Posts Tagged ‘soft foot’
Composite Pump Base?
We have written numerous blogs on pump bases, they still at times contribute to precision shaft alignment challenges. A recent class at a wastewater treatment plant, was having difficulty controlling soft foot on several different pump skids with composite bases. Previous blogs have described how a bad base can contribute to soft foot. In this…Read More
Don’t Be Tempted!
Often the OJT portion of our training classes begins with an alignment check of a rotating piece of machinery in the client’s facility. This comes after numerous alignments in the classroom, on the training fixtures, performed by the attendees. They are then ready to apply their skills learned on the classroom training equipment in their…Read More
Thinking Outside the Alignment Box on Flexible Bases
Here is another example of the complexity of completing a precision shaft alignment on a flexible base. Some industries use pump skids that are moved to different areas of a plant for various reasons. Whether they exist to save money, allow for quick removal or process changes, the flexibility of these types of…Read More
The Importance of Mechanical Skills in the Data Center: Precision Shaft Alignment
Knowing how to perform a precision shaft alignment is important when it comes to maintenance skills. Whether you are using dial indicators or a laser alignment tool (if you are in the market for either, we have several options here), being able to achieve an accurate, repeatable alignment is key. A few reminders: The…Read More
Here are the Top Maintenance Tips from VibrAlign Experts
As you may have noticed if you follow VibrAlign’s social media accounts, we have been going through “Maintenance Tip Mondays” for the past couple months. This is a fun opportunity to hear from our experienced technical trainers as they share the top tips and tricks they have learned over the years in the field and…Read More
3 Common Reasons for Shaft Alignment Frustrations
Achieving a perfect alignment can seem daunting at times, but it doesn’t have to be if you have the right tools and if you know to look out for three common reasons for shaft alignment frustrations. Once you know these three factors, you can take the necessary steps to avoid them and/or correct them. The…Read More
Are Shims Causing a Soft Foot Issue?
One of the many things I love about my job is the numerous challenges we face during the field alignment portion of our Precision Shaft Alignment Training. Prior to the training, there were some repeatability issues when attempting to perform a precision alignment on this piece of equipment. One of the main causes of non-repeatability…Read More
You Can’t Perform Precision Alignment on Un-precise “Stuff”!
Alan Garbers with Johnson Controls International contacted me regarding an alignment problem, and asked for my advice. Here is a condensed version of his email. A client rents portable chillers, and related equipment. They built a 125HP portable pump skid with a Bell & Gossett pump on a VFD. I was there to commission the…Read More
Channel Strut as a Motor Sub-base?
At first thought it may sound like a good idea as the specialized fasteners in the channel make it easy to tighten the motor hold down bolts, however in reality it’s a cause for precision shaft alignment issues. Here’s why. A good pump/motor base is engineered to meet specific standards (IE: ANSI, API, etc.) with…Read More
Challenging, But Not Impossible!
As we trainers travel around the country conducting precision shaft alignment training, we often run into some fairly harsh work environments during the field portion of the training. At times the equipment that needs to be aligned is caked in product from spills or leaks. This can create a significant challenge when attempting a precision…Read More
Should Soft Foot Be Corrected in Centrifugal Pumps?
In a previous blog I wrote in Jan of 2016 “Soft Foot Concerns in the Stationary Machine?” soft foot in the pump was causing repeatability issues during a precision shaft alignment. https://acoem.us/other-topics/soft-foot-concerns-stationary-machine/ Soft foot can also distort the pump casing which can change clearances within the casing. This can shorten the life of the…Read More
The Soft Foot Primer (Part 3) How to REALLY Minimize Soft Foot Every Time
It is both possible, and desirable, to minimize the negative effects of soft foot. While it may be difficult to completely get rid of soft foot, it can typically be reduced to a few mils, if the following techniques are used. PREPARATION AND CLEANLINESS CLEAN! If you remove the motor, wipe the feet clean, before…Read More
The Soft Foot Primer (Part 2) Vibration and Alignment Problems Related to Soft Foot
Most industrial maintenance mechanics who are involved with precision shaft alignment are familiar with the phenomenon of soft foot. From an alignment standpoint, soft foot causes: Changes in alignment values, between when the hold down bolts are loose, and when they are tight. Non-repeatability in alignment measurements, especially if the bolts are not tightened in…Read More
The Soft Foot Primer (Part 1) Are You Measuring Soft Foot, or Just Its Effect?
Most laser alignment tools include a soft foot function. However, in truth these tools haven’t measured ACTUAL soft foot, instead they have measured the EFFECT of soft foot at the shaft or coupling as that is where the laser heads or sensors are mounted. While the EFFECT of soft foot is important, correcting the ACTUAL…Read More
Soft Foot! Or Are You Just Pulling My Leg?
It’s no joke that many machines operate with high levels of vibration due to soft foot. These same machines often have a decreased life span due to this condition. Soft foot is a condition that should be eliminated during the precision shaft alignment process, if you’re performing proper alignments at all. This condition can manifest…Read More