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- A barring engine (also called barring motor) is a small engine that forms part of the installation of a large engine, and is used to turn the main engine to a favourable position from which it can be started. If the main engine has stopped close to its dead centre it is unable to restart itself. Barring may also be done to turn the engine over slowly (unloaded) for maintenance, or to prevent belt drives being left too long in one position and taking a "set". Originally they were used to turn stationary steam engines to a position from which they could be started. These early barring engines were themselves small steam engines. Today they are found on most large marine vessels, such as supertankers and container ships, and are driven by compressed air. For modern large scale power plant, after a generation unit has been shut down, the shaft line and casing is gradually cooled, where cooling might not be even for the upper and lower side of the shaft. The uneven cooling may cause bending to the shaft, ultimately leading to vibrations and unbalanced output. The barring gear will rotate the shaft at a low speed, typically 5rpm, until the shaft is completely cooled down, to avoid the above situation. (en)
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- A barring engine (also called barring motor) is a small engine that forms part of the installation of a large engine, and is used to turn the main engine to a favourable position from which it can be started. If the main engine has stopped close to its dead centre it is unable to restart itself. Barring may also be done to turn the engine over slowly (unloaded) for maintenance, or to prevent belt drives being left too long in one position and taking a "set". (en)
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