Module 3 Process Piping Hydraulics Sizing And Pressure Rating Pdf

What are you transporting, and what is its flow rate ?

Once diameter is chosen, select the based on design pressure and temperature.

Teaches pipe sizing using fundamental fluid flow equations (e.g., Darcy-Weisbach or Hazen-Williams) to manage .

): Fluid flows in parallel layers with minimal mixing. Common in highly viscous fluids. Transitional Flow (

| Fluid Type | Velocity Range (m/s) | Velocity Range (ft/s) | |------------|----------------------|------------------------| | Pump suction (low NPSH) | 0.6 – 1.5 | 2 – 5 | | Pump discharge (general) | 1.5 – 3.0 | 5 – 10 | | Steam (low pressure) | 20 – 40 | 65 – 130 | | Compressed air | 10 – 25 | 33 – 82 | | Erosive fluids (slurries) | < 3 | < 10 | | Corrosive fluids | < 1.5 | < 5 | What are you transporting, and what is its flow rate

is a critical technical resource for engineers focused on the mechanical integrity and fluid dynamics of industrial piping systems. It bridge the gap between process requirements and physical pipe design, primarily utilizing ASME B31.3 as the governing code. Core Technical Pillars

Compute the total friction loss across the run, including valves and fittings using equivalent length methods ( Leqcap L sub e q end-sub 3. Pressure Rating and Wall Thickness Calculation

Pressure-integrity design determines the and the pressure ratings for in-line components like flanges and valves. Process Piping Fundamentals, Codes and Standards

to identify flow regimes (laminar vs. turbulent) and pipe roughness. Sizing Methodology Determine required Flow Rate (Q) Select target velocity and calculate preliminary ): Fluid flows in parallel layers with minimal mixing

Choose an acceptable velocity range based on fluid properties.

: Accounts for pressure drops in valves and fittings using the Equivalent Length Recommended Velocities

Flanges are categorized into specific pressure classes (Class 150, 300, 600, 900, 1500, 2500). The maximum allowable working pressure of a flange decreases as its operating temperature increases.

= Coefficient valid for specific materials and temperature ranges Total Nominal Wall Thickness It bridge the gap between process requirements and

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Re=ρvDμcap R e equals the fraction with numerator rho v cap D and denominator mu end-fraction = Fluid density = Fluid velocity = Inside diameter of the pipe = Dynamic viscosity Fluid flows in parallel layers with minimal mixing. Critical/Transitional Flow (

= Darcy friction factor (determined via the Moody Chart or Colebrook-White equation) = length of the pipe = internal diameter of the pipe = fluid velocity = gravitational acceleration Fitting and Valve Losses (Minor Losses)

Once the hydraulic sizing establishes the necessary inside diameter, the pipe's mechanical integrity must be verified to safely contain the internal process pressure. Piping Codes