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When craftsmen are given the task of laser alignment, quite a few assumptions are made. One very common assumption is that now that a laser system is being used, anyone can do alignment. Another is that since a laser is being used, everything is alignable. Put a laser system on an unalignable machine and you will still have an unalignable machine, only with an expensive laser alignment system attached to it. A laser alignment system does NOT guarantee that a machine is alignable!!! (Actually, all machines are ultimately alignable, if only you throw enough time and resources at them- perhaps an entirely new base or foundation is needed, and/or redoing the entire piping. The questions is, is it worth it in some cases? The point is, that just because you put a laser on a machine, that does not make it instantly alignable, vanishing all other problems.)
However, a laser alignment system, combined with a skilled and trained craftsman and a good alignment procedure, will greatly expedite alignments and help determine if a piece of equipment is alignable at all. The following is a tried and true procedure that will greatly expedite alignments.
Pre-alignment checks are critical in ensuring successful alignment. All surfaces should be clean and burr-free with metal to metal contact between the feet and shims, and the shims and base. Shim packs should be consolidated to three or four shims per foot. Jackscrews should be installed. A concentricity and runout check should also be done on the coupling and shaft. It is also a good practice to check the base for flatness.
The next step is to accomplish a rough alignment. Use whatever method that you prefer to get the machines reasonably close, or “eyeball” clean. A straightedge will work on some couplings in short-coupled machines. On machines with spacer couplings, the laser and a tape measure can be used very effectively. The purpose of this step is to remove gross misalignment and ensure that the laser and detector are in line enough to take readings. (Note that the best laser systems offer range extension so even rough alignment can easily be done with the laser.)
After your rough alignment has been accomplished, a rough soft foot check is in order. Eliminate any obvious rocking and fill any obvious gaps. This should be done with all hold-down bolts loose. Now it is time to use your laser alignment system. Make sure that all required dimensions are entered accurately and that initial alignment measurements are repeatable. Assuming you still have a rough alignment, a final soft foot check is in order. Follow your laser system’s recommendations for this. The ROTALIGN ULTRA even features a comprehensive soft foot wizard that guides you through the entire process, diagnoses the condition and suggests a solution. After any corrections are made, retighten all hold-down bolts, then recheck each foot individually with all the others tight. We recommend a tolerance of 2.0 mils or less. Now for the final alignment: The first correction that should be made is getting the vertical plane in tolerance. When making shim corrections, monitor the horizontal plane to make sure your machine does not move laterally too much. Once you are satisfied the vertical alignment is in tolerance, proceed to final horizontal corrections. Leave the hold-down bolts snug (not tight). They do not need to be all the way loose to make effective horizontal moves. This is where good jackscrews become invaluable, Try to avoid hitting machines with hammers. When machine is within tolerance alignment is complete. Save the alignment file for documentation and future reference.
Many years of involvement with machinery alignment reveal that this is the best and fastest procedure for precision alignment. Each step is necessary and important in accomplishing the next step. Take your time and be diligent and you will succeed in your alignment.

by Ana Maria Delgado, CRL

Cardan Shaft Alignment

May 2011 • MAINTENANCE TECHNOLOGY

Cardan Shaft Alignment: These applications aren’t as straightforward as others. Their special considerations call for special tools and approaches.

A cardan shaft is, in the simplest terms, a spacer shaft with a universal joint coupling on each end. (Its name comes from a 16th-century Italian mathematician, Girolamo Cardano.) This type of arrangement allows power to be transferred between two machines that are offset from each other.
Widely used in industry, cardan shafts have proven practical on applications where space is limited—as well as in situations where an element in the machine train (e.g. paper roll) may need to be actuated (dynamically positioned) to an alternate position when the machines are not running. The universal joint allows for limited movement without uncoupling. To ensure sufficient lubrication circulation, which in turn prevents the universal joints from seizing, cardan shafts are normally installed with an angle from 4 to 6 degrees at the universal joints. Experience, though, has shown that the angle between the shafts of the driver and driven unit should be kept to a minimum, preferably less than 4.36 mrads (0.25 degrees). Ideally, the angles between the driver and driven shafts and the cardan shaft, shown as ?1 and ?2 in Fig. 1, would be equal. Geometrically, this would equate to zero angularity existing between the driver and driven unit: In other words, the shafts of the driver and driven machine would be parallel to each other.
Read entire article Cardan Shaft Alignment featuring the ROTALIGN ULTRA laser alignment tool suited for cardan-shaft applications.

