Engineering guides and tutorials
Practical guides on pipe flow calculations, friction factors, and fluid mechanics. Written for engineers and students.
How to Read the Moody Chart: A Step-by-Step Guide
Read the Moody chart and find the Darcy friction factor for any pipe flow condition. Step-by-step, with flow regimes and worked calculations.
Reynolds Number Explained: Laminar vs Turbulent Flow
What Reynolds number is, how to calculate it, and what laminar vs turbulent means for your pipe design. Worked examples and a fluid reference table.
Pipe Roughness & Relative Roughness: An Engineer's Guide
Absolute roughness values for every common pipe material, how to calculate relative roughness, and how aging changes both. With worked examples.
Colebrook-White vs Swamee-Jain: Which Formula to Use
Colebrook-White is exact but implicit; Swamee-Jain is explicit but approximate. When each is accurate enough, and which to use for your calculation.
Darcy-Weisbach vs Hazen-Williams: Which to Use
Darcy-Weisbach handles any fluid; Hazen-Williams only water at moderate velocity. Where each applies, with side-by-side worked calculations.
Moody Chart in Practice: HVAC, Water Supply & Pipelines
How engineers use the Moody chart on real projects: HVAC duct sizing, municipal water mains, and oil pipelines, with a worked example from each.
How to Calculate Reynolds Number: Worked Examples
A practical walkthrough for calculating Reynolds number from scratch. Three worked examples - water in a pipe, air in a duct, and viscous oil - with common unit mistakes to avoid and what to do with your result.
Pipe Pressure Drop: The Complete Engineer's Guide
Everything you need to calculate pressure drop in pipes using the Darcy-Weisbach equation. Covers major and minor losses, friction factor, worked examples, and why pipe diameter matters more than anything else.
Pipe Flow Velocity: How to Calculate It and Why It Matters
Learn how to calculate pipe flow velocity from flow rate and diameter, what velocity ranges are safe for different applications, and how velocity connects to Reynolds number, pressure drop, and system design.
How to Calculate Pump Power: A Practical Engineering Guide
Step-by-step guide to calculating pump power requirements. Covers hydraulic power, shaft power, pump efficiency, total dynamic head, and how to select the right motor size for your application.
Kinematic vs Dynamic Viscosity: Difference and When to Use
Plain-English explanation of viscosity for pipe flow engineers. Learn what kinematic and dynamic viscosity mean, why Reynolds number uses kinematic viscosity, and how to look up the right value for your fluid.