Sizing must also satisfy the maximum allowable pressure drop across a line segments to ensure process targets are met at downstream equipment: (Crucial for Net Positive Suction Head available - NPSHa) Pump Discharge Lines: Gas/Vapour Lines: Step-by-Step Sizing Equation
, these vapor bubbles violently collapse. The micro-jets create localized pressures up to , pitting and destroying impellers, valves, and pipe walls.
These class designations do not represent fixed maximum working pressures in psi across all conditions. Instead, they serve as reference labels. Pressure-Temperature Ratings Sizing must also satisfy the maximum allowable pressure
Water flows through an NPS 6, SCH 40 pipe (ID = 6.065 inches) at 1,500 GPM. The pipe length is 500 ft. Density = 62.4 lb/ft³, Viscosity = 1 cP. Calculate the velocity and friction loss.
: Piping must be sized to avoid excessive velocity, which causes high pressure drops, noise, and erosion. Internal Diameter (ID) : Calculated as ODcap O cap D is the outside diameter and is the wall thickness. Instead, they serve as reference labels
The primary goal of hydraulic sizing is to determine the minimum acceptable internal diameter (ID) to ensure efficient fluid transport.
$$ t = \fracP D2 (SEW + PY) $$
In process piping, you cannot size a pipe for flow rate without immediately verifying if that pipe can handle the operating pressure and temperature.
Application of the Continuity equation, Bernoulli's equation, and basic fluid flow equations to determine pipe sizing and recommended velocities for various mediums like water and steam. Hydraulic Calculations: Density = 62