Module 3 Process Piping Hydraulics Sizing And Pressure Rating Pdf ((better)) -

This module focuses on the engineering principles required to determine the optimal pipe diameter and verify its mechanical integrity under pressure. It bridges the gap between process requirements (flow) and mechanical design (safety) CEDengineering.com 1. Process Piping Hydraulics

• ( t ) = Minimum required thickness (mm)
• ( P ) = Design pressure (MPa)
• ( D ) = Outside diameter (mm)
• ( S ) = Allowable stress at design temp. (MPa) – from ASME B31.3 Table A-1
• ( E ) = Quality factor (e.g., 1.0 for seamless, 0.85 for ERW)
• ( W ) = Weld joint strength reduction factor (≤1)
• ( Y ) = Coefficient (0.4 for ferritic steel ≤ 482°C)

C. Pressure Drop Calculations

Calculating the friction loss is the core of hydraulic analysis. This module focuses on the engineering principles required

Proper sizing balances flow performance with capital costs. Key considerations include: ( t ) = Minimum required thickness (mm)

t=PD2(SEW+PY)t equals the fraction with numerator cap P cap D and denominator 2 open paren cap S cap E cap W plus cap P cap Y close paren end-fraction (Where = Internal design gage pressure, = Outside diameter, and = Allowable stress). higher for superheated steam.

Wall thickness and reinforcement checks

Invitation (intriguing angle)

• Major losses (pipe friction) vs. minor losses (fittings, valves, sudden expansions/contractions).
• Darcy–Weisbach equation for head loss: h_f = f (L/D) (V^2/2g).
• Friction factor determination: Moody chart and Colebrook–White implicit solution; explicit approximations (Haaland, Swamee–Jain) for quick calculations.
• Equivalent length method for valves and fittings; typical K-values for common components.