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The link works only a few times then you need to log in. Removed. —Preceding unsigned comment added by 194.105.120.80 ( talk) 15:16, 31 May 2010 (UTC) reply

The equation for solving the pressure drop is wrong. Please refer to the Pressure drop form at http://en.wikipedia.org/wiki/Darcy%E2%80%93Weisbach_equation. (the current equation results in an error of factor 4). — Preceding unsigned comment added by 130.237.61.10 ( talk) 13:04, 23 October 2012 (UTC) reply

Can someone add the simple english version please? Pretty please. — Preceding unsigned comment added by 185.46.212.175 ( talk) 08:53, 28 November 2018 (UTC) reply