抄録
In this paper, citing fitting stainless steel pipe that is used, the results showed that the examined life of synthetic rubber used to prevent leakage. 1) The water supply system,, the life of synthetic rubber is around 50 years. 2) System in the fire water must be replaced frequently, life as much as synthetic rubber is expected to Water System. 3) The hot water system, the reference is the life of synthetic rubber-up to 15 are estimated to be about 20 years. 4) The chlorine is injected into the system as well water, the life of synthetic rubber is estimated to be around 30 years.