by Ana Maria Delgado, CRL

Tolerances For Shaft AlignmentSome coupling manufacturers will sell couplings claiming that the coupling can take shaft misalignment. While this is true for most flexible couplings, it can be easily misinterpreted. Flexible couplings are designed to withstand, without damage, some shaft misalignment. Sometimes it is perceived that, since the coupling can take the misalignment, the machines can run under this condition without any consequences. When running machinery with significant shaft misalignment, bearing and seal life may decrease immensely, and other damage result. Therefore, for longer machinery life, it is always recommended to have equipment laser aligned to standard industry tolerances for shaft alignment, and not to the looser alignment tolerances allowed by the coupling itself.

by Adam Stredel CRL


As the Project Manager for the Millwright Competition and a member of the 2011 ABC Craft Championship Committee, I want to thank you and your company for your support for the Millwright competition.
           
Even though I have never used that particular laser, it was very easy to use and only took about five minutes to become very comfortable with it. None of the competitors had used the SHAFTALIGN prior to the competition, which was great. It only took about twenty minutes to show them how it operated, including thermal growth, soft foot, and static feet selection. Even though the competition required an 1800 rpm alignment with thermal growth, one of the competitors did a 7200 rpm alignment within the time limitation, which would never have been achievable with dial indicators.
 
I am proud to say that with your help and equipment this competition has finally evolved into a modern competition. Your alignment equipment is easy to install, easy to use, and accurate. It is the best alignment equipment that I have ever seen.
           
Again thank you for your support.
 
Ed LePage
Mechanical Craft Training Coordinator
CIANBRO Institute
Congratulations to Joseph Ducharme, first place winner.

by Ana Maria Delgado, CRL

A black liquor pump-gearbox-motor train in a paper mill in the Southern US, was found bolt-bound at the motor’s outboard feet.
After measuring the misalignment at both couplings between pump and gearbox, and gearbox and motor, the OPTALIGN SMART revealed a large 155 thousandths move required, at the motor’s outboard feet. This move could not be made (see Fig. 1).

Figure 1

Using the OPTALIGN SMART’s Static Feet function which allows the user to select any 2 pairs of feet as “static” (as opposed to some other alignment tools, which only allow the user to select an entire machine to be stationary, not individual pairs of feet), we selected both the pump and motor outboard feet to be “static”, which means that no move will be made at these points.  This means the OPTALIGN SMART automatically selects a ‘new alignment line’ that connects both outboard feet of the train and the moves will be carried out on the machines’ other feet to align to this new alignment line.  Fig. 2 reveals that now the biggest move to be made was only 53 thousandths.
Figure 2

This was easily achieved with the OPTALIGN SMART laser shaft alignmen tool… Problem Solved!

by Pedro Casanova CRL

March 2011 • IMPO MAGAZINE, iPurchase Supplement
As the American economy recovers, how aware, or active, are manufacturers concerning predictive maintenance?
Most manufacturers never lost the desire to increase their overall reliability and predictive maintenance efforts during the recent economic slowdown.  Some companies did postpone purchases of predictive maintenance related products.  However, a lot of companies realize that an investment in predictive maintenance technologies is a viable means to decrease overall maintenance expenses, so they do it the right way.  A lot of manufacturers, as a result of this understanding, continued to invest into predictive maintenance related technologies during the recent economic slowdown.  This allowed them to reduce overall maintenance costs and place their company in a more competitive position once the economy recovers. Interest in these products is higher this year as companies continue to invest in vibration- and alignment-related products to reduce their costs. increase competitive advantages, and manufacture equipment reliability.
Read entire interview Q&A Roundtable from iPurchase, a supplement from IMPO Magazine including:
Are there any interesting trends occurring in the maintenance market?
Why do you think laser alignment is important to a manufacturer’s maintenance strategy?
How would you recommend a manufacturer approach the creation of a more robust maintenance plan?

by Trent Phillips

Laser alignment is an essential component of a proactive maintenance strategy for rotating machines. This practical guide provides information and guidelines for the implementation of good shaft alignment of directly coupled rotating equipment including terminology, alignment methods, troubleshooting soft foot, causes of machine breakdown and related case studies.
Download your complimentary copy now!

