With a solid grasp of hydraulic principles, the module then moves into the practical methodology of pipe sizing. The goal is to select a nominal pipe size (NPS) and schedule that satisfies all process, economic, and safety constraints.
Using the target velocity, calculate the preliminary cross-sectional area:
): Fluid undergoes irregular fluctuations and mixing. Most industrial process piping operates in this regime. 2. Pipe Sizing Criteria and Velocity Limits With a solid grasp of hydraulic principles, the
Where:
Learn how the relationship between Pressure and Temperature impacts material selection and flange ratings (ASME B16.5). Most industrial process piping operates in this regime
= Allowable stress value for the material at design temperature = Quality factor (weld joint efficiency) = Weld joint strength reduction factor
of flanges and fittings match or exceed the pipe class rating (e.g., ASME Class 150, 300, 600). = Allowable stress value for the material at
): The pressure at which a liquid transitions into a vapor phase at a specific temperature. Flow Regimes
t=PD2(SEW+PY)t equals the fraction with numerator cap P cap D and denominator 2 open paren cap S cap E cap W plus cap P cap Y close paren end-fraction = Internal design gauge pressure = Outside diameter of the pipe
Nominal Thickness≥tm0.875Nominal Thickness is greater than or equal to the fraction with numerator t sub m and denominator 0.875 end-fraction
Mastering transforms you from someone who can draw a line on a P&ID to an engineer who can specify exactly what that line should be made of and how big it must be. The interplay between friction losses (hydraulics) and wall strength (pressure rating) is at the heart of every safe, economical piping system.