What are the testing standards for steam turbine lubricating oil?
2 Answers
The following are the standards for steam turbine lubricating oil: 1. In China, the standardized steam turbine lubricating oils include L-TSA (anti-oxidation and anti-rust) steam turbine lubricating oil, with the standard GB11120-89; 2. Anti-ammonia steam turbine lubricating oil, with the standard SH0362-92; and rust-proof steam turbine lubricating oil for naval use, with the national military standard GJB1601A-98. The following are the essential requirements for steam turbine lubricating oil: 1. Good oxidation stability; 2. Appropriate viscosity and good viscosity-temperature characteristics; 3. Good demulsibility; 4. Good rust and corrosion prevention; 5. Good foam resistance and air release properties.
Having worked in steam turbine maintenance for so many years, oil testing standards are absolutely crucial. Every time we take samples for oil testing, we must check if the viscosity is stable—too high or too low is unacceptable, as it can easily affect rotor operation. Acidity must also be measured to see if it exceeds limits; excessive acidity can sour the oil and corrode equipment components. Moisture is a common issue—water in the oil causes emulsification, which may lead to shutdowns. Metal particle analysis can detect signs of bearing wear and prevent major overhauls. The standards mainly refer to international regulations like ISO 4406 or ASTM D4378, which specify that the acid value should not exceed 0.2, and viscosity must stay within defined limits for safety. It’s recommended to send samples for testing monthly—don’t wait until equipment alarms trigger action. Regularly train colleagues on proper sampling to ensure reliable data. Oil change timing should also be based on test reports, saving costs and extending equipment lifespan.
