This will cause water hammering to blades of steam turbine leading to erosion, corrossion & pitting of blades which may lead to failure of blades. In the case of condensing steam turbine to prevent the air ingression at the shaft seal by Gland condenser and ejector arrangements(as per API 612). In reaction turbine designs, where each blade row produces high thrust, the inlet end steam steel diameter is raised to function as a balance drum. The steam turbine is a form of heat engine that derives much of its improvement in thermodynamic efficiency from the use of multiple stages in the expansion of the steam, which results … This leads to high thrust bearing loading. 10. The balance piston disc is arranged on the turbine wheel so that some high pressure steam is introduced on the low pressure side to push the other way. Steam turbine (1) according to Claim 4, wherein the dummy piston prechamber (15) is formed between the dummy piston (14) and the inner casing (9). reduce axial thrust Blade speed in a reaction turbine would be nearly twice as fast as the blade speed in a comparable pressure compounded impulse turbine under ideal conditions. Smaller (100-MW and less) Westinghouse turbines have piston seal rings on the main steam inlet pipes. When high pressure steam enters the first stage turbine wheel there will be a (pressure X area) thrust toward the low pressure end.
Blade Seals. In most modern turbines the difficulty is overcome by using “dummy pistons”, or large circular disks on which the steam presses to counteract the side pressure of steam on the moving blades. I claim 1. In an opposed flow steam turbine of the type having first and second turbine elements disposed on a shaft within a turbine casing, separately actuated first and second valves respectively admitting steam to first and second pressure regions supplying the respective turbine elements in series flow; and having a thrust bearing for absorbing residual axial shaft thrust, the … It has to do with counteracting thrust. a. counteract and balance axial thrust produced by the turbine rotor b. act in conjunction with gland seal steam to balance turbine thrust c. assist in maintaining radial clearances d. eliminate radial thrust caused by the pressure increases in the turbine … Vendor balance drum calculations should be audited during the pre-bid project phase to ensure proper thrust balance under all … Its modern manifestation was invented by Charles Parsons in 1884..
To counteract this force, steam is admitted to a dummy (balance) piston chamber at the low-pressure end of the rotor. Some designers also use a balance piston on impulse turbines that have a high thrust. 10. Some designers also use a balance piston on impulse turbines that have a high thrust. The glands condenser is a useful bit of kit that prevents steam escaping to atmosphere from the hp end of the turbine, and loss of vacuum from the lp end. Dummy piston is provided to oppose the axial thrust generated (in the direction of steam) due to incoming steam.


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