Coupling Failure

Torque multiplied by angular velocity is shaft power.

Based on your historical questions and this group of questions it sounds like you should hire a good mechanical engineer to come in and do an analysis of your mechanical equipment.

Already we had find the root Cause for the Failure and All Correction for the 3 Failures has been implemented and now it is running with out any abnormality.

My intension to post the 3 Threads is to know the possible reasons which i didn't come through during my analysation and to know deeply in design parameters.

Already we had a good Mechanical Engineers in our dept but taking suggestions from experts like you(CR 4 Team) will surely helps,supports and eliminates further failures .

Regads

Nithin

Failures will always happen. As systems gets more complex, the number of places where a system failure can happen increases. The root cause of any single failure can span a wide range of reasons. A few but not all of these reasons are poor maintenance, abuse, poor design, and a broad collection of scenarios known as end of life fatigue failures. In mechanical systems end of life failures are often related to metal fatigue from flexing but can also be from chance nuclear decay happening in a critical part of a metal's crystal lattice.

In short, entropy rules the universe.

When was the original equipment manufacturer contacted for advice and why has that advice been disregarded?

Here's a good article on that...

http://www.pem-mag.com/Features/How-to-avoid-coupling-failure-from-design-to-maintenance.html

I've got it! I know why you continue to break your equipment.

You cannot read and follow directions!

When one starts a thread on this web site, there are a collection of rules about posting a question here. One of these rules is that you should not post multiple threads for one question. One must scroll past these rules to reach the entry window, so you were obligated to read these rules before posting any of your three iterations of the same question. Since each of your threads starts with completely different text, you had to do this three times.

Since you cannot follow directions, I wonder if anything you tell us other than "Its broken" is true and valid. You claim that everything is aligned properly but to align anything one must follow the alignment directions. You cannot follow directions. I cannot believe you.

Oh snap!!!...(get it?)



If thread is checked by moderators before publishing for complete information/data, each of the others need not ask so many clarifications wasting time.

Who recommended this coupling?. Have you got a "manufacturer's catalog on how to size coupling"?. Did you check the alignment?.For the forum members why don't you give fluid handled,Q,H,recommended speed of pump,type of starter,design code/code letter of motor etc. Give webaddress of manufacturer.

Start here: http://onlinetools.ktr.com/cgi-bin/pump_web001.exe

And use bellhousing - you can´t miss it.

Alignment, Alignment, Alignment. The more mis-alignment you have, the more work the coupling has to do. If the motor power and speed is correct, then it is well within the capacity of a Rotek 24 coupling. What kind of pump is the motor driving, is it centrifugal or piston type pump. If the load is pulsing as is possible with a piston pump, it may hammer the coupling insert to destruction.

Exactly, Alignment is one of our problem .

And the Pump is Gear pump and it may have pulsing load during starting of the pump.

Generally how to Calculate the torque on the Coupling, any Formula, Pl suggest.

Why don't you tell us your findings?.

Also check vibration(anti-vibration mount) on either side of coupling,if there is relative movement of one side, coupling will break. Remember alignment is checked when pump is not rotating but during rotation things might get worse.

Do you know what is Rotex 24 coupling? and What has failed in that coupling?

Before failing, coupling must have called you by making sufficient abnormal noise or sound.

These couplings are one of the simplest couplings to maintain and do not need high skill to align. If this coupling is failing and you are sitting to analyse the failure, we can understand your seriousness.

Thank you for estimating my seriousness. We had find the root cause of the Coupling Failure and same Corrected. But i want to know the more reasons which results in Coupling Failure and the Same Time I want to the how much ( Torque) Imparts on the Coupling , thats why i mentioned Motor Details . Now the Coupling Perfectly alright with out any abnormality Just i want to share my Experience and gain knowledge further, that why i posted the thread Regards Nithin

One of the possible causes is "overheating". Give us details of damage caused to coupling.

Is like the coupling has failed in the sense of the torque, meaning that it has lost the "teeth" in the sense of rotation and then the metallic part has started to make some contact, until failure. I don't think that is a problem with the alignment.

I got an idea about the starting torque, sometimes the oil in the pump dump is really cold and with high viscosity. What do you think and do you have any idea of how to calculate this torque?

Thanks!

Hi! I'm dealing with the same problem, I got 2 rotex couplings with pumps that are breaking, can you tell what are the answers you got?

Thank you very much!

Is the alignment good? These couplings absorb shock loading, they are not intended to compensate for misalignment.

Can you send a drawing of coupling showing components,the type of load,is it fluctuating, periodical,delay between stop & re-start,are bearings of motor/machine not damaged,is flow/application of load is smooth or pulsating etc