Such turbines are used in power plants, each turbine driving a generator producing electricity. ... The barring gear assembly also initiates rotation of the shaft during a startup phase prior to injection of steam in the steam turbine. The rotation speed of the shaft during turning phases is low and constant.
What is barring in compressor?
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. ... Originally they were used to turn stationary steam engines to a position from which they could be started.
What is barring in gas turbine?
There are many gas turbines which use a “turning gear” sometimes called “barring” to keep the rotor from bowing when shut down. Most F-class GE machines use a turning gear instead of a ratchet for cooldown operation.
What is barring device for reciprocating compressor?
The barring device should be designed so that gas forces acting on the pistons cannot cause the compressor either to accelerate or to rotate in the reverse direction. With the barring device engaged, it should not be possible to start the compressor [6].
What is turbine shafting?
Turbine Shaft. THE SHAFT connects the turbine to the generator , turning at the same speed as the turbine.
What is a barring drive?
Introduction An inching drive is also referred to as a Sunday drive, barring drive, turning gear, jack drive, or auxiliary drive. It is a mechanical system used to turn the equipment at a slower than normal operating speed .
What is a barring device?
Engine barring devices are connected to engines . Known barring devices have been used to rotate crankshafts of engines and adding features to these known devices increases the complexity and cost of such devices. The subject barring device (10) includes a shaft (32) adapted for both axial and rotational movement.
What is the function of barring gear?
The barring gear assembly also initiates rotation of the shaft during a startup phase prior to injection of steam in the steam turbine. The rotation speed of the shaft during turning phases is low and constant.
What is a turning gear?
marine. A reversible electric motor which, through a system of gears, can be used to turn slowly a large diesel engine or steam turbine and gearbox assembly. It enables precise positioning for overhaul or examination. The engaging and disengaging of the turning gear is accomplished by the lever.
What are 4 types of compressor capacity control?
Compressor capacity-control methods are utilized to maintain a required compressed gas delivery under variable process conditions. The main capacity control methods for reciprocating compressors are variable-speed drives, suction valve unloaders, step-less methods, clearance pockets and bypass recycling .
What is unloading of compressor?
Load/unload mode is where the compressor alternately goes to its fully loaded condition when a lower pressure set point is reached, and then unloads at a higher set point, with the unloaded compressor remaining running, but producing no air.
What is capacity of compressor?
Compressor capacity can be defined as the amount of air the unit is able to pump out . ... While a small and large compressor can have the same pressure capabilities, the larger model has a greater capacity to produce more compressed air. Capacity is expressed in terms of cubic feet per minute (CFM).
Where is turbine used?
Turbines are used in many different areas, and each type of turbine has a slightly different construction to perform its job properly. Turbines are used in wind power, hydropower, in heat engines , and for propulsion. Turbines are extremely important because of the fact that nearly all electricity is generated by them.
What are the two main types of steam turbines?
Two types of steam turbines must be considered, condensing and noncondensing .
What is turbine and how it works?
A wind turbine turns wind energy into electricity using the aerodynamic force from the rotor blades , which work like an airplane wing or helicopter rotor blade. When wind flows across the blade, the air pressure on one side of the blade decreases.
Which motor is used for kiln drive?
The number of pinions depends on the size and capacity of the kiln. The drive consists of an electric motor with frequency converter, gearbox, couplings and auxiliary drive. A diesel engine can be added to the auxiliary drive. The pinion and girth gear are grease lubricated.
