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What is usual pressure of gland sealing steam?
With load building inside the turbine, HPT and IPT leakage will go to the gland steam supply header to increase the pressure, which will compel the supply valve to close. Normally the auxiliary steam header is maintained at a fixed pressure and temperature (at 10 or 16 kg/cm2 and ∼ 210°C).
What is the pressure of a steam turbine?
In the biggest turbines, in large fossil-fuel power plants, the steam pressure can be as high as 20–30MPa (3000–4000 psi or about 200–270 times atmospheric pressure). A small, 10 megawatt steam turbine is roughly the same size as a Greyhound bus (a large single-deck passenger coach).
What type of steam is used in steam turbines?
Superheated Steam This yields steam that has a higher temperature and lower density than saturated steam at the same pressure. Superheated steam is mainly used in propulsion/drive applications such as turbines, and is not typically used for heat transfer applications.
What is turbine gland sealing?
The turbine gland sealing system (TGSS) prevents the escape of steam from the turbine shaft and casing penetrations and the glands of main steam stop and control valves. This system also prevents air leakage into the low pressure turbine glands.
What is a pump gland seal?
From Wikipedia, the free encyclopedia. A stuffing box or gland package is an assembly which is used to house a gland seal. It is used to prevent leakage of fluid, such as water or steam, between sliding or turning parts of machine elements.
What is a high pressure turbine?
High pressure turbine: The high pressure (HP) turbine (see Figure 1) is the first main engine turbine to receive steam from the main steam system. It is designed to efficiently extract work out of high pressure steam. The HP turbine is a pressure-velocity compounded, single axial flow, non-condensing impulse turbine.
What are the 3 types of steam turbine?
Steam Turbines. Three basic types of steam turbine are used to generate power as a by-product of process or exhaust steamml: condensing, pass-out condensing, and back-pressure.
How is steam pressurized?
Most industrial steam systems are closed systems. When water vaporizes to become steam in the boiler, the expansion pressurizes the system. Steam is forced out of the boiler by its own pressure and is carried by piping to whatever devices are to be employed for heating or processing.
What is gland seal water?
This gland seal water serves three important functions: it enables the pump shaft to rotate within its sleeve with minimum friction, it prevents the slurry from back-flowing into the seals and damaging the shaft, and. it allows for a small amount of cooling of the pump shaft, which heats up as it rotates at high speeds …
What is dummy piston in steam turbine?
Answer: Reaction turbines have axial thrust because pressure on the entering side is greater than pressure on the leaving side of each stage. To counteract this force, steam is admitted to a dummy (balance) piston chamber at the low-pressure end of the rotor.
What is turbine steam seal?