Statistically Based CO2 Canister Duration Limits for Closed-Circuit Underwater Breathing Apparatus

摘要

Elementary statistical methods tare used to predict canister durations as a function of gas temperature and CO2 production rate. The canister duration data is fit to a 3 term polynomial using TableCurve 2D or similar curve fitting software. The best fit curve and the standard error of the estimate are used to derive prediction limits of varying degrees of confidence. Examples are given of the use of prediction limits in biomedical and manufacturing applications. From the prediction limits we can defines series of canister duration curves with increasing duration being associated with an increasing risk of canister breakthrough.