This paper describes the design and development of a new cylinder bolting system to replace the main joint hardware for both combustion (and steam) turbine applications. The new bolts are designed to be hydraulically tensioned to the specified preload and utilize ultrasonic verification of elongation. The new bolting system uses a reduced number of components in each assembly and the individual components themselves are of a simplified design. The new hardware can be applied to new equipment without modification and retrofitted to customer-owned equipment as a direct replacement for existing joint hardware. The prototype, production, and field testing of this hardware, the installation tooling; and ultrasonic elongation measuring equipment are described. This testing has shown significant savings in assembly and disassembly cycle times even after prolonged exposure to turbine operating temperatures in a corrosive environment. The new design of bolting is now standard equipment for the CW251B11/B12 combustion turbine manufactured by Westinghouse P.G.B.U.

Issue Section:
Gas Turbines: Structures and Dynamics
Topics:
Cylinders, Turbines, Hardware, Design, Combustion, Elongation, Manufacturing, Testing, Cycles, Engineering prototypes, Operating temperature, Steam, Tooling
1.
Goodier, J. N., 1939, “The Distribution of Loads on the Threads of Screws,” presented at the ASME Annual Meeting, Philadelphia, PA, Dec. 8.
2.
Stoeckly, E. E., and Macke, H. J., 1951, “Effect of Taper on Screw Thread Load Distribution,” contributed by the Power and Fuels Divisions and presented at the ASME Spring Meeting, Atlanta, GA, Apr. 2–5.
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Copyright © 1997
 by The American Society of Mechanical Engineers
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