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]
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