How do you maintain a steam turbine?
How do you maintain a steam turbine?
Steam turbine bearings and seals should be physically inspected every two to three years. This entails opening the bearing housings; removing and inspecting the bearings and seals; and replacing any components as needed. The work is generally done during a planned shutdown.
How many hours may required in a large steam turbine to warm up?
They should be warmed up and cooled down slowly to minimize the differential expansion between the rotating blades and the stationary components. Large steam turbines may require approximately five to nine hours to warm up.
What causes steam turbine overspeed?
The overspeed event occurs when little or no energy is being consumed by the driven equipment, whether a generator, pump or compressor, and too much steam is provided to steam turbine.
How do you prevent an overspeed steam turbine?
Upgrading to a well designed electronic governor to improve speed control is a major step toward preventing a turbine overspeed. The mechanical governors can only sense speed and control the turbine at a predetermined speed.
What is turbine maintenance?
Turbine repair and maintenance services provide maintenance, overhauls, and repairs to wind, gas, steam, and water turbines. Turbines are typically constructed of a rotor assembly with attached blades that turn when they are in contact with fluid or air flow.
What is turbine overhauling?
The overhaul involves the complete disassembly, inspection, repair and reassembly of the turbine and the generator. Our professionals check all the quality parameters associated to this service and perform the service in the best possible manner.
What is maximum steam temperature?
The highest inlet steam temperature currently applied to actual supercritical pressure and USC steam turbines, is between 566°C and 620°C.
How do you calculate steam per hour?
The condensing rate may be determined from this by dividing the equipment rating (in kW) by the enthalpy of evaporation of the steam at the operating pressure (in kJ/kg) to give a steam flowrate in kg/s. Multiplying the result by 3 600 will give kg/h.
How do you test an overspeed trip?
It can be tested by increasing the engine speed by speed adjuster at no load condition. Over speed trip will cut-out the fuel supply at 115% of normal speed.
What is tripping of turbine?
A turbine trip is the emergency shutdown of a power-generation turbine due to unexpected events. Due to the number of issues that may cause a trip, they are relatively common events.
Why is it that the overspeed testing are required to test?
Turbine overspeed events lead to costly and dangerous catastrophic failures. Therefore the overspeed system has to be periodically tested to ensure the system has the adequate response time to protect the turbines, plants and personnel.
How often are wind turbines inspected?
two to three times per year
Wind turbines generally require preventative maintenance checkups two to three times per year.
What is the working principle of steam turbine?
In simple terms, a steam turbine works by using a heat source (gas, coal, nuclear, solar) to heat water to extremely high temperatures until it is converted into steam. As that steam flows past a turbine’s spinning blades, the steam expands and cools.
What are the types of steam turbine?
In order to match steam production to heat demand, there are three types of steam turbine in common use for CHP plants. These three are called a back pressure steam turbine, an extraction steam turbine and a condensing steam turbine. Each type will suit a different configuration of plant.
How do you check steam quality?
Steam quality is a measure of the amount of saturated steam that coexists with its condensate in a given system. Calculate it by dividing the mass of steam by the total mass of steam and condensate.
What is the CP of steam?
Steam Cp=1.8723 kJ/kg.
What is an overspeed test?
Overspeed testing allows us to run a fan at an increased speed for a given amount of time and prove that it will withstand the customer’s specific application. The overspeed chamber in our test lab is capable of handling fan impellers up to 58 inches diameter.