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  2. Hazen–Williams equation - Wikipedia

    en.wikipedia.org/wiki/HazenWilliams_equation

    The HazenWilliams equation is an empirical relationship that relates the flow of water in a pipe with the physical properties of the pipe and the pressure drop caused by friction. It is used in the design of water pipe systems [ 1 ] such as fire sprinkler systems , [ 2 ] water supply networks , and irrigation systems.

  3. Hydraulic head - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_head

    The most common equation used to calculate major head losses is the Darcy–Weisbach equation. Older, more empirical approaches are the HazenWilliams equation and the Prony equation. For relatively short pipe systems, with a relatively large number of bends and fittings, minor losses can easily exceed major losses.

  4. Pipe network analysis - Wikipedia

    en.wikipedia.org/wiki/Pipe_network_analysis

    Given a starting node, we work our way around the loop in a clockwise fashion, as illustrated by Loop 1. We add up the head losses according to the Darcy–Weisbach equation for each pipe if Q is in the same direction as our loop like Q1, and subtract the head loss if the flow is in the reverse direction, like Q4.

  5. Darcy–Weisbach equation - Wikipedia

    en.wikipedia.org/wiki/Darcy–Weisbach_equation

    The head loss Δh (or h f) expresses the pressure loss due to friction in terms of the equivalent height of a column of the working fluid, so the pressure drop is =, where: Δh = The head loss due to pipe friction over the given length of pipe (SI units: m); [b]

  6. Friction loss - Wikipedia

    en.wikipedia.org/wiki/Friction_loss

    The friction loss is customarily given as pressure loss for a given duct length, Δp / L, in units of (US) inches of water for 100 feet or (SI) kg / m 2 / s 2. For specific choices of duct material, and assuming air at standard temperature and pressure (STP), standard charts can be used to calculate the expected friction loss.

  7. 9 Antique Items You Could Sell for Thousands of Dollars

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    Coins worth a lot of money include the 1933 Double Eagle, 1794 Flowing Hair Dollar, 1787 Brasher Doubloon, 1861 Paquet Liberty Head Double Eagle and 1913 Liberty Head Nickel. First Edition Books

  8. Hardy Cross method - Wikipedia

    en.wikipedia.org/wiki/Hardy_Cross_method

    4. The total clockwise head loss in loop 1-2-3 is =. The total clockwise head loss in loop 2-3-4 is =. 5. The value of is determined for each loop. It is found to be 60 in both loops (due to symmetry), as shown in the figure. 6.

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    Ditch the cable TV, fast-food lunches, and maybe even your car if possible, and you’ll find yourself money ahead (and maybe debt-free) in no time.