Stations: Certain locations in the gaspath are referred to as
stations. Each station has a number for easy identification. Station numbers
are used to identify important points for definitions and descriptions
for engine performance, configuration and design. Some of the station
numbers are attached to pressure or temperature abbreviations to form
short names for those locations. For example Ps4 is the static pressure
at station 4 (HP discharge static pressure), Tt7 is total temperature
at station 7 (turbine discharge, exhaust gas total temperature
Discharge, inter turbine inlet
Discharge, behind exit guide vanes in annular duct
Discharge, 6th stage air
Discharge, 13th stage air
are raised edges or rims that are at right angles to the cases or ducts.
They function as the mating surface for bolting engine sections together,
Increasing stiffness of the structural parts, such as cases. Act as attachment
points for engine components.
flange is identified by a letter, in sequence starting with A for the
front flange. One flange has a number added to identify that it is a non
mating flange that is not used to join cases or ducts, It's for stiffness
and bracket mounting.