Hydraulics Sizing And Pressure Rating Pdf | Module 3 Process Piping
Module 3 — Process Piping Hydraulics: Sizing & Pressure Rating (Reference overview)
Summary
Practical worked examples (concise)
: Design pressure is typically set at the operating pressure plus a safety tolerance, often around Wall Thickness Calculation : Following ASME B31.3 , the required thickness ( Module 3 — Process Piping Hydraulics: Sizing &
Example:
NPS 4, Sch 40 (OD = 114.3 mm, wall = 6.02 mm), carbon steel (SA-106 Gr. B), ( S = 138 ) MPa @ 200°C →
Max P ≈ 9.3 MPa (1350 psi). Safety : Safety is the top priority when
Darcy-Weisbach Equation: The most universally applicable formula for head loss due to friction. $$h_f = f \cdot \left( \fracLD \right) \cdot \left( \fracv^22g \right)$$ Hand calculations: Darcy–Weisbach
8. Software and tools
- Hand calculations: Darcy–Weisbach, Colebrook, Swamee–Jain.
- Useful software: PIPE-FLO, AFT Fathom (fluids), CAESAR II (stress + pressure), general-purpose CFD for complex flows.
- Spreadsheet templates: iterative diameter solver with friction factor routine.
- Safety: Safety is the top priority when designing process piping. The design must ensure that the pipe can withstand the required pressure and flow rates.
- Cost: The cost of the pipe and its installation must be minimized while ensuring safe and efficient operation.
- Efficiency: The design must optimize efficiency by minimizing pressure drop and head loss.