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  • Couplings and Alignment
    Gas Turbine Engineering Handbook, 2006
    Co-Authors: Meherwan P. Boyce
    Abstract:

    This chapter focuses on couplings and Alignments used in turbomachineries. Couplings in most turbomachines attach the driver to the driven piece of machinery. High-performance flexible couplings used in turbomachines perform three major functions that include: efficiently transmitting mechanical power directly from one shaft to another with constant velocity, compensating for misAlignment without inducing high stress and with minimum power loss, and allowing for axial movement of either shaft without creating excessive thrust on the other. There are three basic types of flexible couplings that satisfy these requirements. The first type is the mechanical-joint coupling, in which flexibility is accomplished by a sliding and rolling action. Mechanical-joint couplings include gear tooth couplings, chain and sprocket couplings, and slider or Oldham couplings. The second type is the resilient-material coupling, in which flexibility is a function of flexing of material. Resilient-material couplings include those that use elastomer in compression, elastomer in shear, steel springs and steel-disc, and diaphragm couplings. The third type is the combined mechanical and material couplings where flexibility is provided by sliding, or rolling and flexing. Combination couplings include continuous and interrupted metallic-spring grid couplings, nonmetallic gear couplings, nonmetallic chain couplings, and slider couplings that have nonmetallic sliding elements. The Alignment procedures consist of three steps that include preAlignment survey, cold Alignment, and the Hot Alignment Check. In preAlignment survey, piping, grouting, foundation bolts, and shim packs are studied and ascertained to be appropriately done and of good quality. The two predominant techniques used for cold Alignment are the face-OD method and the reverse-dial indicator method.

  • 18 – Couplings and Alignment
    Gas Turbine Engineering Handbook, 2006
    Co-Authors: Meherwan P. Boyce
    Abstract:

    Publisher Summary This chapter focuses on couplings and Alignments used in turbomachineries. Couplings in most turbomachines attach the driver to the driven piece of machinery. High-performance flexible couplings used in turbomachines perform three major functions that include: efficiently transmitting mechanical power directly from one shaft to another with constant velocity, compensating for misAlignment without inducing high stress and with minimum power loss, and allowing for axial movement of either shaft without creating excessive thrust on the other. There are three basic types of flexible couplings that satisfy these requirements. The first type is the mechanical-joint coupling, in which flexibility is accomplished by a sliding and rolling action. Mechanical-joint couplings include gear tooth couplings, chain and sprocket couplings, and slider or Oldham couplings. The second type is the resilient-material coupling, in which flexibility is a function of flexing of material. Resilient-material couplings include those that use elastomer in compression, elastomer in shear, steel springs and steel-disc, and diaphragm couplings. The third type is the combined mechanical and material couplings where flexibility is provided by sliding, or rolling and flexing. Combination couplings include continuous and interrupted metallic-spring grid couplings, nonmetallic gear couplings, nonmetallic chain couplings, and slider couplings that have nonmetallic sliding elements. The Alignment procedures consist of three steps that include preAlignment survey, cold Alignment, and the Hot Alignment Check. In preAlignment survey, piping, grouting, foundation bolts, and shim packs are studied and ascertained to be appropriately done and of good quality. The two predominant techniques used for cold Alignment are the face-OD method and the reverse-dial indicator method.