February 23, 2005
Airborne Ultrasound Tip
When using airborne ultrasound to record readings for trending such as bearing readings, be sure to use the same instrument and serial number of both the ultrasonic receiver and contact probe. Some of the ultrasonic instruments in the marketplace are not “repeatable” from one unit to another. If you lose or break a contact probe and receive a replacement, be sure to disregard those previous readings if the newer contact probe or instruments are not within an acceptable range of 2-3 db’s. Some contact probes can vary widely. In other words you may or may not replace a good or failing bearing causing an unexpected downtime. If multiple models exist within your plant be sure to compare the readings to a known source and record those readings for reference.
Tip #2 - Ask your Ultrasonic vendor about repeatability!
Tip provided by Ultra-Sound Technologies, LLC
http://www.ultra-soundtech.com
Tel: (770) 517-8747 Phone
Find a one day Airborne Ultrasonic Workshop near you
February 23, 2005
Alignment Tip
The slickest way to correct for softfoot is illustrated in “Shaft Alignment Handbook”, Second Edition by Peter Piotrowski.
This method uses stainless steel shims modified in one of the following shapes:
Full Shape - unmodified
L Shape - One leg cut off
Front Side - Cut off both legs
One Leg - Separate a full length leg from full shim One Corner - one corner of a One Leg shim With these shapes, any soft foot can be eliminated with a minimum of shimming. This technique minimizes the chance of developing “squishy foot”.
The first step is to measure each foot with a feeler gauge at the 4 corners. Using the example in the book, we’ll shim one foot. The measurements are:
A= Inside Left = 0.012”
B= Inside Right = 0.024”
C= Outside Left = 0.018”
D= Outside Right= 0.030”
Find the smallest reading which is 0.012” at “A”.
Add a 0.012” Full Size shim under the foot.
Subtract 0.012” from all the measurements.
A = 0.012” - 0.012” = 0
B = 0.024” - 0.012” = 0.012”
C = 0.018” - 0.012” = 0.006”
D = 0.030” - 0.012” = 0.018”
Again, find the smallest reading greater than 0. This time it is “C” at 0.006”.
Since “A” is already = 0, no shim is needed at this location. All the other locations will benefit from a 0.006” shim. This new shim will be an “L” shaped shim with the part of the leg under “A” cut off.
Subtract 0.006” from all the readings greater than 0 A = 0 B = 0.012” - 0.006” = 0.006”
C = 0.006” - 0.006” = 0
D = 0.018” - 0.006” = 0.012”
The smallest reading greater than 0 is “B” which is 0.006”
A 0.006” shim is added under “B” and “D” by cutting a One Leg shim.
Subtract 0.006” from the values greater than 0.
A = 0
B = 0.006” - 0.006 = 0
C = 0
D = 0.012” - 0.006 = 6
“D” is the only shimming left. A One Corner 0.006” shim is placed at “D”.
This completes shimming at this foot. Shimming the other 3 feet is a repetition of these steps.
Tip provided by Jon McFadden
Vibration Analyst
Kimberly-Clark Corp.
February 23, 2005
RCM-2005 the Reliability Centered Maintenance Managers' Forum
March 9-11, 2005
Clearwater Beach, Florida
Time is running out to register for the most important RCM focused event of 2005!
The Reliability Centered Maintenance Managers’ Forum is a focused RCM event where maintenance and reliability professionals learn from each other through a series of informative learning sessions, short courses, networking opportunities and an optional full day workshop.
Participants will discover exciting new ideas and learn helpful techniques for implementing or improving reliability centered maintenance.
• Learn everything you need to build a world class Reliability Centered Maintenance Program
• Discover exciting new ideas and learn helpful techniques to jumpstart your Reliability Centered Maintenance program
• Learn how Maintenance & Reliability Professionals just like you are creating results with RCM
• Meet leading RCM service providers
• Learn how to track and report the business improvement results of your RCM program
To register please call 239-985-0317 or…
February 23, 2005
Motor Management Tip
Many motor management programs focus on: Energy efficiency; Repair vs replace decisions; Maintenance and Predictive Maintenance; and/or, Motor storage. However, few focus on motor life and reliability.
The objective of any true motor management program is to extend the effective useful life of the motor system combined with continuous improvement of the system. This includes:
• Energy improvements
• Motor system maintenance
• Motor system reliability
• Repair vs replace decisions
• Covers the incoming power to the driven load
Definition: Motor system maintenance and management is the philosophy of continuous improvement of all aspects of the motor system from incoming power to the driven load. It involves all components of energy, maintenance and reliability from system cradle to grave.
Tip provided by
Howard W Penrose, Ph.D.
