Hose remaining lifetime prediction method and hose remaining lifetime prediction system

A hose remaining lifetime prediction method, comprising:

• a hose in use, the hose in use including at least an inner tubular rubber layer, a reinforcing layer disposed on an outer peripheral side of the inner tubular rubber layer, and a sheath layer disposed on an outer peripheral side of the reinforcing layer,
• a temperature sensor for directly measuring a temperature of the inner tubular rubber layer,
• obtaining in advance, for a hose of a same type as the hose in use, a relationship between a use time of the inner tubular rubber layer at a reference temperature and a physical property value of a rubber forming the inner tubular rubber layer, the physical property value being elongation at break, or strength at break of the rubber forming the inner tubular rubber layer, and generating a thermal degradation model for the inner tubular rubber layer;
• calculating a reference temperature use time, for the hose in use, of the inner tubular rubber layer at the reference temperature until a time of prediction, wherein
• the reference temperature is a temperature of reference that is determined for convenience in predicting a remaining lifetime of the hose in use;
• the reference use time is calculated based on at least the temperature of the inner tubular rubber layer or the temperature of the fluid inside of the tank in communication with the inner tubular rubber layer as measured by the temperature sensor;
• and
• predicting the remaining lifetime of the hose in use, based on a comparison between the reference temperature use time and the thermal degradation model.