Combined steam and gas
Marine propulsion system
From Wikipedia, the free encyclopedia
Combined steam and gas (COSAG) is a propulsion system for ships using a combination of steam turbines and gas turbines to power the shafts.
| Combined marine propulsion | |
|---|---|
| Combined diesel or gas | (CODOG) |
| Combined diesel and gas | (CODAG) |
| Combined diesel–electric and diesel | (CODLAD) |
| Combined diesel–electric and gas | (CODLAG) |
| Combined diesel and diesel | (CODAD) |
| Combined steam and gas | (COSAG) |
| Combined gas or gas | (COGOG) |
| Combined gas and gas | (COGAG) |
| Combined gas and steam | (COGAS) |
| Combined nuclear and steam | (CONAS) |
| Integrated electric propulsion | (IEP or IFEP) |
System
A gearbox and clutches enable either of the engines or both of them together to drive the shaft.[1] It has the advantage of the cruising efficiency and reliability of steam and the rapid acceleration and start-up time of gas. This system was mainly used on first-generation gas-turbine ships such as the Royal Navy's County-class destroyer and Tribal-class frigate.