Turbine Rear & Front Gland Seal Temperature

As the heat energy (enthalpy) in the entering superheated steam is converted into electrical energy, the steam cools; thus the gland near the exit would be cooler.

The front end gland seal temperatures are slightly higher than rear end because initial steam that is higher in temperature admits into turbine casing from front end.

Temperatures of gland seals at rear end are normally lower than front end because steam expands towards rear end.

Normally front side is the steam inlet side of the turbine and high temperature steam leaks through the gland, where as at the rear end steam enthalpy is almost used and temperature and pressure gets reduces to almost below ambient and mostly sealing steam is supplied to seal the vacuum in most of the turbines. Thus there is always difference of temperature at front and rear glands.