1.1 Applicability. This Standard Practice is applicable to enclosed speed reducers wherein the gear tooth designs include helical and herringbone gearing This Standard is intended primarily for beam type pumping units.
1.2 Limitations. The rating methods and influences identified in this Standard Practice are limited to single and multiple stage designs applied to oilfield pumping units in which the pitch line velocity of any stage does not exceed 5000 feet per minute (25 meters per second) and the speed of any shaft does not exceed 3600 revolutions per minute.