N30 - Main Turbine Flashcards
What’s the purpose of the combined journal and thrust bearing?
Journal - supports the weight of the shaft (radial)
Thrust - maintains desired operating clearance (axial)
What’s the purpose of the Atmosphere Relief Diaphragms?
Protects the condenser from over pressurizing
What pressure do the atmospheric relief diaphragms open at?
4 psig
Where are the atmospheric relief diaphragms located?
Low pressure turbine
What’s the purpose of the main turbine?
converts steam energy into mechanical energy
What’s the purpose of the turbine casing?
Directs steam into the turbine blades
what’s the purpose of the turbine shaft and blades?
the blades turn the shaft which turn the generator
what’s the purpose of the shaft seals?
keep steam in and atmosphere air out (labyrinth seal)
what are the turbine critical speeds?
400-1700 rpms and > 1854 rpms for > 2 hours
which turbine has the combined bearings?
high pressure turbine
what type of bearings are on the low pressure turbine?
journal bearings
