Questions regarding the steam turbine coasting time recording?
Thread Content
The recycle hydrogen compressor in the hydrocracking unit is equipped with a Hangzhou Steam Turbine of the back-pressure type. However, since the plant began operation, the turbine has stopped operating many times, and no records of the coasting time have been kept. Is it necessary to record this time? What is the purpose of recording the idling time, besides detecting any abnormalities in the impeller and bearings?
Just keeping a record; it’s not very useful, it’s just to check whether the main steam valve and the control steam valves are leaking
Well, thank you. We’ve never kept any records
When analyzing potential problems with bearings and shafting systems, the length of the idle time can be used for comparison. We don’t keep any specific records of this during operation; it’s generally used only to retrieve the relevant curves for comparison when needed
Well, it mainly comes down to checking whether there are any faults with the press and whether there’s any steam leakage, right?
Yes, sometimes bearing damage, shafting deformation, or oil film issues that cause rubbing can lead to such variations over time; this value can be used as a reference
I asked, and our plant operators record this data every time a shutdown occurs, using it as a reference for identifying problems; however, there are many factors that can influence it
We haven’t kept any records of this; is this coasting time related to the speed at the time of stopping?
Analyze whether there is friction between moving and stationary parts, as well as steam leaks in the pipelines; how do you compare these aspects without keeping any records?
We really haven’t recorded whether the coasting time is related to the rotational speed at shutdown!
Let’s talk more about steam turbines; I’d like to learn about them too