Barring Gear Motor and Turning Gear Motor

See the following, from Wikipedia search :-

http://en.wikipedia.org/wiki/Thermal_power_station#Barring_gear

However, although barring and turning might be often used interchangeably, there may be a difference. Turning gear might be provided only for turning a "stopped" set for mechanical inspection [or to shift it, if a piston has stopped so close to top or bottom "dead centre" there is no turning torque for (steam/air) starting] and be engaged only to a stationary unit, probably manually. Barring gear has to be engaged and dis-engaged to/from a turning unit and needs a more complicated mechanism and electric control - usually automatic. Regarding the motors, there could be a difference in size due to the speed required or the starting torque required. It is likely, if a unit needs barring, that this would also be suitable for turning (two speed?) - rather than have another gear/motor unit.

Not really both do the same job.

Some baring gear use diesel engines particularly on rotary kilns where a loss of power could damage a kiln beyond repair. I've had a kiln drive motor fail in heavy rain, the diesel donkey engine wouldn't start, the kiln was bent 10" out of true. Most of the refractory lining fell out!

Gives a whole new meaning to "That's the way the cookie crumbles"!

Crumble? It went with an almighty bang!

We straightened out the kiln by putting a low flame in it and slowly turning it on the donkey.

Hello TonyS,

Good to learn about the non-electric applications. What were you cooking in that kiln?

Lime ½ " to 2" for the stainless steel process.