When a piping slope is provided, the flow of the medium is easily maintained and gravity flow happens in the downward direction. The main requirement of pipe slopes is to avoid the accumulation of liquids inside the pipe. They are supported with variable-height pipe shoes. In this type of piping shoe, the height of the shoe is variable from one side to the other corresponding to the pipe slope. The usual practice for supporting pipes with slopes in process and power piping is to use a pipe shoe. Experience shows that with such slopes, trouble from deposits is seldom encountered. It is common practice to design sanitary sewers with slopes sufficient to provide for velocities of 2 ft/s (0.6 m/s) when flowing full. All piping in the main steam and hot and cold reheat line, turbine extraction system, condensate system, and turbine drains, of power plants are sloped down a minimum of ¹⁄₈ in/ft (10 mm/ m), in the direction of flow. 1, which is part of a piping isometric drawing. A special symbol is used to indicate slope in Process P&ID and Piping isometrics. The slope given is indicated to the construction team using piping isometrics. The requirement of the slope is usually mentioned in the process P&ID. The application of slope in piping or pipeline systems forces the liquid to go to the next low point of the line. The piping slope indicates the inclination of the pipe with respect to the horizontal ground or reference level. In extensive sewer systems (except in hilly areas), most of the pipes will have mild slopes. Drains and vents should be provided and piping sloped to facilitate liquid drainage and gas venting. Steam trap discharge lines should be sloped for drainage where possible. Fuel-oil lines in the fuel Oil Burner piping system should be sloped from the burner shutoff valves toward the burners to provide natural drainage. 
Compressor suction lines between the knockdown drum and the compressor should be as short as possible, without pockets, horizontal, and sloped toward the compressor.All piping in the main steam and hot and cold reheat line, turbine extraction system, condensate system, and turbine drains of power plants.Horizontal Sump Vessels (Slope in Equipment).
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