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Shoreline Reliability,  the northeast LUDECA Solutions Provider, was a proud supporter at the 44th Annual New York Citywide Graduating Apprentice Contest.  In the contest the graduating Millwrights were asked to layout, assemble and align a bevel gear project along with blueprint reading and perform laser shaft alignment demonstrations using the ROTALIGN® ULTRA iS. All tasks were directly related to what the graduating apprentices will encounter in the field. The contest was held at the New York City District Council of Carpenters Labor Technical College, where the millwright courses have utilized the OPTALIGN® and ROTALIGN products dating back to the mid-1980s. The forward-thinking school also plans to incorporate the CENTRALIGN® ULTRA for bore alignment as well as introduce vibration analysis and balancing with the VIBXPERT® II.

The contestants had 7 hours to complete all tasks and were judged on accuracy and precision. This year’s Millwright winner was Michael Giorgi, followed runner-up Michael Daniels and 3rd place went to Mohammed Arif. Congratulations to all participants and we look forward to many more years of working together with the NYC District Council of Carpenters Labor Technical College.

A lot of maintenance employees believe that small machine trains can be precision aligned more quickly and easily than larger machine trains. This is not always the case!  Smaller machine trains are usually less rigid. This can cause the alignment to shift as the anchor bolts are tightened.  Almost all small machine trains have some form of soft foot condition that must be corrected because the machine bases are often not flat or of inferior construction. Additionally, thermal growth can have a large impact on smaller machine trains as well.

Don’t be fooled by the size of the equipment you must precision align. It is critical to understand how the size, design, operation, and other factors affect the equipment you must align.

In the previous article,  we covered the advantages of continuous monitoring over the “snapshot” method for thermal growth measurement. We also highlighted the superiority of these methods over the existing simple thermal growth calculations and static “hot alignment checks.”

Continuous monitoring is a feature with the ROTALIGN® ULTRA LIVE TREND and the PERMALIGN® system. The most common question we receive with regards to these systems is “If LIVE TREND and PERMALIGN both offer continuous monitoring,  why should I pay more for the PERMALIGN system?” The answer to that is that you have to pick the right system for the requirements of the job, and not just look at the price. The following are some factors to consider when choosing between LIVE TREND and PERMALIGN:

Monitoring Time
ROTALIGN ULTRA LIVE TREND was designed to provide short-term continuous monitoring. You could risk running out of power from the 9-volt laser battery for situations where the measurement lasts for more than 50 hours. Continuous computer operating time on battery power alone will be less (24-36 hours). This is still a generous amount of time to monitor and would suit most users.
PERMALIGN was designed to provide long-term continuous monitoring. The laser transducers are nitrogen sealed and purposely designed to maintain long-term stability for longer periods of time. In fact, the longest-running PERMALIGN job was 2 years and the data returned to within 1 thousandth of an inch of the starting position!

In thermal growth measurement, it is always better to have more than less. There have been many jobs where 1-day monitoring turned into a 1-month monitoring job. For those situations, you would be glad to have the long-term monitoring capability of PERMALIGN.

Temperature and Environment
ROTALIGN’s industry-leading 5-axis sensor (used with LIVE TREND) is designed to operate continuously within a range of 32°F – 113°F (ambient temperature). It features an IP65 rating against dust and water ingress protection.

PERMALIGN, features two laser transducers that operate within a range of 32°F – 158°F. PERMALIGN also features PCD sensors that operate in the infrared frequency spectrum. The result is a superior signal-to-noise ratio for harsh industrial (dusty and steamy) conditions. Because of this, PERMALIGN has our highest recommendation for boiler feedwater pumps (our #1 application for thermal growth monitoring), and steam and gas turbines.

Measurement Capability
Live Trend and PERMALIGN both work by measuring the inboard bearing housing movement to calculate shaft misalignment from positional changes occurring between the stopped and fully loaded final running condition of the machines. This method reliably gives information on the relative movement between two machines. PERMALIGN can be expanded to provide up to 16 channels of continuous monitoring capability. With a requirement of 2 sensors per coupling, this means that 8 couplings can be simultaneously monitored. This is an ideal solution for monitoring the movement of a boiler feedwater pump machine train.
PERMALIGN can also be expanded to provide absolute positional change monitoring capability. For this application, the sensors are mounted on sturdy pedestals attached to the foundation. The pedestals are often lined with insulation and have a continuous stream of groundwater pumped through them to ensure pedestal temperature stability. This permits monitoring of machine movement with respect to the foundation.

