Sizing is an iterative process aimed at balancing capital costs with operational efficiency. Velocity Criteria
Process fluids often corrode metal. An extra thickness (e.g., 3mm) is added to the calculated $t$ to account for material loss over the plant's lifespan. $$t_required = t_calculated + \textCorrosion Allowance$$
Too high velocity causes pipe wall erosion, especially at elbows.
Testing, inspection, and safety margins
) of a pipe based on flow rate, velocity limitations, and allowable pressure drop. 2.1 Velocity Limitations
To determine the flow regime scientifically, engineers calculate the dimensionless Reynolds Number using the formula:
: Sizing begins with the Continuity Equation , is flow rate, is cross-sectional area, and is velocity. Flow Regimes : The Reynolds Number ( ) determines if flow is laminar ( ) or turbulent ( ), which dictates the method for calculating friction. Pressure Drop Calculations : Sizing is an iterative process aimed at balancing
Learn how the relationship between Pressure and Temperature impacts material selection and flange ratings (ASME B16.5).
Properly sizing process piping is a cornerstone of industrial design, directly impacting plant safety, efficiency, and capital costs. This module covers the critical calculations and standards required to determine optimal pipe diameters and verify that selected materials can withstand operating pressures according to . 1. Fundamental Hydraulics and Flow Equations
) for straight pipe under internal pressure, ASME B31.3 utilizes the following formula: Flow Regimes : The Reynolds Number ( )
: The fundamental relationship used to calculate pipe area based on flow rate and velocity is: Q=A×vcap Q equals cap A cross v is the flow rate, is the cross-sectional area, and is the flow velocity.
The you are modeling (liquid, gas, two-phase?)
: As the pipe schedule increases, wall thickness grows to handle higher pressures, reducing the internal diameter. 3. Standards and Safety Factors Process Piping Fundamentals, Codes and Standards The you are modeling (liquid