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Why the turbine trip in thrust bearing metal temperature high?
Wiki User
∙ 11y ago
To keep from damaging the thrust bearing if the lubrication system fails to cool it sufficiently. The surfaces of thrust and journal bearings is a metal called babbit. Babbit metal is an alloy of tin, lead, copper and antimony, typically. This metal has a high "lubricity" value (meaning it is slippery) and oil is used to create a wedge or film, to stabilize the shaft in position, which decreases as the oil gets hotter. Babbit will also melt at low temperatures, so temperature trips are in place on each bearing to prevent damaging them.
Wiki User
∙ 11y ago
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Can Steam Turbine Thrust Bearing temperature protection device be considered a similar protection for the Steam Turbine Rotor Position protection device?
No these are two different sensors. The thrust bearing temperature trip device measures either the metal temperature of the bearing, or the oil temperature exiting the bearing, or both. If this temperature exceeds recommended temperatures by 10 to 15% the turbine will trip to avoid damaging the bearings or shaft. The rotor position sensor is a proximity cell that monitors the axial position of the turbine rotor, often there is four such sensors mounted at the end of the rotor, if the distance between the sensors and the rotors exceeds a specific distance ( often 15-30 mils) the sensors indicate a failure, if two or three sensors indicate failure the turbine will trip.
How do you tell if main thrust bearing is bad?
You can tell if the main thrust bearing is bad by simply checking out the oil. If you notice little metal particles, chances are the thrust bearing has spoiled.
What is a steam turbine jacking oil system?
at the time of turbine start up, the shaft journals are in contact with the white metal of the bearings due to the weight of the rotor. The low pressure of the lubricating oil supply when the set is stationary is insufficient to stop the metal to metal contact between journals and bearing shells. In order to prevent the metal to metal contact between journal and bearing shell during start up, which is damaging in the long term, an oil pocket machined into the bottom shell of the journal bearing is supplied with oil under high pressure. This lifts the shafting system slightly and it floats on a film oil. this is called jacking oil system of turbine
What has the author Francis S Stepka written?
Francis S Stepka has written: 'Analysis of uncertainities in turbine metal temperature predictions' -- subject(s): Cooling, Airplanes, Turbine-propeller engines
What type of bearing to use for no metal on metal contact?
Sleeve bearing
Why to out bleed steam in turbine?
When steam contains liquid droplets while doing work at high temperatures, the water droplets can etch metal. To combat this, steam can be superheated or the pressure of the system is reduced.
What is metal shots?
bearing
How do you calculate white metal bearing clearances?
There is no simple formula to calculate the metal bearing clearance. Manufacturers must specify the clearance for each individual bearing.
What is the difference between friction and antifriction bearing?
in friction type the bearing metal is direct contact with shaft metal, but in the antifiction the rolling element is contact with the bearing races only.
Is hematite metal or nonmetal?
Hematite is a metal-bearing ore, but it's not a metal itself.
How many ball bearings are there in the world?
AnswerYou will have to do some research. number of manufacturers and their production levels. example: Timken Bearing: produced 2.5 billion ball bearings in 1998. : Stats are their are 80%-90% still in service and those not are in junk yards.You have a lot of work ahead of you if you really need to know this answer.It depends on bearing qualities the manufacturing of bearings depends on demand. the different varieties are-Taper Roller Bearings, Deep Groove Ball Bearings, Cylindrical Roller Bearings, Spherical Roller Bearings, Spherical Thrust Bearings, Clutch Release Bearings, Needle Roller Bearing, Self Aligning Ball Bearings, Angular Contact and Double Row Bearings, King Pin Bearings, UCP Pillow Block, Water Pump Bearing, Ball Bearing Manufacturers, Metal Bearing exporters, Roller Bearing, Needle Bearings, Automotive, Roller High Precision Manufacturers, THRUST BALL BEARING, Automobile Bearing, Thrust Bearing, Roller Bearing Cylindrical Manufacturers, Needle Bearing Cages Manufacturers, Engine Bearings Manufacturers, Elevator Part Bearing Hanger ManufacturersVisit Us At http://www.arb-bearings.com
What happens when you overheat a bearing?
When a mechanical bearing becomes overheated for whatever reason, the lubricating material will become less viscous, and the danger of metal-to-metal contact increases. This will lead to the failure of the bearing.