At this point, let us point out that we are comparing two very good systems that provide superior thermal growth measurement capabilities over other more primitive methods. The ROTALIGN ULTRA is in a class by itself for shaft alignment. The addition of LIVE TREND takes it beyond that level by providing continuous monitoring.
Since 1989, PERMALIGN has been in a class by itself for laser-based thermal growth monitoring. There is no laser system that can compare to the performance of PERMALIGN for thermal growth monitoring. Whether you choose LIVE TREND or PERMALIGN, remember that it is the requirements of the job that you must consider first.  Once you have chosen the best system for your application, you can obtain true thermal growth compensation to increase the performance and lifespan of your rotating machinery.

In the previous article,  we discussed two methods for thermal growth monitoring, the “snapshot method” and “continuous monitoring”. With the “snapshot” method, we only knew the initial and final thermal growth readings, with no information in between.  Some typical “snapshot” results are shown below:
Vertical Offset: -24.4 mils
Vertical Angularity: 15.2 mils/10″
Horizontal Offset: -12.3 mils
Horizontal Angularity: 7.5 mils

“Continuous monitoring” is exactly what it says: the thermal growth is “continuously monitored”. Our ROTALIGN® ULTRA LIVE TREND and PERMALIGN® thermal growth monitoring systems work in this way.
Alignment readings between the machines are taken at preset intervals for a predetermined amount of time. The relative alignment changes are then clearly displayed as a set of graphs. Here are the same “snapshot” readings, but this time displayed as a continuously monitored measurement from the ROTALIGN ULTRA LIVE TREND.

Notice the chart displays the same final “snapshot” alignment readings, but this time we see the graphs of all the positional changes that occurred along the way, from the starting to the ending position, which are not readily apparent with the simple “snapshot” method. These graphs reveal the following:

• The vertical offset had moved in the positive direction and then changed to the opposite direction.
• The readings stabilized in the last 40% of the measurement.  This shows us that the final readings were taken when the machine had stabilized.
• There are no sharp drops or radical moves.  We are assured the bracket was not bumped or hit during measurement.
• The readings were consistent, indicating that vibration was not severely influencing the results (which can be compensated for by simply increasing the number of points taken per measurement at each interval).

It is essential to get dependable and reliable results for thermal growth studies because you will be deliberately misaligning a machine for the purpose of improving the alignment. Individual events during the monitoring period can be tagged and commented upon, thereby allowing the effects of external actions (such as opening or closing a valve, changing the load on the machines, or starting a nearby machine, say) to be documented. The extra information gathered by continuous monitoring is very useful for thermal growth monitoring. Continuous monitoring provides essential evidence for the user to confidently state, “it is what it is”, with regards to misalignment due to thermal growth.

In Part 3 of this article, we will discuss how to choose a thermal growth monitoring system.

“Thermal growth” often refers to the change in machinery positions as a machine runs from startup to operating conditions (or vice versa). Machinery positional change can also be caused by dynamic forces,  pipe stress, and other factors. Compensating for thermal growth is necessary because the machine will be misaligned during operating conditions if it is not.

We offer two methods for the measurement of thermal growth.  One is a “snapshot” method and the other is continuous monitoring. Our current line of M3 brackets provides an accurate and easy-to-use method to take a measurement using the “snapshot” method.

A reading is taken by mounting the sensors and rotating both brackets to create a “virtual” shaft alignment reading across the coupling. Measurement is taken before and after the machine is running. The difference between the two measurements is the change in the alignment.

M3 brackets provide a cost-effective method of measuring thermal growth because they can be used with any of our current shaft alignment product lines. It should not be confused with the static “hot and cold alignment check” (where shaft alignment equipment is mounted on the shaft and readings are taken conventionally, before and after startup, on a machine that is not running). Assuming that the bracket was never bumped or moved during the measurement, the results are much more accurate than those obtained by the static “hot and cold alignment check”. Below are typical results one could expect to see from startup to running conditions:

Vertical Offset: -24.4 mil
Vertical Angularity: 15.2 mil/10”
Horizontal Offset: -12.3 mil
Horizontal Angularity: 7.5 mil

You will probably notice that a significant amount of angularity exists, which goes against a lot of assumptions in thermal growth calculation methods where it is assumed that the machine will grow an even amount. When taking thermal growth readings using the “snapshot” method, you will want to confirm (establish repeatability) the measurement. This can be accomplished by taking another reading on cool down. The difference in the cold-to-hot and the hot-to-cold readings should be very similar, but with the opposite sign. This is an essential practice because you are making the assumption that the bracket was never accidentally moved or bumped. In Part 2 of this article, we will show how “continuous monitoring” can provide a more complete and accurate picture of what is going on with thermal growth.

