Machinery Lubrication

Machinery Lubrication November-December 2017

Machinery Lubrication magazine published by Noria Corporation

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www . machinerylubrication.com | November - December 2017 | 5 ML SVOC Alternatives Fully purging a system of oil can be a difficult challenge. is is espe- cially true with completely flooded lines and system components. e procedure may require partitioning the system, followed by breaking into lines in low zones to drain used oil and aided by air vents in higher zones. ere are a couple of alternatives to consider based on the machine, the operating conditions and the need for an FVOC. ese include the following (see also the table in Figure 2): Bleed-and-Feed is type of oil change normally can be performed on the run for stationary equipment without the loss of machine runtime. e process involves the progressive draining of tank oil and the addition of an equal amount of new oil, all while the oil remains circulating. For heavily degraded lube oil, it may take the equivalent of three or four oil changes (in new oil volume) to achieve the target level of oil quality and performance. Double Oil Change is will require a machine stop- page. e tank is drained and refilled in the same manner as with a normal SVOC. e oil is then brought back to operating temperature while circulating. Afterward, the oil tank is drained and refilled again. SVOC Followed by a Line Purge After the tank has been drained and refilled with new oil, the auxil- iary pump is started and the new oil is pushed into the system. e old oil is not returned to the tank but rather diverted to waste until most of the old line oil has been discharged. e tank is then refilled to the correct level, and the return line is reconnected to the tank. Alternate procedures can achieve similar results depending on the machine/system involved. Role of Oil Analysis Oil ana lysis and Inspection 2.0 ca n substa ntia lly improve the outcome of SVOCs and miti- gate the risks. is is largely the practice of carefully monitoring the aging health of the used oil and recognizing the sudden and escalating presence of a problem. Issues might include premature oil oxidation, the need for dehydration or portable filtration, rising varnish potential, the need for additive reconstruction and abnormal ghost rider concentration. For large and critical systems, the timing of the oil change is key. e best way to ensure good timing is to allow the oil to talk to you through effective oil analysis and inspection. When done correctly, these methods will enable you to achieve optimum results. ML About the Author Jim Fitch has a wealth of "in the trenches" experience in lubri- cation, oil analysis, tribology and machinery failure investigations. Over the past two decades, he has presented hundreds of courses on these subjects. Jim has also published more than 200 technical articles, papers and publications. He serves as a U.S. delegate to the ISO tribology and oil analysis working group. Since 2002, he has been the director and a board member of the International Council for Machinery Lubrication. He is the CEO and a co-founder of Noria Corporation. Contact Jim at jfitch@noria.com.

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