Statistical Analysis on Service Life of Mechanical and Electrical Sewerage Equipments

Abstract

Wide variety in mechanical and electrical sewerage equipments (MESE) causes difficulty in evaluation of service life in physical asset macro-management. This paper tries to analyze MESE life time by evaluating monetarily expenditure of MESE and by applying Weibull distribution to statistical MESE data of all Japan.
Estimated parameters of Weibull distribution are 4.34 and 29.2. Average service life and standard deviation are calculated to be 26.6 and 6.9 years. Using that distribution, future rehabilitation expenditure of MESE in all Japan is also predicted to be approximately 680 billion yen per year.