Costs and Benefits of API Motors and Generators: Comparison and Recommendation of Features

The American Petroleum Institute (API) 541, 546, and 547 large motor and generator standards require many features that are not found in other large electric machines. These features make the machine more reliable, but they also add to the initial cost. This article compares the costs and benefits of some of the more significant features that may be specified and makes recommendations about the optional features that should be purchased for specific situations.