WATER/WASTE PROCESSING • December 2012

Production plant analyzes resonance anomaly; looks at condition monitoring program as a profit center

Sometimes in industry,  mechanical “circumstances” change. When it happens,  a machine train identical to other machine trains can suddenly become atypical. This was exactly the case for Process Water Supply Pump A, whose behavior was very similar to that of its sister pump trains until something changed. In this article we discuss a problem that was abruptly encountered, the methods used to investigate it and the solution devised.
One of four identical pump trains mounted to a common piping system experienced a catastrophic motor (75 hp, 4 poles) failure. The motor could not be saved, and a new motor was purchased and installed. After installation, the pump was started with the new motor. High vibration caused the installers to immediately shut it down. The new motor had been laser aligned to the pump; therefore the alignment was not suspect; therefore vibration data was taken.

Read the entire article “Where is that vibration coming from“.

Thanks to Roger Earley with LUBRIZOL for sharing this case study with us.

Right angle drives or 90-degree gearboxes are very common in the industry. These are speed reducer/increaser machines with an output shaft exiting at a 90-degree angle with respect to the input shaft. In some cases, the 90-degree turn stays on the horizontal plane. This is great because the alignment can be treated as a machine train alignment.

However, when a gearbox has an output shaft emerging vertically, the alignment becomes much more complex. This coupling should be treated as a vertical alignment, where the support of the machine is a flange, whose feet are visualized as being the flange bolt pattern where shimming takes place to correct angular misalignment. This fictitious flange is to be placed at the plane of the feet, where the shims are to be inserted or removed. Having a system that will allow you to customize the bolt pattern and bolt positions is critical in this case. Depending on the existing conditions at the gearbox feet, you may wish to choose a positive, negative, or optimized (+/–) shimming solution in order to minimize the axial effect of any shimming corrections. Offset corrections are performed by moving the machine laterally only after angularity has been corrected.

What if the shaft is not in the center of the machine but offset to one side? With the proper laser alignment system, the user can set up the alignment job so that the true shaft geometry within the machine frame is correctly represented. Only in this way can we obtain the proper corrections at the machine’s feet.

The Reliability Support Team at the Eastern Processing Facility located at Cape Canaveral Air Force Station,  FL,  won Uptime Magazine’s Best Design for Reliability Program award.

During the design phase of their program, the team was challenged with the implementation of Reliability-Centered Maintenance (RCM) principles and Precision and Predictive techniques from construction through commissioning. These have proven to be the most advantageous with regard to failure mode consequence reduction.
Congratulations to Frank Saukel, Garry Pell, and their team for this prestigious award and a job well done!

Program Highlights
1. Eastern Processing achieved Failure Mode Reduction with added redundancy.
2. They redesigned the facilities’ Reverse Osmosis Water System.
3. They performed Asset Prioritization based on safety, environmental, mission impact, and probability of failure studies.
4. They trained technicians and engineers on RCM. In the words of Garry Pell: “Don’t expect to gain tribal knowledge if you don’t invite them into the Teepee. Get your people involved from engineering to safety, from shipping to operations.”
6. They developed all maintenance procedures based on RCM decisions.
7. They identified the Predictive Maintenance (PdM) technologies and tools they needed, met with different vendors at different IMC Conferences, then focused, implemented, and trained on 1 or 2 maintenance and

Condition Monitoring (CM) technologies annually, including:
• Lubrication analysis
• Vibration analysis
• Laser shaft alignment
• Infrared thermography
• Ultraviolet thermography
• Electric signature analysis
• Ultrasound
Many discrepancies were corrected using these PdM and CM technologies. According to Frank Saukel, “Every one of the PdM technologies has paid for themselves.” For instance, they identified misalignment and motor structure resonance conditions using their VIBXPERT® vibration analyzer on several of their water pumps which had been aligned by a contractor.

Every pump was found to be bolt-bound and base-bound. They realigned all their pumps to excellent tolerance with their ROTALIGN® ULTRA laser alignment tool.

They also found and corrected electrical deficiencies with ultraviolet thermography and detected sub-grade piping leaks with ultrasound. Their precision lubrication program included oil analysis, with a resulting reduction in the number of lubricants, minimization of cross-contamination, and implementation of a color-coded system for easy machine identification and the use of accessories to control moisture. Learn more…

When performing an alignment on a machine train with a motor fitted with a sleeve bearing,  it is important to account for the magnetic center of the motor. Failure to do so can cause excessive vibration and premature failure of motor components and the shaft coupling.

