: To prevent erosion and excessive noise, typical liquid velocities range from 3–7 ft/s for suction lines and 5–15 ft/s for discharge lines, depending on the fluid. Pressure Drop

: For process engineers, the internal diameter is the most critical parameter for sizing, while the Nominal Pipe Size (NPS) serves as the standard reference for external dimensions. 3. Pressure Ratings and Wall Thickness

Every Module 3 PDF starts here. The pressure drop due to friction is: