| 摘要 |
PROBLEM TO BE SOLVED: To provide a chemical washing method for boiler piping capable of easily conducting chemical washing of boiler piping.SOLUTION: A chemical washing method for boiler piping includes: a boiler-water drainage step of draining boiler water from a water drum after stopping a boiler; an acid-washing-liquid supply step of cooling hot water from adjacent equipment down to a temperature equal to or lower than a predetermined temperature, supplying an acid washing liquid to the hot water, supplying the acid washing liquid diluted to have a predetermined concentration to the empty water drum, subsequently filling a steam drum with the acid washing liquid at the predetermined concentration over predetermined time, and chemically washing boiler piping; an acid-washing-liquid drainage step of draining the acid washing liquid after end of supplying the acid washing liquid; and a water washing step of washing an interior of the boiler piping using pure water after draining the acid water liquid. |
