Castrol Challenges Scavenge Drain Oil Analysis Methodology
Concerns over corrosive wear risk in cross-head engines led Castrol Marine to question the rigour of some widely used scavenge drain oil analysis (SDA ) techniques. Factors influencing scavenge drain oil characteristics include fuel sulphur level, cylinder oil BN level, system oil contamination and operating profile. Accuracy is critical in SDA interpretation, not least because it supports feed-rate assumptions that are critical to cylinder oil performance, Castrol said. “It is not possible to analyze results accurately without comprehensive knowledge of the fuel oil, the new and used system oil, feed rates and operational data collected from the engine at the time of sampling,” said Paul Harrold, Castrol Marine Technology Manager.
Propulsion: Optimizing Feed Rates For Crosshead Diesels
ExxonMobil introduced a program to optimize cylinder oil feed rates in low-speed (crosshead) diesel engines. The "Feed Rate Optimization" program is designed to help minimize operating expenses by analyzing scrapedown oil as a way to detect changes in the condition of an engine¹s cylinders. The program, which is designed to help customers find a balance between the cost of cylinder oil and the expense of wear-related cylinder maintenance, analyzes scrapedown oil collected from the engine’s scavenge space, a technique pioneered by ExxonMobil. It is designed to provide comprehensive laboratory testing and analysis of the oil sample, and offers onboard testing tools that enable ship’s engineers to quickly detect substantive changes in cylinder condition.
