I suspect that you are considering to change from carbon seal to DGS used for steam turbine 1 stage. Before changing to use another kind of sealing method, you need to conduct Hazop analysis. the risk could be from Installation, leaking, material plan...
In case of seal failed, the leaking, of course, is a problem. Together it, reducing performance, vibration, temp... could happen.
you should base on seal OEM recommendation and monitoring/recorded data to decide when you should replace.
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