Module 3 Process Piping Hydraulics Sizing And Pressure Rating Pdf Better [updated] Jun 2026

ASME B31.3 is the bible, but it is dense. A better Module 3 translates that code into a simple hierarchy:

Water flows at 1000 gpm through a 500-ft NPS 6 Sch 40 pipe. Elevation rise = 50 ft. Friction factor = 0.018. What is the total dynamic head (ft) required? ASME B31

To prevent severe erosion, noise, piping vibration, and water hammer, fluid velocities must remain within standard industry ranges. The table below outlines typical velocity constraints for common process fluids: Fluid Type / Service Recommended Velocity Range (m/s) Recommended Velocity Range (ft/s) 0.5 – 1.2 1.5 – 4.0 Pump Discharge (Liquids) 1.5 – 3.0 5.0 – 10.0 General Water Lines 1.0 – 2.5 3.3 – 8.0 Saturated Steam (Low Pressure) 20.0 – 30.0 65.0 – 100.0 Superheated Steam / Gases 30.0 – 60.0 100.0 – 200.0 Step 3: Compute Target Hydraulic Diameter Friction factor = 0

= Weld joint strength reduction factor (for high temperatures; equals at lower temperatures) The table below outlines typical velocity constraints for

Define flow rate, fluid properties (density, viscosity), temperature, and allowable pressure drop.