If the motor has recently been rebuilt it should come from the motor shop with a magnetic centerline scribed on the shaft. To properly set the shaft coupling gap do the following:

• Determine the correct coupling gap based on the manufacturer’s recommendation. (Note we refer here to the proper installation gap size and its tolerance, not the alignment gap tolerances for angularity.)• Identify the correct scribe mark on the shaft that represents the magnetic center.
• Measure the distance between the scribed mark and the outside bearing housing lip. In the case that the magnetic center scribe mark falls inside the motor housing while at rest, scribe a mark in the rest position.
• While the machine is un-coupled run the motor and estimate the difference between the newly scribed mark and the magnetic center mark. This is the distance that will need to be compensated for when setting the coupling gap.
• Set the coupling gap according to the manufacturer’s recommendation minus the distance measured for the magnet center correction if the mark is outside the bearing housing. Add the difference if the mark is inside the bearing housing. This will provide the proper coupling gap under the normal running condition.

The Hibbing Taconite Company,  managed by Cliffs Natural Resources of Hibbing,  MN, won UPTIME Magazine’s Best Lubrication Program award. At the heart of their condition monitoring efforts is the Oil Analysis component of their lubrication program, key to helping them identify problems at an early stage of failure.
During the first phase of the program, which they called “First Evolution”, reliability engineers were trained as Level I Machine Lubrication Technicians (MLT1). Thereafter, dedicated lubrication mechanics were assigned to the plants to monitor the condition of the oil. They engaged with their vendors to identify needed parts and reviewed their planning, scheduling, and work execution. They selected critical equipment on which to prove the concept.

During Phase 2, MLT1 training continued, including lubrication mechanics and supervisors. Critical equipment underwent lubrication upgrades with the addition of desiccant breathers, sight tubes, sample ports, and quick couplers for filtering, allowing for safer filter changes and reducing cross-contamination risk.
Today, 80 employees have been MLT1 trained on machinery lubrication and basic oil analysis. Employees are fully engaged and enjoy wholehearted management support as significant consumption reduction was realized. Management views the program as an investment.

During their presentation at the IMC-2012 International Maintenance Conference, Reliability Engineer Dan Lerick shared that in certain applications, they have proved a 3.5% energy reduction by switching to synthetic gear oil, which also extended oil drains from 5 to 15 years. Another positive was the switch to synthetic engine oil where they observed a reduction in fuel usage and fueling time, with an extension in engine life and extended drain and maintenance intervals.  Overall ROI was under 1 year!

In addition to their award-winning Lubrication Program and as part of their reliability efforts, the company uses CMMS software and other Predictive Maintenance technologies such as Ultrasonic examination, Laser Alignment with ROTALIGN ULTRA, etc. Learn more.
Congratulations to Dan Lerick and his team for this award and a job well done!

Program Highlights
1) Fluid Analysis consolidated across all Cliff operations. They now use a single oil lab after carefully ranking and comparing sample results from eight different labs. The benefit was consistency and the ability to review and compare data.
2) For Fluid Sampling, they developed sample standards per equipment specs, installed sample ports, and trained personnel on how to collect samples. Their CMMS system controls their sample frequency.
3) The use of Grease Systems and Grease Routes wherever possible along with ultrasonic technology on motors.
4) Implementation of condition monitoring (CM) via oil moisture sensors and CM sensors for real-time monitoring. The immediate benefit was a reduction in overall site oil consumption by removing water contamination.
5) Cleaner and safer fluid changes with the use of dedicated Lube Carts to eliminate drips and spills.
6) All machines were tagged with machine identification and lubrication information to reduce mixing and cross-contamination.

We are proud to release a new version of our “Laser Align” mobile application. The app is available in the iTunes Store for both iPhone and iPad; as well as in Google Play for Android. The application now has an interactive Tolerance Table,  where the user can input his own machine RPM and the app will kick back the respective Alignment Tolerances for both short flex and spacer type couplings. It also includes a Thermal Growth Calculator and now has a Soft Foot Assistant to help the user interpret soft foot values.

The app is available everywhere for FREE. Download now.

