Calculation of True Six-Sigma Hose Crimp Compression Ranges Using Probabilistic Design Techniques

Compression is a key design attribute of both compressible seals and coupled hose systems. Traditional design techniques use 3-sigma upper and lower limits from capability studies on critical component dimensions to estimate potential compression variation. Probability calculations are shown that indicate that the true variation in compression is much less than this estimate. An alternative approach using probabilistic design techniques to calculate true 6-sigma (+/-3-sigma) compression variation is shown for both a typical radial seal and a hose coupling. The results are then compared to Monte Carlo simulations using representative data sets for each critical dimension.