Understanding the ISO 10816-3 Vibration Severity Chart

The ISO-10816 Vibration Severity Chart hovers above industrial machinery.

The Smart Machine Checker (SMC), and the Falcon (vibration data collector/analyzer) use Accurex™ automatic diagnostic software to determine vibration problems on rotating equipment. Accurex™ performs a first order diagnostic based on ISO 10816-3 specifications (based on overall vibration levels in velocity, in inches per second/peak, or mm/sec/rms), and a second order diagnostic based on several…

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Aligned at the Factory – Realigned in the Field

An alignment check was performed on a new pump skid that had been recently installed as part of new construction. Even though it did not have much run time there were already telltale signs of misalignment as indicated by the coupling insert dust on the base. The new pump skid came aligned from the factory. …

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Taking Care of your Spares

Rotating equipment, either in storage, or down for long periods of time, should be rotated on a regular basis. This prevents two things: rust forming in the bearings, gears, etc., due to lubricant settling into the reservoir. false brinelling, which is micro-spalling of the bearing raceways due to impacting. This occurs when vibration is present…

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Static, Couple, and Dynamic Unbalance

According to the International Organization for Standardization (ISO), unbalance is “that condition which exists in a rotor when the vibratory force or motion is imparted to bearings as a result of centrifugal forces”. In other words, unbalance is an unequal weight distribution of a rotor around its rotating centerline. The rotating centerline or rotational axis…

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Implementing a Hybrid Model to Monitor Machinery Vibration

Monitoring machinery vibration can use many tools and models, including a hybrid model. Some of the monitoring tools available today include: Portable vibration data collectors and analyzers.  Short-term surveillance vibration data collectors and analyzers (which can be installed temporarily). Embedded sensors mounted to equipment which can monitor vibration, temperatures, and other inputs. Permanently mounted accelerometers…

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A Handy Guide to Balancing Rotating Machinery

icon of a fan with a spot indicating a balancing weight.

Balancing rotating machinery is mostly math, with a bit of common sense and experience thrown in. The math is constant, so here are some tips to help with the common sense and experience part. Preparing to balance Inspect before you balance I once balanced a fan by pulling an air filter out of the fan…

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“Mic” Your Shims Before Alignment!

stack of shims

Have you ever added the number of shims your laser alignment tool or dial indicator tells you to during an alignment only to find your machine is still out of alignment? This is a frustrating but common occurrence. Was it a calculation error or did your alignment tool give you the wrong measurement? More than…

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Watch Your Grease!

In Acoem USA’s Reliable Precision Maintenance (RPM) class, we discuss several key points maintenance personnel need to know about lubrication. One of those points is grease compatibility. At a recent class, our students mentioned they only used two kinds of grease. When we asked what they were, they didn’t remember the name. So, one of…

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Using the Acoem Bearing Defender as a Lubrication Tool

Co-author, Stan Riddle. Lubricating bearings on a regular PM schedule has some inherent problems-mainly, how do you know if a bearing needs lubricating or not?  If the bearing seal is not compromised, grease should stay in the bearing, and provide lubrication for a long time.  But if the seal is blown, the bearing will require…

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Belt Drive Basics

All over the world belts provide power transmission in transportation, industrial and commercial machines. Belt drives for power transmission are classified as frictional drives. The belt transmits power by contacting the sides of the drive and driven sheaves. Belts are available in several styles: Flat belts, v-belts, Synchronous (timing) belts and Multi-ribbed belts. While belts…

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Coupling Tolerances vs. Shaft Alignment Tolerances, revisited

We have several blogs discussing the differences between coupling alignment tolerances and precision shaft alignment tolerances (see links below). As stated in those blogs the coupling manufacture’s tolerances are for the coupling. As maintenance professionals we are concerned with the coupling, however we are more concerned with the bearings in the machines. Precision shaft alignment…

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An Old Maintenance Mechanic’s Look at the Next Generation

This grainy photo was from my last day at a Weyerhaeuser mill in 1987.  I was a 26 year old millwright.  If you look closely, you’ll see an IBM computer in the storeroom.  We had another one we used for running Palomar Microlog vibration data collection.  We had a first generation laser alignment tool, but…

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Why Don’t I Input a Coupling Diameter?

We often get asked why we don’t input a coupling diameter when performing a precision shaft alignment with the ACOEM laser alignment systems. The coupling diameter (or more correctly sweep of a face dial indicator) is only required when doing a rim and face dial indicator alignment or when the user wants to know the…

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Influential Piping

There are many outside influences that affect a precision shaft alignment. One that seems to be overlooked is pipe hanger location and condition. The weight of the piping on the pump, when pipe hangers are missing or incorrectly spaced, can cause deformation of the pump housing and the base, essentially putting a strain on all…

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4 Challenges Maintenance Teams Face

Our customers come from a wide range of industries, but they share many of the same pain points in their facilities. Over the years, we’ve consulted our customers to better understand these pain points and how our technology solutions can help to alleviate them. We found the following 4 issues resonated with the majority: Lack…

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