The 46.1 MW Engine

Photo courtesy of Dana Petroleum

The 46.1 MW marine gas turbine offers simple-cycle, two-shaft performance derived from GE's CF6-80C2 high-bypass turbofan aircraft engine. The same engine is available with a 52.7 MW rating.

Taking advantage of the CF6-80C2 low-pressure system's normal operating speed of 3600 rpm, the 46.1 MW (PC model) marine gas turbine couples loads directly to the low-pressure turbine shaft. This feature allows the commonality of the CF6-80C2 and the 46.1 MW gas turbine to be maintained. The results are low-cost, field-proven parts for the 46.1 MW gas turbine. The low-pressure compressor features independently controlled variable inlet guide vanes and the high-pressure compressor features variable stator vanes to modulate airflow, ensuring fast, easy startup/shutdown – even under partial loads.

This gas turbine is in use on floating production storage and offloading vessels, offshore platforms and power barges in marine environments. Currently over 1,000 46.1 MW units have shipped, logging more than 21 million operating hours.

The 52.7 MW (PG model) operates at 3850 rpm and has the advantage of much higher output. GE has developed a mechanical drive package for a variety of offshore projects where space is at a premium. It is particularly suitable especially for FPSOs below deck applications to free up valuable space on the upper deck.

The 46.1 MW and 52.7 MW marinated gas turbine modules are built and tested to United States Navy shock requirements, and are certified by Lloyd's Register NVR and RINA. These gas turbines are ideal for applications requiring high power.

These gas turbines produce low emissions, can operate on a variety of fuels and can be positioned almost anywhere on the ship to increase revenue-generating cargo or passenger space. Both are ideal for FPSOs, LNG carriers and yachts.

Models

46.1 MW

GE's 46.1 MW (61,851 shp) marine gas turbine is the most fuel-efficient simple-cycle unit in its size class, delivering over 40% thermal efficiency.

52.7 MW

GE's 52.7 MW (70,656 shp) marine gas turbine operates at 3850 rpm and has the advantage of much higher output than the 46.1 MW engine.

Comparison

  46.1 MW 52.7 MW
Output 61,851 shp (46,123 kW) 70,656 shp (52,689 kW)
SFC .333 lb/shp-hr
202.7 g/kW-hr
.335 lb/shp-hr
203.6 g/kW-hr
Heat rate 6,128 Btu/shp-hr
8,224 Btu/kWs-hr
8,675 kJ/kWs-hr
6,168 Btu/shp-hr
8,279 Btu/kWs-hr
8,773 kJ/kWs-hr
Exhaust gas flow 286 lb/sec
130 kg/sec
306 lb/sec
139 kg/sec
Exhaust gas temperature 853°F (456°C) 921°F (494°C)
Power turbine speed 3600 rpm 3850 rpm
Average performance, 60 Hertz, 59°F, sea level, 60% relative humidity, no inlet/exhaust losses