Varnish deposits from steam turbine oils: Use of Group II oils is trending up, but formulating the correct additive package is essential

摘要

DURING THE LAST 10 YEARS, changes in steam turbine operating conditions and oil formulations have caused a variety of problems for steam turbine operators. Research by turbine manufacturers, power companies and oil suppliers has shown the main causes of the problems to be an increased use of API Group II base oils in turbine oils, combined with an increase in steam turbine peaking operation. The highest profile problems were entrained air and foam, decreased demulsibility and formation of varnish.