CADCENTRAL, NIGERIA

 Introduction Dishing in Diaphragms are caused by high temperature and high stresses, Which causes creep in steel over time. According to a GE publication, it states that dishing beyond approximately 0.1 inch (25.4mm) causes rotor rubbing which can result in a costly repair. Creep affects the internal micro-structure of the steel and cannot be removed but can be reduced. Below is the report from a study undertaken to observe the effect of the gradual increase in the operating temperature and pressure load on the diaphragm. Diaphragm Geometry Diameter  3000.00 mm Width              1500.00 mm Thickness  142.00 mm Material Specification   Steel ASTM A36 (study preference) Boundary Conditions Load                             9.579MN Applied Temperature    300 ° C Result Displacement  Heat Flux Von Misses Stress

TECHNICAL REPORT ON THE REPAIR OF DISHING ON A DIAPHRAGM 1.0      INTRODUCTION Definitions of dishing in a diaphragm is the form of deformation that occurs across the axis of the diaphragm. The diaphragm is a hollow disk that holds the stator blades (nozzles) in its annular area. (The rotor blades are fixed on the turbine rotor.) In each stage, a diaphragm consists of an upper- and a lower-half. Each half of the diaphragm is fixed to the respective halves of the casing. This design makes the assembly/disassembly of the turbine feasible. Figure 1     Image of a Diaphragm 1.1      Causes of Dishing in Diaphragm           Operational rubs or severe creep deflection from exposure to high stream pressure differentials across the blade ring and inner Web when operating at high temperature. 1.2      Problem Statement The dishing occurs such that the diaphragm experiences distorting across it cross axis and the

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