How to diagnose blade path deposits and performance deterioration on a GE Vernova GE D / H Class steam turbine
A gradual heat rate increase with no load change is almost always silica or sodium deposition on turbine blades. Check steam chemistry and compare blade path pressure ratios to baseline.
~90 min6 steps
How to diagnose gland steam seal leaks on a GE Vernova GE D / H Class steam turbine
Steam or vapor at the shaft seals with falling condenser vacuum usually means the gland steam regulator is set too high or too low, or the gland condenser exhauster fan has failed. Check the regulator setpoint and exhauster first.
~60 min6 steps
How to correct high vibration from slow-roll rotor bow on a GE Vernova GE D / H Class steam turbine
A 1x vibration that is high on roll-off but decreases with time is almost always a thermal rotor bow from cooling unevenly on the turning gear. Do not attempt to rush the start. Continue slow roll until eccentricity returns to normal limits before accelerating.
~240 min6 steps