A statistical method for estimating the life expectancy of certain shipboard equipment

摘要

This paper reviews an inexpensive statistical-samling methodology that can be used to determine the attri- tion rates of certain types of shipboard equipment. The methodology relies on surveys that are conducted in conjunction with regularly scheduled ship visits over a period of time and a statistical analysis of the survey results. The statistical technique allows for reasonably estimates to be made of attrition rates. The specific example cited in this paper is related to galley-type refrigeration equipment, such as salad Chillers, beverage dispensers, et cetera. In the case of galley-type refrigeration equipment, the Navy needs To know whether the Fleet's inventory of equipment relying on Class I Ozone-Depleting Substances (ODSs)will be replaced through natural attrition by the end of fiscal year(FY) 2005, at which time supplies of ODS-based refrigerants will no longer be available for use by ship galleys.