Brief introduction to the water supply and drainage drawings of the school dormitory building, which mainly includes domestic water supply and drainage, bathroom cold and hot water supply, fire hydrant system, etc. The domestic water supply pipe is polypropylene pipe (PP-R), which is connected by hot melt, and is represented by "DN"; Hot water pipe, hot water return pipe: copper pipe, screw connection, represented by "DN", P=0.6MPa。 Fire hydrant system pipeline: seamless steel pipe, welded. It is indicated by "DN", and the valves and fittings are flanged. P=1.0MPa。 This set of drawings mainly includes design description, water supply and drainage plan of each floor ..