer1.com/engine...id-pivot-10-reasons/ You may remember that we called you up after we installed them because our vib jumped up. I think your initial idea was... [ more ]

Registered Member That's a reason for the ball and socket design over the ball on plate point contact, design. [ more ]

See all 44 replies...

Asset Condition ManagementPosts About vibration/alignment/balance

Two-Plane vs. Single plane spin balancing

Registered Member 12/17/129:53 PM

Another engineer and I have a different opinion on when a true two-plane balance is required. Actually we agree in principle but he's needs to see something in writing or data to agree with the 10 years of experience has shown to work.

We have a rotating part that's about 80% as long as it's diameter. The design calls out a two-plane balance with a broad balance weight area to support this, but no balancing vendor we work with believes a two-plane balance is required. They all do single-plane balance at/above operating speed and believe it would need to be quite a bit longer to require two planes.

So we're looking for a rule-of-thumb from a verifiable source on when single-plane is ok vs. two-plane.

When I skimmed the ISO standard, I saw no mention of doing single-plane dynamic balancing. Only mentions two-plane dynamic and single-plane static balance. So that didn't help.

Thanks,

Dave

Registered Member Zman, I agree with you 100% on your theoretical scenario. Cement plant ID fans are a very good example of this. Checking phase difference at the start should be standard practice. If little phase difference and similar amplitudes, then yes, single plane will work. If not, nod a two plane balance. [ more ]

Registered Member Dave, Well put. There are many reasons for the vibration to appear at multiple harmonics as well as broad band noise that can be for no other reason than a high imbalance force driving the system non-linear and exciting natural frequencies, causing impacting, etc. The 1x peak should still be predominant, but balancing can drive down all of the other energy very often. For any field tech that has been there, this has got to be obvious. I was stuck on a weekend balancing a 5KW gas turbine... [ more ]

Registered Member Here is some examples of how I relate to a single or a two plane balance. Have seen large and small fans with at least 4 harmonics of run speed be purely imbalance. Structure/base makes a big difference on how sensistive a machine is to imbalance and what type of vibration signature to expect. Have some manufactures that think just plain C channel makes a good base. The motors on these machines are 250-300HP 1800 rpm turning a rotating mass of 2500lbs with vibration levels on the motors over... [ more ]

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Asset Condition ManagementPosts About Asset Condition Management

Overhung Fan assemblies Which bearing should be fixed and floating?

Registered Member 2/19/0912:37 PM

Hello,

I would like to get some input on were a floating bearing should be installed in a overhung fan assembly. I have heard that the floating bearing should be on the fan side and fixed bearing on the drive/pulley side. I have also heard the opposite. Is there a standard? Or does each application differ? This would be for a belt driven fan.

Thanks

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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Welcome to AMPForum help

BREAKDOWN MAINTENANCE POSTING BOARD

Registered Member 6/1/081:43 PM

This website discusses topics related to CM/PM/RCM/ and relevant techniques for the same. In spite of all the hue and cry to avoid breakdown maintenance, I think , still a lot of maintenance manhour is spent on breakdown maintenance. Why we can not start a separate posting board dedicated to breakdown maintenance. I believe, breakdown maintenance only has provided insight for CM/RCM or any such thing to avoid such failures and getting an idea of failing things will lead us to a successfully avoid such things.
a thought for consideration pl.
Regards.
Akhtar

Registered Member I think it would also be useful as part of your site breakdown strategy that you have a management policy that every equipment breakdown that impacts on production is investigated using a Root Cause Analysis process that not only identifies corrective actions to get you back to where you were before the breakdown occurred , but also preventive actions that will prevent the breakdown or similar types of breakdowns from happening in the future [ more ]

Registered Member I think it better for newbie in maintenance field. My opinion about breakdown, if equipment breakdown it might be to restore back as soon as possible in the system by maintenance. But equipment have chance to failue as the same cause if reliability engineer's do not something. So, reliability engineer's must do something and economically concern as Josh saided. [ more ]

Registered Member First, where does or for which equipment does breakdown maintenance or run to failure strategy is applicable and economically viable option to do so? [ more ]

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Considering the software, which unit would you most likely buy for vibration analysis. Please consider the software!

Registered Member 11/12/144:20 PM

Asset Condition ManagementPosts About vibration/alignment/balance

Bearing Cross Reference

Registered Member 6/2/057:49 PM

Hey guys, working out of town and need a quick bearing cross reference: 75BC03. This is on a 700 hp IR Centac air compressor, motor drive end bearing. Would appreciate your help.

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