Which of the following is NOT a method for calculating friction losses?

• A. Darcy-Weisbach Equation
• B. Hazen-Williams Equation
• C. Reynolds Number method
• D. None of the above

Answer: (C)

The Reynolds Number method is primarily used to characterize fluid flow and determine whether a flow is laminar or turbulent. It does not directly calculate friction losses in pipelines. Instead, friction losses are typically calculated using empirical equations like the Darcy-Weisbach and Hazen-Williams equations, which are specifically designed to quantify energy losses due to friction in fluid flow through pipes.

The Darcy-Weisbach equation relies on the friction factor—which can be influenced by the Reynolds Number—to determine pressure loss due to friction, while the Hazen-Williams equation is empirical and directly relates the flow of water to pressure loss in a pipe based on its diameter and material characteristics. Therefore, while the Reynolds Number is significant in fluid mechanics, it does not serve as a method for calculating friction losses, making it the correct choice for this question.