VibMatters April 2016 2

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The Vibration Analyst’s Newsletter Series 3, Issue 4 – April 2016 In this issue: Featured Lesson: Rolling Element Bearings – Condition Monitoring – Part 2 page 1

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FEATURED LESSON

Rolling Element Bearings – Condition Monitoring Part 2

Featured Training Video: Bearing Failure Analysis

In our last issue of Vibration Matters, we

will need to find the axis of the angle of

page 2

began looking at incipient bearing faults,

the bearing. If it was cocked vertically (i.e.

paying attention to their root cause and

the top pushed in and the bottom pulled

how we can minimize their reoccurrence.

out) then the 180 degree phase difference

We identified cocked bearings, looseness,

will be from top to bottom.

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lubrication and rotating element skidding.

page 3

In this issue, we will continue by looking at

---------------------------Mobius Presentations at the Reliability Conference in Las Vegas page 3

---------------------------Upcoming Global Vibration Analyst Certification Courses Page 5

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installation issues, excessive clearance and rotating looseness. If you missed the last issue, you can download it here.

Installation errors If the bearing is cocked on the shaft, we expect to see increased amplitude at 1X, 2X and/or 3X. The key indicator is phase – take measurements on all four sides of the shaft. If the bearing is cocked on the shaft, we will see a 180 degree phase shift left to right and top to bottom – it is rotating. If the bearing is cocked in the

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housing, there will be a 180 phase change from one side to the other, however you

Clearance Excessive clearance can lead to looseness if there is a driving force and to skidding if there is low load or an incorrect lubricant. If the bearing is skidding, there will not be a

periodic

frequency;

instead

high

frequency noise is generated. This is

FEATURED TRAINING VIDEO:

because there is a rubbing rather than an

Vibration Analysis:

impacting.

Bearing Failure

If bearings are skidding they can heat up

Analysis

the following example.

and even catch on fire as you will see in

The cause The roller bearings in the motor require 30% of their design load to operate correctly. When the load is removed, the rollers skid and cause heating. When the This presentation explains why bearings fail, how to detect the defects and how to extend the life of rolling element bearings. This topic is relevant to our featured topic; condition monitoring of rolling element bearings, and one we would recommend that you see.

The figure above shows the burnt up

machine was balanced and aligned, the

bearing from a condensate extraction

loads were greatly reduced, the bearing

pump motor. The motor had run for 24

skidded causing the grease to vaporize

years without problems. Recently the

and finally ignite. In order to resolve the

motor was rewound, the rotor was

problem a new motor was installed with

balanced, new bearings were installed

deep groove bearings on the drive end.

(cylindrical roller DE) and the unit was laser aligned.

motor DE bearing over heated and the Another overhaul was

Rotating looseness may be the result of

completed, the rotor was balanced and

the shaft loose in the bearing or the

aligned again and new bearings were

bearing loose in the housing. Either way,

installed.

rotating looseness results in a series of

motor stopped. Length: 47 min

Rotating looseness

Three months later, the

high 1x harmonics in the spectrum, often

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Six months later a loud explosion rocked

out to 10x. This may be accompanied by a

the whole station. When someone went to

raised noise floor as the result of random

investigate they found the DE bearing on

vibration or random impacting. If phase

fire and they shut the machine down.

measurements are collected you will

Both coolers had been blown off the

notice that the phase readings do not

motor. One of them flew 3 meters away

remain steady. This is because the phase

and just missed a hydrogen carrying pipe.

reference on the shaft is not remaining

The whole motor was scrapped.

steady because it is loose. In any case, an unstable

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phase

reading

is

another

indication of rotating looseness.

Bearing loose in housing or slipping on shaft A bearing loose in its housing may result in a high 4x peak and a bearing slipping on the shaft may result in a high 3x peak. *Case study and photos are courtesy of Simon Hurricks, Genesis Energy, NZ. Thanks Simon!