We recently ran a poll to find out what the Top Machine Faults are for the attendees of the IMC-2012 International Maintenance Conference. Here are the results,  which came from maintenance and reliability professionals who attended our Learning Lab:

Misalignment: 32%
Bearing Failure: 31%
Unbalance: 18%
Looseness: 16%
Other: 3%

The good news is that all our lab participants were acquainted with our Condition-based Maintenance tools which can help them detect,  prevent and correct all these problems.
It is essential to understand how equipment performs in a facility and to be able to identify these common machine reliability issues before they result in functional failures in your equipment. Payback technologies like vibration analysis, alignment, and balancing when part of a comprehensive condition monitoring program can improve your equipment performance, reduce equipment downtime and minimize risk.

Rotalign® Ultra LIVE TREND is by far the most cost-effective and technically competent tool to monitor pipe strain per API standards. LIVETREND allows maintenance personnel to monitor and record digitally the alignment offset changes at each coupling hub face,  thru the entire bolting procedure,  as specified, while comparing it to the final unit alignment if desired.” —Marty Krueger, Tern Technologies, Inc.

API 686 (Chapter 4, Piping Alignment) notes that the basic method of verifying pipe strain and its effect on the machinery is to monitor shaft alignment with dial indicators or lasers thru the machine flange torquing procedure. API 686 allows that an alignment change of +/- 0.002″ is acceptable while monitoring at the hub of the opposite machine (unless there is common piping between the two machines, then alignment changes should be noted at both hubs).

LIVE TREND allows the user to monitor the alignment change at both hubs, simultaneously and in real-time (at a user-specified data collection frequency) through the complete piping/flange torque procedure.  The system program also allows the user to “flag” and note each step of the procedure (suction line complete, discharge line complete, etc.).  LIVE TREND also allows the user to enter the final shaft alignment values (or actually take the final shaft alignment prior to start and import that data into the LIVE TREND program) so that the user not only can note the changes at the hubs as a result of the pipe/flange torque but also to note immediately if the change is within (or exceeds) the final alignment tolerances if the movement exceeds the +/- spec as per API.

It should also be noted that the LIVE TREND can be used to monitor the alignment thru the “Spring Hanger Function Checks” and any effects of possible piping strain to the machine during tear down, prior to overhaul, to give the user advance warning (and subsequent time to plan) for possible piping issues that might arise during reinstallation and re-attachment of piping.

Vibration analysis is the best all-around technology for diagnosing and predicting problems in rotating machinery. Over the years I have seen time and time again where adopters of this technology have saved themselves and their companies countless man-hours and thousands of dollars by getting to the root cause of a problem early on. By analyzing the data,  they are able to schedule their valuable time on the right problem on the right machine long before the problem escalates into a major outage or emergency. But too many companies have not adopted vibration analysis. While it is true that one could spend many years learning the skills of the multiple levels of the vibration analysis disciplines,  it is also true that even a basic understanding of the relationship between the time waveform and the spectrum can yield huge benefits and savings to a new user.

For example, the root cause of most roller bearing/seal failures is either shaft misalignment or rotor imbalance, which can take months to develop. It is also the most common problem analyzed within most facilities in the first two years of vibration analysis implementation. The good news is that misalignment and rotor imbalance are the easiest problems to diagnose by observing a high amplitude 1× running speed frequency in the spectrum. After that, a phase analysis with your analyzer can easily differentiate between misalignment or an imbalance problem and quickly completed without shutting down the machine.

We all know that Rome wasn’t built in a day but we all must start somewhere and just a few days in an analysis class could yield major benefits to new companies.

Thanks to Jay Gensheimer with Solute LLC for this valuable post.

Often,  seal failures are not the cause of an incorrect installation or the wrong seal type for the product being pumped,  but a symptom of misalignment. If a seal starts dripping or misting product within days after installation, or suffers a “catastrophic” failure within weeks of being placed in service, the first suspect should not be the seal vendor or the technician installing the seal; misalignment should be considered as a good candidate for the cause of failure. Visualize a typical pump-motor system of bearings, shafts, seals, and coupling. The weakest link in the chain is usually the mechanical seal. In the last ten years, seal technology has progressed substantially in both material composition and design (most notably cartridge seals), in compensating for shaft vibration.

However, significant misalignment can still overwhelm the ability of a seal to keep both seal faces pressed firmly together or to withstand seal face cracking.

So remember, the next seal failure you encounter, quickly check misalignment with a good laser alignment system to see if the weakest link has failed due to misalignment.

