Fig. 10

Analysis of expected costs of scenario B after 20 years, considering different frequencies of execution of preventive maintenance and different values for the λ parameter of tanks. a λ=9.85·10⁻⁷ h⁻¹ (“average”). b λ=3.02·10⁻⁶ h⁻¹ (“high”). c λ=1.27·10⁻⁷ h⁻¹ (“low”)