by Ana Maria Delgado, CRL

WaterWorld Magazine • February 2011
A Florida water treatment plant recently discovered that having full-flex (double engagement) gear couplings at either end of a spacer shaft connecting a Lufkin gearbox to a 13, 000 gpm Worthington water pump caused self-exacerbating vibration that eventually destroyed the gearbox twice within 3 months, requiring a full rebuild each time.After the second rebuild and re-installation, LUDECA was called in to monitor positional changes between the stopped and running conditions of the entire diesel engine-driven machine train with its PERMALIGN system to derive true target specifications for the “cold” condition. Thereafter, a laser re-alignment to exact tolerances would be performed to the new targets…
Read entire case study and view photos

by Alan Luedeking CRL CMRP

Mario Rostran, LUDECA Sales Engineer, introduces the OPTALIGN SMART shaft alignment system. Mario then speaks with Nihal Raval, a maintenance reliability engineer from SOLUTIA Inc., about how OPTALIGN SMART helped him.

by Ana Maria Delgado, CRL


Exhaust fan
Photo courtesy of Martek Biosciences

Problem: Exhaust fans
The exhaust fans at two of our process buildings kept having the same common faults (failed bearings, failed motors and running hot.). We spent over $4, 400.00 on one fan from 2008 to 2010 and over $5, 600.00 on the other fan on parts alone.
Solution: Purchased an OPTALIGN SMART EX laser alignment system
In July 2010, we received our new OPTALIGN SMART EX and had LUDECA come in and give us an introduction introductory training course. After a few trials on using the laser alignment tool on a motor and pump that we set up in the shop, we were ready to take it out in the field. We went and set the tool up on our two exhaust fans and found out there were way out of alignment. After a few tries we had smiley faces on both machines in the horizontal and vertical directions. Since the alignment, we haven’t had any more problems with either fan. The OPTALIGN SMART EX is very user friendly and well worth the money. Now we have incorporated the OPTALIGN SMART into to our PM program to check the alignment on all rotating equipment as they come up for a PM. In the last few months we have been using it, we are getting good feedback from the maintenance department on how easy it is to use and how much time is saved, instead of doing it the old way (dial indicators).
Bryan Brown
PM Technician
MARTEK Biosciences
Kingstree, SC

by Ana Maria Delgado, CRL

Before going on a trip, we typically plan ahead, what we’re doing and where we are going each day on the trip, and we pack accordingly. When starting an alignment job, it is not that different. Whether it means to thoroughly clean the mounting base, having the right tools for the job, or allocating the right amount of hours, preparation can go a long way. Cleaning underneath the feet of the machinery will greatly decrease chances of having a soft foot, thus increasing the machine’s ability to respond accurately to corrections. Also check under entire machine for loose debris. This might cause soft foot as the machine comes down during alignment corrections, even though the feet of the machine are spotless. Other things that should be considered during pre-alignment, is to have the right set of shims. These must be the right size for your application, corrosion proof and made from a high strength material. They should also be free from burrs, bumps, nicks, and dents of any kind.Of course, tagging out/locking out the power of the machinery is the VERY first step before starting the alignment process. Having trained personnel can also cut down the hours it takes to perform the alignment.
Follow this link for a pre-alignment preparation checklist.

by Adam Stredel CRL

  1. Functionality: Do the Predictive Maintenance (PdM) tools you are considering have the ability to make all the measurements required by your physical asset management strategy? Are displays easy-to-see and interpret? Are the tools easy-to-learn and easy-to-use? Learn about our PdM tools.For Software, can it interface with your CMMS system? Can you import data from other systems such as oil data? Learn about our OMNITREND software.
  2. Durability: Will the tools hold up to your plant’s environment? Are they rugged enough for multiple users? IP ratings such as water–, dust– and shockproof are very important when dealing with industrial tools.
  3. Service: Will your vendor be available to answer questions or address problems should they arise? What is the vendor’s reputation for customer service? If you have a problem with a tool how soon can you expect a “loaner” until yours is repaired? Are the tools repaired and/or calibrated locally? Learn about LUDECA Repair and Calibration.
  4. Training: What are the training costs associated with learning how to use the tools? Is training included with the purchase? What training resources are available? Learn about LUDECA Training.
  5. Support: What level of support do you need? Does the vendor have a call-in tech support center, is it free or paid? Will the yearly costs of maintenance agreements make the tools considerably more expensive than competitor’s tools having similar capabilities? Do they offer free updates? Learn about LUDECA Technical Support.

by Bill Hillman CMRP

Measure Twice, Cut Once!

