A method is presented for predicting the performance of modern steam turbine-generator units designed for high efficiency levels. This method is based on recent developmental and analytical results. The necessary curves, tables, and instructions are provided for the application of the method to a large variety of units of various kilowatt ratings, types, and steam conditions. Relative heat-rate curves are presented and mathematical expressions are provided for computer applications.
The experience gained from conducting an ASME Steam Turbine code testing using radioactive tracers has confirmed the encouraging results obtained during initial feasibility studies. The test also demonstrated the practicability of this method for testing steam turbines operating in the wet region from steam supplied by light water nuclear reactors. Recommendations for the location and installation of the sample and injection points are included, together with an outline of the equipment and procedures used during the testing.
The proper analysis of routine steam turbine performance test data can afford valuable information on the internal condition of a steam turbine. This paper outlines the theory behind the analysis of test data together with several case histories illustrating the use of the analysis to pinpoint various steam turbine problems.
fioient of a throaVtap nozzle can be predicted with a 95 percent certainty to ±0.3 percent.2 The statistically derived curve agrees in slope and is within 0,08 percent of the theoretically calculated curves of flow coefficient.3 The effect of /3-ratio on the flow coefficient is small. Less than 0.2 percent change for /3-ratio's ranging from 0.75 to 0.371.4 The repeatability of the throat-tap flow nozzle and the General Electric Calibration Facility is within 0.1 percent.5 The flow coefficient of a throat-tap nozzle does not change significantly with use.6 The flow check obtained during ASME tests on crosscompound steam turbines presents proof that the absolute accuracy of throat-tap-nozzle flow measurement is better than ±0.25 percent.Our experience shows that the throat-tap flow nozzle complies with the stringent requirements specified in the ASME Code PTC-6-1964 [12] and continues to warrant the position of the "Code" recommended flow measuring device. Some other devices have been found to fall short of the code specifications resulting in the exclusive use of the throat-tap nozzle for large steam turbine acceptance testing.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.