Machinery Lubrication

Machinery Lubrication March April 2019

Machinery Lubrication magazine published by Noria Corporation

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Page 56 of 85

When my wife and I started getting serious about t he f ut u re during our love-struck dating days, we began talking about what kind of family we envisioned. We both wanted a large family and for our kids to be close in age in hopes they would have a closer bond when they became adults. Fast forward a few years, and we had our first four children within five years. Little did we know that the impact of each additional child would be more of a multiplication factor than simple addition. When our youngest turned 5, we decided we wanted one more and chose to adopt a fifth child, knowing full well that life would double for us once again. Much like the multiplication factor for how quickly our home requires a deep cleaning based on the number of children we have, how clean or dirty your oil is can be deter- mined by multiplying the number of particles in the fluid, according to the cleanliness code developed by the International Organization for Standardization (ISO). Understanding the ISO Cleanliness Code To fully understand the ISO 4406 solid contaminant standard, you need to go back to the begin- ning. Surprisingly, this standard did not originate with ISO but rather the National Aerospace Standards (NAS) organization. During the 1960s, the NAS attempted to bring order to the chaos of particle counts in aircraft hydraulic fluids. e result was the creation of NAS 1638. e first version of this standard utilized an optical microscope to size solid particles. All the particles within 1 milliliter of oil would be categorized into five size ranges: 5-15 microns, 15-25 microns, 25-50 microns, 50-100 microns and greater than 100 microns. A chart was used to classify the oil's cleanliness with a range of 00 to 12, based on the number of particles in each size range. e lower the number, the cleaner the oil. Prior to this time, a coding system to quantify oil cleanliness had not been established. is method worked well and was largely accepted by industry through the 1970s and '80s. With improved particle filters, Particle Counts: What They Mean and How to Use Them "By better understanding the ISO cleanliness code, setting appropriate targets and closely monitoring your particle counts, you can determine how dirty or clean your oil is." Par ticle Counting 52 | March - April 2019 | www . Devin Jarrett | Noria Corporation BACK PAGE BASICS

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