The beatings will continue until the viscosity changes. Ron Fletcher
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Roland Huggins Sent: Thursday, September 18, 2008 12:29 PM To: [email protected] Subject: Re: viscosities Since the intent is to more accurately assign an estimated friction loss and the colder it gets, the greater the loss. Go with the lowest temperature. Now if you were attempting to use this for a wet pipe system instead of Hazen-Williams then it is a great question and answers why we don't otherwise use Darcy-Weisbach (loses the flaunted greater accuracy since the variables are not constant). Sure as the sky is falling, some sprinkler scientist will say when using a tank, you have to calc for pipe size based on lowest temp but tank size based on highest temp. Sometimes a good beating is called for. Roland On Sep 18, 2008, at 11:06 AM, Travis Mack, SET wrote: > Ok..another viscosity question. > > When using HydraCalc to calculate antifreeze systems using the Darcy > method, > it asks for viscosities of solutions. I have a data sheet with the > viscosities at various concentrations and various temperatures. My > question > is, do you use the average daily minimum temperature for an area, or > the > extreme daily minimum for an area? For this particular project, the > difference is 40°F in the 2 temperatures. With the average daily > minimum > temperature, the system works with the available pressure. With the > extreme > daily minimum, the city supply is not even close. There is a 100+ > psi swing > in the demands. > > So, do we go with average minimums, or extreme minimums? > > There is always the option to go to a dry system, but the increased > design > areas and reduced c factor will also force a pump on this project. An > anti-freeze system at average daily minimum works without a fire pump. > However, we don't want to design/install an inadequate system. > > > Please feel free to call if you have any questions or comments. > > Travis Mack, SET > MFP Design, LLC > 2508 E Lodgepole Dr > Gilbert, AZ 85298 > 480-505-9271 > [EMAIL PROTECTED] > > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: [EMAIL PROTECTED] > > To Unsubscribe, send an email to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [EMAIL PROTECTED] To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [EMAIL PROTECTED] To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
