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On 31st August we shutdown the plant because of a planned outage of Gas for 4 days. Gas Turbine was given a shutdown command and was then put to cool down mode normally. Turbine was kept on turning (100~112 RPM) till the morning of September 3. At that time, wheelspace temperatures were well before 100C.
On September 3, we planned to do the offline washing and for that we had to put the turbine to 0 speed. The offline washing command was given but starting motor did not take the command. All the permissives were checked but starting motor did not take any command.
Again cool down sequence was selected and instead of washing, we tried to put the turbine on turning again.
Now here are the findings. Test gauge was installed on torque converter and its pressure is normal (16 bar). A jaw type fixture was installed on turbine coupling in aux compartment and turbine was tried to rotate with hydraulic jack and it was turning normally. Again starting command was given to motor and it was not able to break the torque.
Turbine was then put to turning but giving the starting command by apply the force with hydraulic jack at the same time. Turbine was kept at turning for 6 hours and was stopped again and tried to put on turning again without jack but again same alarm appeared that turbine shaft failed to break away.
Now the problem is, starting command is given, Starting motor run for 50 seconds and turbine shaft failed to break away. We have checked different possible things but did not find any problem. Can you please guide what should we check?
I have all the details and we have checked different things. Its just I am not sure what details to be posted at the moment. Please let me know if you need another detail to troubleshoot the problem.
On September 3, we planned to do the offline washing and for that we had to put the turbine to 0 speed. The offline washing command was given but starting motor did not take the command. All the permissives were checked but starting motor did not take any command.
Again cool down sequence was selected and instead of washing, we tried to put the turbine on turning again.
Now here are the findings. Test gauge was installed on torque converter and its pressure is normal (16 bar). A jaw type fixture was installed on turbine coupling in aux compartment and turbine was tried to rotate with hydraulic jack and it was turning normally. Again starting command was given to motor and it was not able to break the torque.
Turbine was then put to turning but giving the starting command by apply the force with hydraulic jack at the same time. Turbine was kept at turning for 6 hours and was stopped again and tried to put on turning again without jack but again same alarm appeared that turbine shaft failed to break away.
Now the problem is, starting command is given, Starting motor run for 50 seconds and turbine shaft failed to break away. We have checked different possible things but did not find any problem. Can you please guide what should we check?
I have all the details and we have checked different things. Its just I am not sure what details to be posted at the moment. Please let me know if you need another detail to troubleshoot the problem.