The turbine vibration increased suddenly, then returned to normal
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Please, experts, help analyze the reason. What are the reasons for this situation?
It is possible for particles to enter the steam pipeline and reach the turbine, where they collide with the rotor during its operation. Larger impurities may cause frictional collisions inside the turbine or be expelled from it; this can lead to vibrations in the turbine rotor. Although these vibrations may later return to normal, damage has already occurred in certain parts of the rotor. It is recommended to inspect the turbine carefully during the next major maintenance session to determine the cause.
Analyze the oil sample to check the water content
1. Lubricant temperature has an impact. 2. Steam quality has an impact
Could it be the effect of oil film oscillation?
Let the instrument do a check first; it’s possible that the probe isn’t properly secured or is worn, but not broken. If there are no issues, check whether there have been any changes in operating conditions, as well as any significant fluctuations in steam volume and pressure.
1 Determine whether it is a true value; 2 check if there are any changes in operating conditions; 3 if it is a true value, analyze the changes in the spectrum; 4 for turbines, such vibration trends are usually caused by static and dynamic friction, as well as dynamic imbalance!
1 First, check whether the vibration probe is loose. 2 Next, check if the wiring from the probe to the pre-amplifier is loose. 3 Based on the curve graph you provided, it seems that the issue is caused by jumps in signal; it is recommended that you install a quality filtering module.