Pumps & Systems • January 2011
Aligning an electric motor coupled to a large air blower required multiple measurements.
Around 18 years ago, a client needed assistance aligning an electric motor (more than 1, 000 horsepower) coupled to a large air blower. This was a critical piece of equipment that was routinely shut down for preventive maintenance at regular intervals to ensure trouble free operation. The mechanical contractor used for this alignment was reputable, and the customer had used him several times in the past for this task with satisfactory results.
Vibration Problems
Upon start up, vibration levels were so high that the package tripped and shut down before reaching full rpm, preventing any meaningful collection of vibration data to help identify the problem. This continued for two days. Convinced that the problem was alignment related, the contractor made multiple corrections with the same results. Every time the package was started, vibration levels were high, and the package shut down before reaching full rpm.
Laser Shaft Alignment Assessment
The client requested that a shaft laser alignment system be used to ensure correct alignment. The motor and the blower were uncoupled, and all the hold down bolts were at spec. Initial readings were taken. Remember, this was more than 18 years ago, so the alignment system was a much less sophisticated system than those available today.
Read entire article Measure Twice, Cut Once!

by Dennis Onken

Machinery Lubrication, September • October 2010
In his book “Machinery Vibration: Alignment”, noted author and expert on precision alignment Victor Wowk illustrates the relationship between misalignment and loss of machine life. Of course, some equipment is more or less tolerant to misalignment depending on bearing type and coupling type. Likewise, the effects of misalignment are magnified as a function of speed.
Read entire article Shaft Alignment has a Bearing on Lubrication Excellence

by Ana Maria Delgado, CRL

Measure vibration overall levelsThe ROTALIGN ULTRA VIBRATION ACCEPTANCE CHECK works in combination with the VIBTOOL vibration meter to measure vibration level according to ISO 10816-3 international standard. The RMS velocity value is wirelessly transferred and stored back onto ROTALIGN ULTRA computer where the result is instantly evaluated against the machine classification threshold. This fulfills the recommendation of the acceptance check after installation of rotating machinery or any alignment job, ensuring that machines run without restrictions.The VIBTOOL vibration meter can measure the following parameters: Vibration Severity, Bearing Condition, Temperature, RPM and Pump Cavitation.More information about the new ROTALIGN ULTRA VIBRATION ACCEPTANCE CHECK

by Ana Maria Delgado, CRL

Turbine-Generator Alignment

POWER-GEN Worldwide, September 2010
The alignment of turbine-generator sets poses unique challenges that only the best laser shaft alignment systems can overcome. Not the least of these is the difficulty of turning the shafts (either coupled or uncoupled) and the methods employed in turning them. The intent of this article is to present a few of these challenges and the solutions to them.Turbine Generator Alignment
Shaft Rotation
Since a turbine-generator train cannot be readily rotated by hand (unlike most other smaller machine sets), external “helper” forces must be enlisted, such as an overhead crane with a sling around the shaft or coupling. As the crane applies rotational force it also lifts the shafts in the bearings a little, changing their relative alignment and true position in the bearings. This makes using the Continuous Sweep measure mode impractical, since you do not want to corrupt the validity of the alignment data you are collecting as you rotate the shafts. The same concerns also apply to other methods, such as the chainfall and pin method…
Read entire article Turbine-Generator Alignment featuring the Rotalign Ultra laser shaft alignment system

