Module 3 Process Piping Hydraulics Sizing And Pressure Rating Pdf Jun 2026

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).

Design pressure ≥ maximum operating pressure. Design temperature includes safety margin. Example: NPS 4, Sch 40 (OD = 114

[ D_opt = 0.363 \cdot Q^0.45 \cdot \rho^0.13 ] Example: NPS 4

: The primary method for calculating frictional pressure loss based on pipe roughness and fluid velocity. Hazen-Williams Equation : Often used specifically for water systems. Minor Losses Sch 40 (OD = 114.3 mm

The standard formula for straight pipe under internal pressure:

The sizing of process piping is a balance between initial capital costs (pipe material) and long-term operating costs (energy for pumping).