The H-Factor

Reducing Entropy

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Recently our previous blog service (Typepad) ended their business – so, we have a new home. It will take a bit to get images back and displaying properly, but we are working on it! Final pageview count of original Typepad blog: 387,232

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Using a Non-Standard Pipe Type in HydraCALC

A customer called today asking how to enter a 1″ black plastic underground pipe for the calc. This particular situation sounded unique enough that I did not tell him to add that pipe type to our database, as I would have if he expected to see this pipe type used repeatedly. I told him to…

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Using the Hydratec Software Download Area

Hydratec uses ShareFile to distribute our software installs and updates. New customers, or those without access, must request access to be able to get at these downloads. Access is only available to customers with a Hydratec subscription or those on an update plan. You can access the download area and request access by picking the…

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September 2006
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about

Darcy – Who?

Darcy-Weisbach. It's a phrase you are probably hearing more and more of. What is it? It is a formula for calculating friction loss just like Hazen-Williams. But whereas Hazen-Williams is used for water in sprinkler pipe, Darcy-Weisbach can be used for any liquid (including water, but NFPA 13 does not permit its use).

Its recent popularity is due to new fluids that have been produced for use in antifreeze systems. In order to calculate these systems you will need to know some things about the fluid being used, specifically the Density and the Viscosity. The Density is in the units of lbs per cubic foot (kg per cubic meter) and the Viscosity is the units of centipoise. These need to be entered in the appropriate spots in the calculation dialog box.

D-W

For more information on Darcy-Weisbach vs. Hazen-Williams see a great comparison article from Scott Martorano of The Viking Group in PDF form at: Darcy-Weisbach Article

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