Talk:Hazen–Williams equation

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

message: 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)
replies: text: 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)
thread_title:  Formula 

message: 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)
=== d is in mm ===
The way it is custom to use in Israel is the following:
hf(m)=1.131*10^12((Q(m^3/hr)/c)^1.852)(d(mm)^-4.87)L(km)
Where Q is the flow rate, d is the pipe's diamater and L is the pipe's length, in the article it was written that d is in meters.  —Preceding unsigned comment added by 84.229.239.234 (talk) 18:03, 8 July 2010 (UTC)
thread_title:  Only in America? 

message: The way it is custom to use in Israel is the following:
hf(m)=1.131*10^12((Q(m^3/hr)/c)^1.852)(d(mm)^-4.87)L(km)
Where Q is the flow rate, d is the pipe's diamater and L is the pipe's length, in the article it was written that d is in meters.  —Preceding unsigned comment added by 84.229.239.234 (talk) 18:03, 8 July 2010 (UTC)
thread_title:  d is in mm 

message: The original formula P(psi) = 10.44 * Q^1.85/ C^1.85 * d^4.84 is incorrect, as this provides pressure in *feet of water*, and not psi.
For psi the correct formula is P(psi) = 4.52 Q^1.85 / C^1.85*d^4.84.  The difference in this constant is the conversion from psi to feet of water (2.307).
Luis H Palacios (talk) 20:38, 19 April 2013 (UTC)
thread_title:  Fixed error in formula 

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thread_title:  External links modified