Module 3 Process Piping Hydraulics Sizing And Pressure Rating Pdf

Step 1: Gather data – fluid properties, flow rate, allowable ΔP, pipe length, fittings.

Step 2: Assume a reasonable velocity (see ranges above).

Step 3: Calculate initial diameter.

Step 4: Select standard pipe size (NPS) and schedule.

Step 5: Compute actual velocity and Reynolds number. Step 1: Gather data – fluid properties, flow

Step 6: Calculate total ΔP (friction + minor + static).

Step 7: Compare with allowable ΔP. Adjust diameter if needed. Rule of thumb: For liquids, keep ΔP below

Rule of thumb: For liquids, keep ΔP below 2 – 3 bar/100 m for economic pumping.

Steady-state calculations assume constant flow. However, operational changes cause transients. Steady-state calculations assume constant flow

Once the size is selected, the pipe wall must be thick enough to contain the pressure safely.