Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

Machinery Alignment Changes!

VibrAlign
alignment image

Machinery Alignment Changes!

Skid-mounted machinery is frequently shipped and tagged as being aligned. Recently a customer of ours received eight centrifugal motor/pump sets, already mounted on steel frames. Each coupling was guarded, and on the guard was a tag, which listed the vertical and horizontal offset and angularity values.

All of the tags stated that the machines were laser aligned. The worst misalignment listed was about 3 1/2 mils of offset horizontally. So, since we normally assist our customers in perform field alignments on real machines as part of the training class, we decided to check the alignment on these new pumps. The maintenance staff was surprised to discover that seven of the eight pumps were out of alignment, some by much more than its tag stated.

Are you surprised? You shouldn’t be.

These are excellent motor/pump sets, manufactured and sold by a reputable company. And they were most likely aligned to just what their tags said – when they left the plant. But alignment can change.

alignment image

If you look closely at the photo, you can see that these skids are mounted to wooden pallets. Not exactly an inertia block! They are loaded onto trucks, and hauled over bumpy interstate highways in the back of trailers. Then they are unloaded, often stored for extended periods of time, and finally mounted in industrial settings. The motor/pump sets in the photo were actually designed to be mounted onto threaded rods, and suspended above a concrete floor.

So alignment can change between the time they leave the manufacturer and when they are commissioned. And alignment can continue to change. Concrete settles. Thermal changes in piping can effect the alignment. Metals can go through stress relief changes, especially on skids.

This is why shaft alignment should be checked on a regular basis as part of a preventive maintenance program. When companies perform alignment checks as part of their PM, the machines that do change can be identified, and realigned as needed. This will increase the life of the machine components, and help assure long and reliable operation of the machines.

Related Articles

Vibralign

If You MUST Cut a Shim…

Stan Riddle, VibrAlign When I started in maintenance, cutting shims for alignment was commonplace.  Today, there are many different sizes of…

soft foot

Take Two to Minimize Soft Foot

Author: Stan Riddle, VibrAlign There are two types of shaft misalignment – offset and angular, and there are two types of soft…

Related Whitepapers

True-turbine Design Enhances Energy Recovery and CO2 Reduction

In the oil and gas industry, hydraulic power recovery turbines (HPRTs) capture energy in hydrocrackers that would otherwise be wasted to efficiently drive a charge…

5 Steps for Reliable Packing Performance

These guidelines will help extend packing life and reduce downtime. No shortcuts should be taken if a plant wants to achieve reliable compression packing performance.…

Pressure Testing of DFT® Check Valves [Infographic]

All DFT Check Valves undergo rigorous tests to ensure they meet industry quality requirements. Check out this handy infographic to learn about their diligent testing.

Bearing Protection Best Practices

Electro Static Technology (EST, AEGIS®) guarantees that AC induction motor bearings will not fail from electrical fluting damage when AEGIS Shaft Grounding Rings have been…

Comments

Leave a Reply

Your email address will not be published. Required fields are marked *

Join the #PumpTalk Community


By submitting this form, you are consenting to receive marketing emails from: Empowering Pumps & Equipment, 2205-C 7th Street, Tuscaloosa, AL, 35401, http://www.empoweringpumps.com. You can revoke your consent to receive emails at any time by using the SafeUnsubscribe® link, found at the bottom of every email. Emails are serviced by Constant Contact