Design of the outlet pipeline for Roots blowers
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Our plant’s wastewater treatment station is equipped with two Roots blowers, with a designed flow rate of 26 liters per minute, a pressure of 55 KPA, and an outlet pipe diameter of DN150. Normally, one in use and one as backup. The pipeline is currently corroded, and it is intended to increase its diameter to DN200. As the pipe diameter increases, the expansion pressure of the gas decreases ； As the pipe diameter increases, the frictional loss along the pipeline decreases. I seek advice from experts: How does gas pressure change at depths beyond 60 meters?
You originally chose a pipe diameter of DN150, with a nominal flow rate of 26 cubic meters per minute. Calculations show that the flow velocity inside the pipe is too high; even when using an outer diameter of 168 mm, the flow velocity reaches 19.6 m/s, which can cause significant damage to the pipeline. When using DN200, the flow rate is much lower, at only 13 m/s, which is within the normal range for air flow. As the pipe diameter increases, the pressure will certainly change, but not by much. The resistance in straight pipes changes very little, with the pressure loss being around 0.05 bar