Note! The hydraulic diameter is not the same as the equivalent diameter. The equivalent diameter is the diameter of a circular duct or pipe that gives the same pressure loss as a rectangular duct or pipe.
Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes and more.
The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.
A major friction loss diagram for air ducts - Imperial units ranging 10 - 100 000 cfm.
Head loss or major loss in air ducts - equations and online calculator for rectangular and circular ducts - Imperial and SI units.
Friction loss coefficients in pipes, tubes and ducts.
The Darcy-Weisbach equation can be used to calculate the major pressure and head loss due to friction in ducts, pipes or tubes.
Calculate velocities in circular and rectangular ducts - imperial and SI-units - online calculator.
Circular ducts sross-sectional areas.
Calculate pressure loss - or head loss - in ducts, pipes or tubes.
Minor pressure and head loss in pipes vs. equivalent length in tubes and duct systems.
Geometric relationships like area, wetted perimeter and hydraulic diameter.
Convert rectangular and oval duct geometry to a equivalent circular diameter - online calculator with imperial and SI-units.
The Hazen-Williams equation can be used to calculate the pressure drop (psi) or friction loss in pipes or tubes.
Major and minor loss in pipes, tubes and duct systems.
Calculate hydraulic diameter for rectangular ducts - metric units.
Introduction and definition of the dimensionless Reynolds Number - online calculators.
Reynolds number for clean cold water flow.
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