Extended data:
In water supply and drainage engineering drawings, abbreviations have the following meanings:
Water supply pipeline -J, if divided into high and low areas, is usually represented by the initial letter, that is, high area -G and low area-d.
Drain pipe -W, which means sewage. And -F, it's wastewater. Rarely use-p.
Fire hydrant pipe -XH.
Automatic sprinkler -Z or -ZP.
Rainwater pipe-y.
Heating pipe -R, generally the solid line indicates the water supply pipe, and the dotted line indicates the return pipe.
Pressure drainage.
Condensing water pipe -n
Riser -l
In addition, the model letter of the equipment: Q- flow or air volume H- lift N- power P- pressure QW- submersible sewage pump and other valves and appliances are distinguished by graphics.
JL- water supply pipeline; WL- sewage pipe; YL- rainwater pipe; RJL- hot water supply; RHL- hot backwater.