is the actual wall thickness. Because wall thickness varies across different pipe schedules (e.g., Schedule 40 vs. Schedule 80), process engineers must use the exact internal diameter rather than the Nominal Pipe Size (NPS) when performing hydraulic calculations. Fluid Flow Regimes
The Hazen-Williams equation is an empirical alternative used primarily for water distribution systems operating under ambient temperatures:
= Weld joint strength reduction factor (primarily used for elevated creep temperatures, otherwise is the actual wall thickness
Module 3: Process Piping Hydraulics, Sizing, and Pressure Rating Introduction
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Fluid Flow Regimes The Hazen-Williams equation is an
The behavior of fluid flow within a pipe is determined by the dimensionless Reynolds Number (
Per ASME B31.3 Section 304.1.2 , the minimum required design thickness ( Can’t copy the link right now
= Darcy friction factor (determined using the Moody Chart or the Colebrook-White equation) = Length of the pipe = Acceleration due to gravity Minor Losses in Fittings and Valves
, whichever is greater—to the maximum expected operating pressure to accommodate system upsets and surges. The ASME B31.3 Straight Pipe Thickness Formula