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To protect the mechanical integrity of the unit. The condenser is not designed to hold a pressure and as such must be prevented from any positive pressure above atmospheric. Often rupture discs are fitted as a mechanical prevention against any pressure surge.
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What is tripping speed?
in a steam turbine, it is the speed at which the turbine should not go above. some time they call it overspeed trip. because the turbine rotor and berings are not design for such high speed and is not capable to handle this huge cenerfugal forces. usually there is two type of trip system: Electronic and Mechanical. some Steam Turbins have both protaction system.
What is main steam stop valve?
Used in power generation. When steam turbine is on-line the Main Steam Stop Valve is fully open. When offline it is closed. Steam to turbine is controlled thru control valves after Main Steam Stop Valve
What is turbine overspeed trip?
Typically two balls with springs holding them down, When the turbine spins too fast, the centrifugal force pushes the balls past the resistance of the springs at which point they hit a lever that stops steam/compressed gas flow to the turbine and the turbine shuts down. They are designed to keep the turbine from going so fast that it damages itself or the piece of equipment it is driving.
Can you tell how emergency stop valve of turbine operates?
Unless it is an electronic governor on the turbine, there is a mechanical overspeed trip device which closes the trip valve (or trip throttle valve [TTV] on small turbines). This device is a spring loaded weighted pin set into the turbine shaft. At a particular set speed (110% of maximum operating speed, typically) the pin overcomes the force of the spring, flying part way out of the shaft and striking the trip mechanism linkage. This linkage up to that point was holding the trip valve open, now with the release of the linkage the spring on the trip valve instantly closes the valve stopping all flow of steam to the turbine. On electronic governors, when the set point on the turbine speed is reached it opens a solenoid valve (which requires a manual reset) which dumps all hydraulic pressure from the trip valve, allowing it to close.
What is meant by turbine latching?
CommentsThe protection of a turbine requires a device which ensures the turbine does not automatically restart once a protective trip resets. EG if an overspeed trip occurs you do not want the turbine to resume operation as soon as it slows down below trip speed as it could cycle into overspeed again and continue repeating the cycle. The trip logic therefore includes a lockout which must be manually reset before the turbine valves can be opened again.All sorts of devices are used but most commonly a hydraulic valve which isolates oil from the stop valves. It is separate from the trip solonoid but may be part of the overspeed trip hydraulicsIt was common for the hydraulic valve to have a mechanism referred to as a latch because once it opened it stayed open until the oil pressure was lost again. In electrical terms it is a seal in relayResetting this device is called latching the turbine
How do you overspeed steam turbine?
Run the turbine up to about 75% speed and trip it manually. Reset the trip linkage. Restart the turbine. Adjust the governor up until the overspeed trip mechanism trips the stop valve. Watch the tachometer, the overspeed trip should activate within 10% over the maximum allowable speed of the turbine, if it doesn't trip it manually and repair the trip.
What is tripping speed?
in a steam turbine, it is the speed at which the turbine should not go above. some time they call it overspeed trip. because the turbine rotor and berings are not design for such high speed and is not capable to handle this huge cenerfugal forces. usually there is two type of trip system: Electronic and Mechanical. some Steam Turbins have both protaction system.
What is main steam stop valve?
Used in power generation. When steam turbine is on-line the Main Steam Stop Valve is fully open. When offline it is closed. Steam to turbine is controlled thru control valves after Main Steam Stop Valve
Why lp heater have no qcnrv?
non-return valves of swing check type provided with a forced closing mechanism. They are installed in turbine extraction lines. The purpose of these valves is to prevent the back flow of heavy specific weight and low temperature steam to turbine during a turbine trip
What is effect on turbine generator if frequency is high or low?
turbine will trip
What is turbine overspeed trip?
Typically two balls with springs holding them down, When the turbine spins too fast, the centrifugal force pushes the balls past the resistance of the springs at which point they hit a lever that stops steam/compressed gas flow to the turbine and the turbine shuts down. They are designed to keep the turbine from going so fast that it damages itself or the piece of equipment it is driving.
What turbines meaning?
turbine trip
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.
Can you tell how emergency stop valve of turbine operates?
Unless it is an electronic governor on the turbine, there is a mechanical overspeed trip device which closes the trip valve (or trip throttle valve [TTV] on small turbines). This device is a spring loaded weighted pin set into the turbine shaft. At a particular set speed (110% of maximum operating speed, typically) the pin overcomes the force of the spring, flying part way out of the shaft and striking the trip mechanism linkage. This linkage up to that point was holding the trip valve open, now with the release of the linkage the spring on the trip valve instantly closes the valve stopping all flow of steam to the turbine. On electronic governors, when the set point on the turbine speed is reached it opens a solenoid valve (which requires a manual reset) which dumps all hydraulic pressure from the trip valve, allowing it to close.
What turbine trip is designed to occur at 10 percent above normal operation?
Overspeed trip.
What is meant by turbine latching?
CommentsThe protection of a turbine requires a device which ensures the turbine does not automatically restart once a protective trip resets. EG if an overspeed trip occurs you do not want the turbine to resume operation as soon as it slows down below trip speed as it could cycle into overspeed again and continue repeating the cycle. The trip logic therefore includes a lockout which must be manually reset before the turbine valves can be opened again.All sorts of devices are used but most commonly a hydraulic valve which isolates oil from the stop valves. It is separate from the trip solonoid but may be part of the overspeed trip hydraulicsIt was common for the hydraulic valve to have a mechanism referred to as a latch because once it opened it stayed open until the oil pressure was lost again. In electrical terms it is a seal in relayResetting this device is called latching the turbine
When was the first steam boat trip on water?
1707. The first record is that of a 15 mile trip by steam boat made by Denis Papin, travelling on the Fulda River.
