What is the clearance of bearing?

Bearing internal clearance is defined as the total distance either inner or outer ring can be moved when the other ring is fixed. If movement is in the radial direction, it is called radial internal clearance; if in the axial direction, axial internal clearance.

What are two types of clearance in a steam turbine?

What are two types of clearance in a turbine? Answer: Radial – clearance at the tips of the rotor and casing. Axial – the fore-and-aft clearance, at the sides of the rotor and the casing.

What is bearing in steam turbine?

turbine bearings are supported turbine rotor and protect the shaft from any tear and wear during the running condition with the help of a thin oil film which is produce by cyclic circulation of oil . One thrust bearing typically is provided for the entire steam turbine to maintain the axial position of the rotor.

What is bearing C3 clearance?

Internal clearance being C3 means that the bearing has room for expansion if needed between the races of the bearing, whilst holding the outer ring and moving the inner ring in a radial movement you will detect a little amount of play between the two rings. C3 means the bearing has more clearance than standard.

What is C4 clearance?

C2 C3 C4 bearings clearance is the gap between the bearing rolling elements and the inner and outer ring shells of the bearing. The size of the clearance (called the working clearance) during operation has an impact on the bearing’s rolling fatigue life, temperature rise, noise, vibration and other properties.

What is bearing clearance C3?

What are the 3 basic types of turbines?

There are 3 main types of impulse turbine in use: the Pelton, the Turgo, and the Crossflow turbine. The two main types of reaction turbine are the propeller turbine (with Kaplan variant) and the Francis turbine.

How many bearings are in a steam turbine?

Thrust and combined bearings. The thrust bearings used in steam turbines are generally of the tilting-pad type. The possibility of the angle of tilt to vary with load improves the load capacity of the bearing. Generally, two thrust bearings are installed in a front-to-front (Fig.

Which bearing is used in turbine?

Spherical roller bearings are often used in the main shaft of the turbine. It is also common to find a tapered roller bearings (TRB) used in combination with a cylindrical roller bearing (CRB) at this location, said Stephen Curtis, director of Renewable Energy Business.

What is C5 clearance?

C codes for degree of bearing clearance If a bearing has a C code, it offers extra internal clearance. C1 offers the least extra clearance, C5 offers the most extra clearance. The extra margin C3 offer is considered ‘normal’. Bearings with C3 are in fact the most commonly used.

What are the different types of steam turbine bearings?

Steam turbines have journal bearings and thrust bearings. Journal bearings are at each end of each rotor to support the weight of the rotor. One thrust bearing typically is provided for the entire steam turbine to maintain the axial position of the rotor. The journal bearings are constructed of two halves that enclose the shaft.

What is the function of the thrust bearing on a turbine?

Journal bearings are at each end of each rotor to support the weight of the rotor. One thrust bearing typically is provided for the entire steam turbine to maintain the axial position of the rotor. As the turbine bearings work with high speed, large load, thus requiring the bearing must be required to be safe, reliable and have small friction.

What are the sliding bearings in a turbine?

In order to meet these two requirements, turbine bearings are all adopts the sliding bearings based on theory of film lubrication. This bearings using cyclic fuel supply; the fuels supply system supply’s the bearing pressure and lubricants meeting the temperature requirements.

How do you measure the clearance of a bearing?

Tilting pad bearing are another matter. The clearances can be measured in place. One way of measuring vertical clearance is to use a soft metal or plastic wire that is squashed when the bearing is assembled. When the top is removed, the clearance is given from the thickness of the wire.