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Meet Mobius in 2016! Reliability Conference April 11-16, 2016 Las Vegas, NV, USA http://reliabilityconference.com Learning Lab & Exhibition Booth

SIRF Condition Monitoring, Lubrication & Reliability National Forum 2016 April 19-20, 2016 Surfers Paradise, QLD, AUS http://www.sirfrt.com.au/calendar/event_detail /4315 Presentation & Exhibition Booth

Vibrations Association of New Zealand Conference 2016 May 10-12, 2016 Queenstown, NZ http://vanz.org.nz Presentation & Exhibition Booth

Uhre & Nybæk Vibration Analysis Seminar May 26-27, 2016 Denmark http://www.uhrenybaek.dk/?page_id=238 Presentation

Euromaintenance 2016 May 30 - June 1, 2016 Athens, Greece http://www.euromaintenance2016.org Presentation & Exhibition Booth

Lubrication, Maintenance & Tribology (lubmat) 2016 June 7-8, 2016 Bilbao, Spain http://www.lubmat.org Presentation & Exhibition Booth

SMRP Conference 2016 October 17-19, 2016 Jacksonville, FL, USA http://www.smrp.org/i4a/pages/index.cfm?pag eID=3831 Presentation & Exhibition Booth

2016 IMVAC - Orlando October 31-November 2, 2016 Orlando, FL, USA http://www.vibrationconference.com Presentations & Exhibition Booth

International Maintenance Conference 2016 December 12-16, 2016 Bonita Springs, FL, USA http://reliabilityweb.com/events/event/imc2016 Exhibition Booth

Mobius at the Reliability Conference in Las Vegas Mobius Institute’s Jason Tranter is conducting Learning Labs at the Reliability Conference in Las Vegas this week. Topics include:

Condition Monitoring is Not Enough: You Can’t Monitor Your Way to Improved Reliability In plants around the world, condition monitoring programs are established to improve plant reliability. The trouble is, in the majority of those plants, those programs don’t actually improve reliability at all. In this presentation we will explore (briefly) how the condition monitoring does benefit the plant (even if it does not improve reliability), and propose how the condition monitoring skills and technologies can be used to actually improve reliability. • • •

Learn why most condition monitoring programs do not improve reliability Learn about the benefits delivered by those programs. Learn how the condition monitoring technologies can be applied to make substantial improvements in plant reliability.

An Animated Introduction to Vibration Analysis Vibration analysis provides an extremely powerful opportunity to learn about the condition of rotating machinery – but only if you understand it and can use it properly. This highly graphical and animated presentation will explain the origin of the vibration frequencies, amplitudes and motion, and introduce the spectrum, time waveform and phase. You will be amazed how much you can learn in such a short time! • • •

How does vibration analysis provide a key insight into the health of rotating machinery. Where does the spectrum come from, and what do those peaks mean. What does the time waveform and phase readings tell you that you cannot learn from the spectrum alone.

What Every Reliability Engineer Needs to Know About Improving Reliability While you could focus on condition monitoring and improvements in maintenance practices, you will achieve far greater results by taking a holistic approach to reliability improvement. We have to start with the design process and work our way through every phase to ensure that we do not introduce the “defects” that reduce our reliability and thus increase the cost of ownership. This interactive short course will provide you with a “roadmap” so that you have a clear understanding of what changes need to be made, and the benefits of each of those changes. This is a proactive approach; getting ahead of the problems before they cause downtime or cause safety incidents. It is also a proven, practical approach that does not require engineering degrees or months of analysis. We explain the technology but we emphasize the need to develop the reliability culture. • • •

Why you should take a proactive “defect elimination” approach instead of a reactive condition monitoring + RCFA approach. How to develop the reliability culture in everyone from senior management down to the plant floor. A “roadmap” that will provide guidance and help overcome the most common challenges.

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6/7/2016

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Alabang, Muntinlupa City, PH

6/13/2016

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FABRIANO (AN), IT

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