Module 3 Process Piping | Hydraulics Sizing And Pressure Rating Pdf Exclusive

The allowable pressure drop is typically dictated by the available "energy budget" of the pump or compressor. In most process plants, a rule of thumb is a pressure drop of 1–2 psi per 100 feet of pipe. 3. Pressure Rating and Wall Thickness

All hydraulic analysis begins with the principle of conservation of mass. The (Q = A x v) dictates that for a fluid with constant density, the volumetric flow rate remains constant. Consequently, as the cross-sectional area (A) of a pipe changes, the velocity (v) changes inversely.

= Weld joint strength reduction factor (primarily for high-temperature creep ranges)

) is not the final thickness specified for procurement. Engineers must factor in environmental degradation and manufacturing variances: The allowable pressure drop is typically dictated by

Maintaining fluid velocity within standard industrial limits prevents problems like erosion, noise, water hammer, and static electricity buildup. Fluid Type Typical Velocity Range (m/s) Typical Velocity Range (ft/s) Pump Suction (Liquids) 0.5 – 1.5 1.5 – 5.0 Pump Discharge (Liquids) 1.5 – 3.0 5.0 – 10.0 Gravity Flow lines 0.1 – 0.5 0.3 – 1.5 High-Pressure Steam 30.0 – 50.0 100.0 – 160.0 Low-Pressure Steam 20.0 – 30.0 65.0 – 100.0 Gases / Vapors 15.0 – 30.0 50.0 – 100.0 2. Pressure Drop Constraints

Rearrange the continuity equation to find the internal cross-sectional area:

[ t_m = t + c ] Where ( t = \fracP \times D2(SEW + PY) ) Pressure Rating and Wall Thickness All hydraulic analysis

) to withstand internal pressure is calculated using the following code formula:

Do the piping class ratings match the pressure-temperature ratings specified in ASME B16.5?

Once the internal diameter is fixed, the pipe wall thickness must be determined to safely contain the internal design pressure. Process piping design in industrial plants typically governs under . ASME B31.3 Wall Thickness Formula = Weld joint strength reduction factor (primarily for

Use industry standards or company criteria to establish upper and lower limits.

0.1% to 1% of the upstream absolute pressure per 100 meters. Step-by-Step Pipe Sizing Procedure

These exclusive documents are typically found in:

= Corrosion, erosion, or mechanical threading allowance (typically for carbon steel). tolerancetolerance