Hazen-Williams equation: head loss (ft per 100 ft) for water in pipe.
Hydraulic engineering calculator and reference for pipe head loss, flow rate, velocity, Reynolds number, pump selection and pipe sizing.
Read our guidesMaster essential hydraulic calculations for pipe flow, pressure drop, pump sizing, and system design with practical formulas, tools, and real-world examples.
Read more →A detailed comparison of the Hazen-Williams and Darcy-Weisbach equations for calculating friction loss in pipe flow, including accuracy, applicability, and practical recommendations for engineers.
Read more →Learn the recommended velocity limits for water and other fluids in piping systems. This article covers industry standards, general guidelines, and the effects of high and low velocities including erosion, water hammer, and sedimentation.
Read more →Learn step-by-step methods to compute the Darcy-Weisbach friction factor using the Moody chart, Colebrook equation, and Swamee-Jain formula for pipe flow analysis.
Read more →Understand the relationship between specific gravity and density for water, oils, chemicals, and hydraulic fluids. Includes conversion formulas and a reference table with common fluid values at standard temperatures.
Read more →Understand how fluid viscosity varies with temperature, its impact on hydraulic systems, and practical methods to account for it in design and operation.
Read more →Learn how to calculate the Reynolds number to determine whether flow is laminar, transitional, or turbulent. Includes formulas, practical examples, and guidance for piping systems.
Read more →A comprehensive reference table and guide to Hazen-Williams C coefficients for common pipe materials, including PVC, ductile iron, steel, concrete, and HDPE. Learn how pipe age, diameter, and joints affect the C value for accurate hydraulic calculations.
Read more →Water hammer is a pressure surge caused by sudden fluid velocity changes. This article explains the physics, provides calculation methods (Joukowsky equation), and discusses prevention measures like surge tanks and slow-closing valves.
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