GE’s STF-D Series is a modular product platform for utility reheat steam turbines in the 100 to 1,200 MW power output range.

Our reheat steam turbines modular

Our reheat steam turbines modular concept governs all engineering and manufacturing processes, and results in reduced construction and commissioning times, higher reliability, and excellent efficiency

To enhance performance

To enhance performance, the steam path is always adapted to the specific project requirements

The extensive LP last stage blade

The extensive LP last stage blade portfolio for 50 and 60 Hz models offers rear stage sizes from 30 inches up to 49 inches. The number and size of LP turbines can be tailored to specific site conditions—for example, the STF-D1050 steam turbine configuration can have up to five casings

Designed for Efficiency and Reliability

The STF-D Series is designed for main inlet conditions up to 650°C (1200°F) and 330 bar (4786 psi) and reheat temperatures up to 670°C (1238°F).

HP turbines can be equipped with a second main steam injection system by means of integrated overload valves. This method provides additional load reserve in cases of sudden steps in power demand.

Startup valves (TAL) help ensure a safe and trip-free runback from full load to house load after load rejection.

HP, IP, and valve units are shipped fully assembled enabling shorter installation time on site. The LP turbine is dispatched in pre-assembled lots for easier handling and reduced construction time on site.

Skid mounted lube and control oil systems with pre-assembled pumps, filters, valves, and interconnecting piping are available for all turbine sizes.

Sleeved rotor couplings help ensure durable shaft alignment and smoother operation.

Product Specifications

  STF-D1050 (double reheat) STF-D1050 (single reheat) STF-D850 STF-D650 STF-A650
Main Steam

Up to 320bar (4641psi)

Up to 600°C (1112°F)

Up to 330bar (4786psi)
Up to 650°C (1200°F)
Up to 245bar (3553psi)
Up to 585°C (1085°F)
Up to 190bar (2756psi)
Up to 600°C (1112°F)
Up to 190bar (2756psi)
Up to 600°C (1112°F)
Reheat Temperature

630°C (1166°F)RH1

630°C (1166°F)RH2

Up to 670°C (1238°F) Up to 585°C (1085°F) Up to 600°C (1112°F) Up to 600°C (1112°F)
Frequency 50 Hz 50 Hz and 60 Hz 50 Hz and 60 Hz 50 Hz and 60 Hz 50 Hz and 60 Hz
Output ≤ 1000 MW ≤ 1200 MW ≤ 1000 MW ≤ 700 MW ≤ 300 MW
Steam Turbine Efficiency Up to 54% Up to 54% Up to 49% Up to 47.5% Up to 47.5%
Maximum Backpressure 0.35 bar (10.34 inHg)
(0.7 bar (20.67 inHg) with special high back pressure rear stages)
Control Concept Sliding pressure mode Hybrid mode with or without overload valve Sliding pressure mode Fixed pressure mode