This guide is structured to serve as a study outline or a technical summary for engineers and designers.
Step 1 – Hydraulic Sizing
Try 6-inch Sch 40:
ID = 6.065 in = 0.5054 ft. Area = 0.2006 ft².
Velocity = (500 gpm * 0.002228 ft³/s/gpm) / 0.2006 = 5.55 ft/s (acceptable).
Re = (62.4 * 5.55 * 0.5054) / (1 * 0.000672) = ~260,000 (turbulent).
Friction factor f (from Moody, ε=0.00015 ft) ≈ 0.017.
Head loss hf = 0.017 * (500/0.5054) * (5.55²/(2*32.2)) = 8.1 ft.
ΔP = 8.1 ft * 0.433 psi/ft = 3.5 psi.
That’s well under 15 psi. Try 4-inch Sch 40:
ID = 4.026 in, v = 12.3 ft/s (high but possible).
hf ≈ 26 ft → ΔP = 11.3 psi (acceptable).
→ Select 4-inch Sch 40. This guide is structured to serve as a
Here’s a structured, high-quality text that you can use as the basis for a Module 3: Process Piping Hydraulics – Sizing and Pressure Rating PDF. You can copy this directly into a Word/Google Doc, format it, and save as a PDF. Step 1 – Hydraulic Sizing Try 6-inch Sch 40: ID = 6
Flanges are rated by "Class" (previously known as "Pound" or "lb"). Thickness requirements for internal pressure