Answer Posted / naga

GE gas turbines were basically divided into 2 different
classes.
1. E - class Ex: 6B, 9E
2. F - class Ex: 6FA, 7FA, 7FB, 9FA, 9FB,9FA+e

F class machines are newer machines and has higher power
generation capacity.

9FA means : "9" indicates Frame size and "F" indicates F -
class machine. FA and FB are two categories of F - class
machines.

9E means : "9" indicates Frame size and "E" indicates E -
class machine.

9FA+e means : "9" indicates Frame size, "F" indicates F -
class machine and "+e" indicates extended version of 9FA.

For ex: 9FA+e 'inspection interval' is more compared to 9FA.

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