I don't know how many times I've sat and thought about what's happening between the suction and discharge flanges of a horizontal, split-case centrifugal. I know half the water goes left and half goes right, and the diameter of the eyes is usually less than half the suction, so the water speeds up and, with the higher velocity comes a lower heat of vaporization so if it sounds like you are pumping gravel don't worry, it is not air bubbles popping, it is water in the vapor state bubbles popping. Brad On May 18, 2016 8:57 PM, "Brad Casterline" <[email protected]> wrote:
> You need a demand, no? Highest outlet times .433 equals so many psi, plus > end head, friction loss in the pipe, backflow, and underground. It helps to > know where the cut-off points for horsepower are though, price-wise, when, > thinking, "hey I just need 120 but I'll say 146 because that's still less > than 175". PSI vs GPM both do affect horsepower, but I think psi goes in > smaller increments than gpm. > On May 18, 2016 8:39 PM, "Parsley Consulting" <[email protected]> > wrote: > >> When I've been assigned to teach NFPA 20 for AFSA the presentation >> includes a very simple process for sizing a fire pump. >> >> >> *Ken Wagoner, SET Parsley Consulting* >> >> >> >> * 350 West 9th Avenue, Suite 206 Escondido, California 92025 Phone >> 760-745-6181 <760-745-6181> Visit our website >> <http://www.parsleyconsulting.com/> * >> On 05/18/2016 4:02 PM, Roland Huggins wrote: >> >> I did an article in Sprinkler Age way back in the 90s on sizing pumps. >> The methodology hasn’t changed other than newer equipment like variable >> speed drivers but it’s still a good starting for for the basics. >> >> Roland >> >> >> Roland Huggins, PE - VP Engineering >> American Fire Sprinkler Assn. --- Fire Sprinklers Saves Lives >> Dallas, TX >> http://www.firesprinkler.org >> >> >> >> On May 18, 2016, at 12:23 PM, Zachary Siegrist < >> [email protected]> wrote: >> >> Is there an equation to specify an appropriate pressure when sizing a >> fire pump? For example, when sizing gpm, I've always taken the GPM >> available at 20 psi divided by 1.5 to give me the maximum GPM rating of the >> pump. I'm inquiring to see if such a formula is available to size the >> pressure correctly. Can anyone help? >> >> Zach Siegrist >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >> >> >> >> >> _______________________________________________ >> Sprinklerforum mailing >> [email protected]http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >> >> >> >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >> >>
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