Machinery Lubrication magazine published by Noria Corporation
Issue link: https://www.e-digitaleditions.com/i/431954
Implementing a predictive maintenance program that includes analyzing the in-service coolant has proven to optimize reliability, decrease unscheduled downtime, reduce in-service failures and field repairs, establish proper coolant drain intervals, increase component lifespans and control equipment costs. Conventional vs. Extended-life Coolants Coolant analysis is recommended for both conventional and extended-life coolants. Fluid design cannot prevent or correct the mechanical issues or chemical reactions that impact cooling system performance. Air and combustion gas leaks, localized over- heating, hot spots or electrolysis can chemically alter or destroy the coolant and its inhibitors. Changes in coolant composi- tion may cause chemical reactions that can damage metals and result in premature component failure. Mechanical problems and chemical reactions affect conventional and extended-life coolants equally, and neither fluid formulation can correct the root cause of a mechanical problem. Inhibitor and glycol levels should be analyzed regularly not only to ensure adequate system protection but also to iden- tif y any mechanical issue or chemical reaction that could result in catastrophic engine or component failure. An effective fluid analysis program should address the four primary goals of coolant analysis: preventive maintenance, predictive maintenance, root cause analysis and life- cycle management. Preventive Maintenance Small problems with the coolant or cooling system can become catastrophic component or system failures if left unchecked. Regular coolant testing and analysis can determine: • If the coolant is suitable for continued use or needs to be replenished or replaced (a laboratory can identify proper fluid change recommendations). • If coolant mixing has occurred. • If contaminants are present that can cause the formation of scale or acids. • If additive depletion is compromising metal protection. Predictive Maintenance Coolant analysis can help in predicting impending failures by noting abnormalities and trends in test results. Trends can pinpoint mechanical and formulation concerns that may jeopardize the life and longevity of the system and its components. These issues often involve the formation of acids and scale, contamination ingression, electrical ground problems and localized overheating or hot spots. Root Cause Analysis When an engine or cooling system component failure does occur, coolant analysis at the proper intervals can identify the root cause of the problem, such as a blown head gasket, electrolysis, a blocked ML www.machinerylubrication.com | November - December 2014 | 41