Confirm velocities fall within non-erosive and non-settling limits.
A typical Module 3 problem will give:
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Frictional losses occur not only in straight pipes but also due to disruptions caused by valves, tees, elbows, and expansions. These are called "minor losses" but can constitute a significant portion of total pressure drop. They are calculated using two primary methods: These are called "minor losses" but can constitute
Proper sizing balances initial capital investment (pipe cost) with operating expenses (pump energy costs). 3.1 Velocity Limits
The primary method for calculating frictional head loss in a pipe is the Darcy-Weisbach formula:
$$ Re = \frac\rho v D\mu \quad \textor \quad \fracv D\nu $$ Pressure Drop Equations
Maintaining fluid velocity within standard industrial limits prevents operational issues like erosion, water hammer, noise, and excessive pressure drop. Fluid Type Recommended Velocity Range (m/s) Recommended Velocity Range (ft/s) 0.5 – 1.5 1.5 – 5.0 Pump Discharge (Liquid) 1.5 – 3.0 5.0 – 10.0 Gases / Steam (Low Pressure) 15.0 – 30.0 50.0 – 100.0 Gases / Steam (High Pressure) 30.0 – 60.0 100.0 – 200.0 Step 2: Calculate Continuity Equation
For process plants, many engineers follow the "rule of thumb": (~2–4 psi per 100 ft) for liquids.
Piping hydraulics dictate how a fluid behaves as it moves through a processing plant. Understanding these core fluid behaviors is the first step in successful system design. Fluid Properties Density ( and excessive pressure drop.
Comprehensive Guide to Process Piping Hydraulics: Sizing and Pressure Rating Introduction to Process Piping System Design
): Inertial forces dominate. Fluid particles move in highly irregular, chaotic paths, leading to rapid mixing and higher energy dissipation. Most industrial process piping operates in this regime. Pressure Drop Equations