Module 3 Process Piping Hydraulics Sizing And Pressure Rating Pdf -
Where ( C ) = empirical constant (100–200 for continuous service), ( \rho_m ) = mixture density (lb/ft³).
: This is the most critical parameter for hydraulic calculations. It is derived from the Outside Diameter (OD) and the calculated wall thickness (t). Where ( C ) = empirical constant (100–200
[ t = \fracP_d \cdot D_o2(SEW + PY) ]
This paper outlines the core engineering principles for , covering the two independent design functions: fluid flow design (sizing) and pressure-integrity design (rating). 1. Fluid Flow Design & Hydraulic Sizing [ t = \fracP_d \cdot D_o2(SEW + PY)
60°C water, max operating pressure 10 barg → Design P = 11 barg. For CS ASTM A106 Gr B at 60°C, S = 138 MPa. Thickness: t = (11×168.3)/(2×138×1×1 + 0.4×11) ≈ 6.7 mm. Add 1.5 mm CA → 8.2 mm → Schedule 40 (7.11 mm? too low) → Use Schedule 80 (10.97 mm). Flanges: Class 150 suitable (19.6 barg @ 60°C). For CS ASTM A106 Gr B at 60°C, S = 138 MPa
Use pressure drop per 100 m (e.g., 200–500 Pa/m for liquids). Oversizing → high capital cost; undersizing → high pumping cost.
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