Module 3 Process Piping Hydraulics Sizing And Pressure Rating Pdf

Summary

-factor): Expresses head loss as a fraction of velocity head:

Elbows, tees, and valves introduce additional pressure drops, often calculated using the equivalent length method. Summary -factor): Expresses head loss as a fraction

Once the pipe size is selected, you must ensure it can withstand its internal pressure without failing. This is the pressure rating section of the module. The primary tool for this is the (applicable to petroleum refineries, chemical plants, pharmaceutical plants, etc.).

[ t = \fracP \cdot D2(SEW + PY) ]

A solid review of this module highlights three primary areas:

[ Q = A_1 v_1 = A_2 v_2 ]

Pressure rating ensures the pipe can contain the maximum expected internal stress without failure. Design Pressure vs. Operating Pressure

To prevent issues like erosion, cavitation, and excessive noise, industrial standards recommend specific velocity ranges: Fluid Type Recommended Velocity Range (m/s) Recommended Velocity Range (ft/s) 0.6 – 1.2 2.0 – 4.0 Water (Pump Discharge) 1.5 – 2.5 5.0 – 8.0 Steam (Saturated) 30.0 – 40.0 100.0 – 130.0 Steam (Superheated) 40.0 – 60.0 130.0 – 200.0 Gases (Low Pressure) 15.0 – 30.0 50.0 – 100.0 3. Calculating Hydraulic Pressure Drops The primary tool for this is the (applicable

tm=t+c+mechanical_allowancest sub m equals t plus c plus m e c h a n i c a l _ a l l o w a n c e s = Corrosion, erosion, or threading allowance (