A
There is 2MW backpressure steam turbine that I worked with before.
Previous major inspection during overhaul, revealed turbine thrust bearing pads inactive side experienced significant thrust load. While active side pads were fine.
This was not a surprise to me. Since the thrust probes (2 of them) keep showing us the rotor axial movement was loaded to inactive side. Both probes shown the same data.
During the major inspection, we checked the thrust pads at active side, still like new appearance, as if that very very minimum load or almost nothing.
However, when we looked at inactive side thrust pads, oil lacquering was observed on all pads of inactive side. To me it can be said the load was significantly high and heat generated can be said on high side (but we don't have PT100 installed on this package). So I can't tell you what were the temperatures...
Now, it started again. Same symptom, proximity probes (axial) showing the same reading after the major overhaul.
After 24 months,the axial probes read high-high trip. Machine shutdown and same findings. inactive pads experienced same conditions.
Why this rotor move to inactive side?
What is/are can be checked to support/explain this?
Previous major inspection during overhaul, revealed turbine thrust bearing pads inactive side experienced significant thrust load. While active side pads were fine.
This was not a surprise to me. Since the thrust probes (2 of them) keep showing us the rotor axial movement was loaded to inactive side. Both probes shown the same data.
During the major inspection, we checked the thrust pads at active side, still like new appearance, as if that very very minimum load or almost nothing.
However, when we looked at inactive side thrust pads, oil lacquering was observed on all pads of inactive side. To me it can be said the load was significantly high and heat generated can be said on high side (but we don't have PT100 installed on this package). So I can't tell you what were the temperatures...
Now, it started again. Same symptom, proximity probes (axial) showing the same reading after the major overhaul.
After 24 months,the axial probes read high-high trip. Machine shutdown and same findings. inactive pads experienced same conditions.
Why this rotor move to inactive side?
What is/are can be checked to support/explain this?