Includes "minor losses" from valves and fittings ( -factors). 🛡️ Pressure Rating & Wall Thickness
Selecting pipe material, schedule, and thickness to withstand operating, design, and surge pressures. 2. Key Concepts in Piping Hydraulics Sizing
accounts for real-world irrecoverable pressure losses due to friction and fittings. Characterizing Flow Regimes Includes "minor losses" from valves and fittings ( -factors)
Pressure drop due to friction in a straight pipe is calculated using the Darcy-Weisbach equation:
Re=ρvDμRe equals the fraction with numerator rho v cap D and denominator mu end-fraction = Fluid density ( = Fluid velocity ( = Inside diameter of the pipe ( = Dynamic viscosity ( Laminar Flow ( Key Concepts in Piping Hydraulics Sizing accounts for
1f=-2log10(ϵ3.7⋅ID+2.51Ref)the fraction with numerator 1 and denominator the square root of f end-root end-fraction equals negative 2 log base 10 of open paren the fraction with numerator epsilon and denominator 3.7 center dot ID end-fraction plus the fraction with numerator 2.51 and denominator cap R e the square root of f end-root end-fraction close paren
No more confusion between psi/100ft vs. kPa/m. A better PDF provides a dual-unit table for pressure drop, viscosity, and density. A better PDF provides a dual-unit table for
9 minutes. Skill level: Intermediate to Advanced.
= Coefficient valid for specific materials and temperature ranges Total Nominal Wall Thickness Calculation The actual ordered thickness (
P=2StDcap P equals the fraction with numerator 2 cap S t and denominator cap D end-fraction