by Ana Maria Delgado, CRL

Reliable Plant, August 2010
Traditionally, plumbness measurements on a vertical hydro-turbine/generator shaft involved stringing a series of wires along the length of the shaft, attaching a weight to the end of the wires and then measuring the space from the wire to the shaft using an electronic micrometer. Although this method was inexpensive and has been used for many years, it did require access to a long length of the shaft to achieve an accurate resolution. Also, measurements involve physically measuring the distance between the wire and the shaft at various elevations on the shaft, increasing the amount of time and personnel requirement for the measurement.Ludeca Inc. presents its experience with a laser-based system which replaces the time-consuming wire method. Measurements now can be performed in a fraction of the time it would otherwise take with the wire measurement method. Ludeca’s measurement system, known as the PERMAPLUMB, uses a self-adjusting mechanical mirror, always plumb to earth, that reflects a Class 1 laser beam into a detector. It requires only 14 inches of axial space along the shaft. The mirror and transducer are attached by a bracket that uses magnets on the turbine shaft. From a single 270-degree shaft rotation, the system calculates and displays angularity and corrective moves and provides a statistical quality measurement of the data. A “move” function allows monitoring of corrections as they are being made. The resolution is better than 0.00002 inch per foot, which is more accurate than required by NEMA. Adjacent turbines also can continue to operate since the system is insensitive to vibration.
Read our article: How to achieve vertical shaft plumbness using laser alignment

by Daus Studenberg CRL

July 2010 · IMPO Magazine
“You must be the change you wish to see in the world.” — Mahatma Gandhi
Investing in more efficient process machinery makes good business sense and will help to ensure reduced costs plus a greener plant. However, not all plants can afford to replace their present equipment with newer, more efficient machines. What steps can these plants take to “green up” their business and operate more efficiently? Most plants can vastly improve machine reliability, efficiency, and reduce raw materials conversion costs by simply making improvements in their present machinery. This can be done through precision maintenance practices and defect elimination. A good PdM (predictive maintenance) process will help to achieve these goals.
Read entire article: Save Some Green: Green Up Your Machines

by Ana Maria Delgado, CRL

Problem: Our boiler feed water pump running on steam turbine kept failing numerous mechanical seals since 2006, and gave us very poor reliability. Due to the unreliable nature of the steam turbine, we had to keep running our electric boiler feed water pump as a primary pump. This cost us $$$ in terms of energy usage, as we were not able to use steam generated by our boiler to power the steam turbine pump.

Solutia Laser Shaft Alignment
Photo courtesy of Solutia.

Solution: In February 2010, we ordered a new rotating assembly for the steam turbine pump and installed it. We also purchased a new laser shaft alignment system “OPTALIGN SMART”. We had stopped laser aligning our equipment for the last couple of years due to the old laser alignment system not being calibrated and not being very user friendly. After seeing a hands-on demonstration of the OPTALIGN SMART, our skilled trade group was convinced that we needed this new user friendly system for laser shaft alignments.Upon laser aligning the steam turbine, we found that we were way off in both Horizontal and Vertical alignment. Using the OPTALIGN SMART, we were able to achieve a much better alignment than we ever did. We did not get the “smiley” faces on our alignment, but that was due to having tremendous amount of pipe strain, poor base condition and being bolt-bound. However, our steam turbine has been running smoothly without any issues since February 2010. According to some operators, the steam turbine has never run this quiet and long in the past.We have started using the OPTALIGN SMART laser shaft alignment tool on all our rotating equipment, and already seen some really good results and overall cost savings in maintenance labor and materials.
Nihal Raval
Maintenance/Reliability Engineer
SOLUTIA

by Ana Maria Delgado, CRL

The biggest contribution one can make to lower the operating costs of rotating systems is to align them correctly using the real coupling target values. Target values recommended by manufacturers do not always reflect the real machine centerline movements due to thermal growth, pipe strain and dynamic factors. The new ROTALIGN ULTRA Live Trend, a short term continuous monitoring application, helps to exactly determine the relative positional changes between coupled machines during start-up or shut-down. By applying these values, the machines are precisely aligned to reflect normal operating conditions. In addition, Live Trend allows you to establish a trend of the events that influenced such positional changes. With Live Trend you can also monitor pipe growth and any other machine components over time.

Measure machinery positional change
Rotalign Ultra Live Trend Results - Live
Measure machinery positional change
Rotalign Ultra Live Trend Results - Plot

This means:
  • Lower energy costs through reduced power consumption
  • Increased mechanical life of bearings, seals, shafts and couplings
  • Reduced bearing and coupling temperatures
  • Minimized breaking or cracking of shafts
  • Reduced vibration
  • Reduced machine damage

Reliability starts with precision shaft alignment!

by Ana Maria Delgado, CRL

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