Design pipes so that pressure drop is roughly 2.3 Sizing by Economical Velocity
) is calculated, mill tolerance must be added. Pipe manufacturers are typically allowed a tolerance on wall thickness during production.
P = 11.4 bar
). It is determined using the implicit or found visually on a Moody Diagram . The Hazen-Williams Equation
: Final thickness selection must include additional "mill tolerance" (typically 12.5%) and "corrosion allowance" to ensure the pipe remains safe throughout its life. CEDengineering.com 3. Key Concepts Summary Table Key Variable/Standard Reynolds Number Determine flow regime Fluid viscosity and velocity Friction Factor Calculate energy loss Moody Diagram or Colebrook equation Hoop Stress Determine radial stress Internal pressure and wall thickness Pipe Schedule Standardized thickness ASME B36.10 (Steel) or B36.19 (Stainless) Final Result Design pipes so that pressure drop is roughly 2
: Establishing preliminary sizes based on industry-standard velocity limits (e.g., 1–4.5 m/s for liquids) to prevent erosion, noise, and water hammer. Pressure Drop Constraints
: Accounts for pressure drops in valves and fittings using the Equivalent Length Recommended Velocities It is determined using the implicit or found
A typical design workflow begins with a required mass or volumetric flow rate for a new process line.
If you want to customize this technical documentation, let me know: 2.1 Velocity Limitations For steady-state flow
) of a pipe based on flow rate, velocity limitations, and allowable pressure drop. 2.1 Velocity Limitations
For steady-state flow, mass is conserved. For incompressible fluids (liquids), the volumetric flow rate remains constant: Q=A×vcap Q equals cap A cross v = Volumetric flow rate ( = Cross-sectional area of the pipe ( = Mean fluid velocity ( 2. Pipe Sizing Methodology