Talk:Hazen-Williams equation

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So much for the SI units... 62.242.0.66 09:35, 24 April 2006 (UTC)

HELLO EVERYBODY, this is an important formula, for water in a pipe. I object because this article does not mention the LENGTH of the pipe. There should be variable "L" added to the formula, if the pipe is 231 feet long, then L=231. Most people will want to know the pressure drop for the whole pipe, not just "per foot". I think this formula is only for "Unit length" of pipe, i.e. pressure drop for 1 foot. But I didn't do the math, can't somebody fix this up? As to SI vs English units, sure make a separate formula thats metric, but for the whole continental USA there's plenty of gallons per minute, and feet of pipe, etc. —Preceding unsigned comment added by 208.32.186.35 (talk) 20:51, 12 October 2007 (UTC)

There is no L in this formula, and there's not supposed to be one... this is an established formula and it doesn't need to be changed simply because you think it should be. The Hazen-Williams formula determines pressure loss due to friction PER FOOT (which is noted in the article)... The answer is measured in psi/ft technically. It gets bastardized (especially in the fire protection industry) and dumbed down to simply "psi" even tho that is technically incorrect and the units are, as I said, technically psi/ft. You then, obviously, multiply the answer by the length of the pipe in feet to attain the total pressure loss due to friction in a given length of pipe measured in psi. Again, the Hazen-Williams formula is not meant to give you the total pressure loss due to friction in a given length of pipe... it is meant to give you the total pressure loss due to friction PER FOOT in any pipe.76.116.14.38 (talk) 01:03, 20 February 2008 (UTC)

[edit] Only in America?

The article lead implies that this equation is not used outside America. If that is true then it's somewhat bizarre and worth some mention (and a citation). If it's not true, then the word "America" is misleading and needs to be removed. Anyone got an answer? • TheBendster (talk) 2 May 2008, 17:56 (UTC)

OK, I removed it. • TheBendster (talk) 6 May 2008, 11:31 (UTC)