What is the vibration standard for a 3000 rpm steam turbine?
2 Answers
For a steam turbine operating at 3000 rpm, a double amplitude vibration below 25um is considered good, while below 50um is acceptable. Consistency in vibration measurement positions is required: The standard specifies vibration measurements in three directions of the bearing: vertical, horizontal, and axial. During vibration measurements, the position for each measurement must remain consistent; otherwise, significant measurement errors may occur. Vibration amplitudes in all three directions must not exceed specified values: If the vibration amplitude in any of the three directions exceeds the specified value, the vibration condition of the unit is deemed unacceptable, and measures should be taken to eliminate the vibration. Critical speed vibration should not exceed 100um: Emergency stop measures also stipulate that if the vibration suddenly increases by 50um during operation, the turbine should be tripped immediately. Additionally, the maximum vibration at critical speed should not exceed 100um.
As someone long engaged in industrial equipment maintenance, I frequently deal with vibration issues in 3000 RPM steam turbines. Vibration standards are critically important - normal operation requires keeping vibrations within 0.05mm according to ISO specifications. Exceeding 0.07mm warrants immediate attention, as this may indicate rotor imbalance or shaft misalignment, potentially leading to accelerated component wear or even shutdown incidents. We typically use displacement sensors for measurement. Excessive vibration not only reduces equipment lifespan but also decreases overall efficiency. Standards aren't absolute - they vary by specific machine model and operating conditions, with older equipment sometimes allowed slightly higher tolerances. Regular inspection and maintenance are essential; neglecting them only increases repair costs and risks. Remember, these limits derive from extensive engineering practice to ensure safe, efficient operation.