There are several ways of looking at alignment tolerances,  including standard versus vector tolerances, as well as sliding velocity tolerances. The most used are standard tolerances, but which are applied differently for short flex versus spacer couplings. The best laser shaft alignment systems will allow you not only to select tolerance types but also coupling types. For standard tolerances, keep in mind that the vast majority of true flexible couplings (such as gear, grid, elastomer element, or diaphragm type) have two separate flex planes. So do all spacer couplings. The difference between short flex and spool piece, spacer, or jackshaft couplings lies in the distance between these flex planes. Any time the distance between flex planes is greater than the diameter of the working flex plane, you are better off calling it a spacer rather than a short flex, from the perspective of achieving satisfactory alignment.

Keep this in mind when selecting coupling type, as it will greatly increase the alignability of the machines, and ease your job in the field. For a deeper understanding of the subtleties involved in these issues, it is recommended to attend an in-depth training course in laser alignment.

Check out the Easy-Laser XT Series, the only laser alignment platform on the market today with the new ANSI alignment tolerances built-in giving the user the freedom to choose between traditional tolerances, the new ANSI standards, or custom tolerances of the user’s own choosing.

When performing a multiple belt-sheave alignment,  it is imperative that all the belts and belt grooves are inspected individually for wear. If any of the belts are slipping,  then all belts must be replaced at the same time. To achieve an accurate alignment between the pulleys one can use a machinist’s straightedge, or place a tightly drawn piece of string, across the faces of the sheaves to see if all four points of contact are made or you can utilize a Laser Pulley Alignment tool. Regardless of which system is used to perform the alignment, it is a good practice to monitor any changes in angularity and/or offset in the sheaves as the hold-down bolts of the machine to be moved are being tightened during the belt tensioning procedure, since this will allow the sheave alignment to be maintained true.

I have been using the ROTALIGN® ULTRA for about one year now and it has made my job easier and faster. I like the ease of the installation of the tool. No more need to multiple dial indicators and carrying different mounting brackets! Everything in the ROTALIGN ULTRA is snug and compact in its own case. All I have to do is grab it and go! The ROTALIGN ULTRA is by far one of the easiest computer-based tools I have ever used; from installing it on the machine to navigating through the screens. One of my favorite options is the “constant sweep” mode. Once you get your laser set and you’re motor data programmed,  just hit “go”! Another nice feature is the “Soft Foot Wizard”. No more fighting with dial indicators on each foot pad. The ROTALIGN ULTRA is so effective,  it even tells you how much to shim on each foot pad! This has saved me so much time and hassle.
I have used the ROTALIGN ULTRA for Land O Lakes, Disney Land Theme Parks, Rexam beverage, Guardian Glass, Alza Corporation and many more.
One of my favorite things about the ROTALIGN ULTRA is the ease of giving the customer a report as soon as I’m done with the job. I’ll I have to do is save my report and transfer it to a thumb drive. At that point, I take it to the customer and have him save it to his computer! No more need to go back to the shop, download it to my computer and print!
I have done a lot of research on other brands of laser alignment tools and have had the sales representatives do demonstrations on them but when the representative for ROTALIGN ULTRA came to Capitol Air Systems for his demonstration, I knew this was the one for us. It was one of the best demonstrations hands down and the representative even let us get familiar with the operations of it. The time that the ROTALIGN ULTRA has saved me has well paid for itself. —Lonnie E. Owens, Sr., Sr. Field Service Engineer, Capitol Air Systems.

Many end users have taken laser alignment equipment and “checked” alignments on equipment that has been running satisfactorily,  and very often with vibration data that falls well within alarm thresholds, only to find the alignment out of normal alignment tolerances. In this instance, the vibration data should be the determining factor. If the equipment is running well, leave it alone. It would however be a very good practice to keep this alignment data and use it in the future for the intentional misalignment of this particular machine. It is quite possible that the machine had in fact been deliberately misaligned when cold and stopped to compensate for positional changes that occur due to thermal growth or dynamic load shifts.

Laser shaft alignment has become ubiquitous these days. And for the most part,  alignments are very similar from one machine train to another. The user enters the RPM for tolerance evaluation, enters the dimensions of the driver, measures misalignment, and makes corrections. But what happens when an unusual physical configuration exists, as when the foot of the machine is between the flex planes of the coupling? Or the receiver cannot be mounted outboard of the flex planes of such coupling?

Entering a dimension correctly as a negative value can take care of that problem. This will ensure that the corrections at the feet are precise, and the alignment is done properly.

Does your laser alignment system have this crucial capability? Our ROTALIGN® ULTRA laser alignment system does!