Abstract
For quite some time there has been no generally accepted procedure for field testing of large fans of the type commonly used to provide mechanical draft in fossil fired steam generating units. The Performance Test Code Committee Number 11 of the American Society of Mechanical Engineers has been working on the development of an acceptable field test procedure for such fans. A fan test code is nearing completion. In order to insure that the test code methods are accurate and practicable and in order to evaluate the feasibility of relatively advanced velocity probes and electronic instrumentation, extensive field tests of two power-plant fans were carried out under the direction of members of PTC-11. Results of the tests indicate that an acceptable procedure for field testing large fans has been developed. This report describes the procedures used and the result of the field tests.
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