Pressure of the waste pipe
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The wastewater from the process pipelines within the plant is discharged directly into the wastewater tank through these pipelines. If the pressure in the process pipelines is 1.5 MPa, what is then the pressure in the wastewater pipe downstream of the discharge valve?
The pressure loss of a regular drain valve is very small and can be considered negligible.
The waste pipe cannot be under pressure, so pressure is not a concern; however, it must have sufficient flow capacity during use, otherwise backflow may occur if multiple devices discharge waste simultaneously.