T-Solutions, Inc.
http://www.tsoln-inc.com
Tel/Fax: 860 577-8537
February 23, 2005
Asset Basic Care Tip
Delivering Basic Care Information to Operations Staff
One of the keys to success in developing an asset basic care system is to have operations and maintenance work together to develop information collection and reporting procedures that both can live with.
Often, operations have a well-developed system in place to view plant status, using systems such as HMI (human-machine interface) displays and plant data historians (like PI from OSISoft). Acceptance of an electronic asset basic care program can be greatly increased if the data being collected by handheld computer can be automatically routed to the operator’s data system.
One oil refinery converted a very extensive paper-based inspection to an electronic asset basic care program. One of the primary goals was the ability to automatically deliver the asset status information to the operators via their control room software. This was accomplished using information directly collected from handheld electronic units. This allowed the operators to get immediate access to basic care findings without generating and reading reports, or by looking up status information in another software package.
This tip provided by Design Maintenance Systems Inc.
DMSI
http://www.desmaint.com
Canada Tel: (604) 984 3674
February 23, 2005
Oracle and PeopleSoft—Better Together (Webcast)
Combined Companies Launch
On January 18, 2005, Oracle announced, at an event at its headquarters with more than 48,000 joining by Webcast and phone, how the nearly 50,000-strong combined workforce of Oracle and PeopleSoft will provide unparalleled innovation and support to 23,000 applications customers throughout the world.
February 23, 2005
Vibration Tip
Spectrum vs. Cepstrum
When a spectrum contains several sets of sidebands or harmonic series, it can be confusing due to the overlap. Try using a Cepstrum. A cepstrum is a spectrum of a spectrum. In the cepstrum, they will be separated in a way similar to the way in which the spectrum separates repetitive time patterns in the waveform. Try using a cepstrum on your Gearboxes and rolling element bearings.
Tip provided by LUDECA, INC.
Distributor of the new VIBXPERT data collector/vibration analyzer
http://www.ludeca.com/vibxpert.htm
Tel: 305-591-8935
Download the Taking Accurate Vibration Measurements Case Study at Ludeca.com
February 23, 2005
Motor Testing Tip
Understanding and using inductance measurements:
If you measure the inductance of a 3-phase motor with the rotor removed the measurements should be balanced. In an assembled motor, mutual inductance between the stator and rotor causes the inductance to increase. Depending on motor design, there may be an inductance unbalance between phases that can be 20% or higher. Moreover, the measured inductance of each phase and the amount of unbalance will vary with the position of the rotor.
By measuring inductance at 24 or 36 equal rotor positions on all three phases through 360 degrees of rotation, and graphing the results, rotor health can be evaluated for conditions including broken rotor bars, high resistance joints and eccentricity (rotor air gap).
However, since many motors will exhibit inductance unbalance and this unbalance can change with rotor position, inductance alone is a poor indicator of winding health. In Addition, most winding faults in a 3-phase motor will not show a significant inductance unbalance until the winding has developed a short.
Static inductance measurements when combined with impedance measurements from a low-level sine wave instrument are useful for detecting either contaminated or over-heated windings.
Tip provided by ALL-TEST Pro, A Division of BJM Corp http://www.alltestpro.com
Tel: 860.399.5937
February 16, 2005
Running Out Of Time For RCM-2005
Don’t miss this opportunity to spend three focused days in the wide world of Reliability Centered Maintenance.
Reliability Centered Maintenance Managers’ Forum
March 9-11, 2005
Clearwater Beach, Florida
• Learn everything you need to build a world class Reliability Centered Maintenance Program
• Discover exciting new ideas and learn helpful techniques to jumpstart your Reliability Centered Maintenance program
• Learn how Maintenance & Reliability Professionals just like you are creating results with RCM
• Meet leading RCM service providers
• Learn how to track the results of your RCM program
It is Spring Break in Florida and Clearwater Beach Hotels are filling up fast - so please register today at 239-985-0317 or…
February 16, 2005
Computerized Maintenance Management System (CMMS) Tip
How to avoid CMMS/EAM System Failures
Failure #9 Inadequate training/documentation
Many companies will still purchase software and try to “learn by the manual.” This is a very costly and time-consuming way to learn how the software functions. It is best to have the vendor’s training personnel train your people. If you allow your people to flounder or to let the vendor’s programmers train your people will spell sure disaster.
It takes a certain type of person to train for software use, and part of the selection process should include the evaluation of the vendor’s training personnel. Again, reviewing the training programs of Companies already using the software will ensure the program produces satisfactory results. Training and documentation also suffer when Companies try to reduce the cost of system implementation. One of the first areas they reduce is the amount of training or the number of sets of documentation. This practice results in poor utilization of the system.
Tip provided by GenesisSolutions
Terry Wireman, CPMM
Tel: (203) 431-0281
http://www.GenesisSolutions.com
iPresentation Tutorial Invitation: Conducting an Effective EAM/CMMS Training Program
