You also need the rated rpm, i.e. 100 psi @ 2000 rpm r=v/2*pi*f (radius ft= velocity / 2*pi* revolutions per second) h= 100/.433= 231. v = 2gh^.5 = 122. f= 2000/60= 33.33. the diam of this impeller would be closer to 14" than to 10". (how about 'no life brad', no comma)
-----Original Message----- From: Tom Duross [mailto:[email protected]] Sent: Monday, September 20, 2010 3:31 PM To: [email protected] Subject: RE: Monitor nozzle G, there was no comma between super and man. Brad, an old pump guy once told me, if you don't know the size of the impeller, take the square root of the rated head of the pump, it's usually close. Now, that isn't really accurate, but easy. Tom As opposed to 'wow, there goes prolific brad'? Just out of curiosity, is there supposed to be a comma between amazing and brad? Or is there none there intentionally. :) the main reason I post anything is I want all other sprinks to say 'wow that's amazing brad'. Once I put gravity back into the formulas and used feet and seconds only, I gained a tremendous amount of sprinkler calc confidence-- now I can use derived formulas and look-up tables most of the time- but am able to get from one thing to another logically in any rare situations. Yeah besides that .98/.97 really only works in the theory world. When the fitter drops the nozzle installing it, do you think he'll ever admit it's egg shaped with that big gouge in it cause he dropped it. Especially if no one notices. What's it's CD now? .821365798213465????? Seriously, how many of us were staying up at night this weekend, worrying about the .97 vrs .98? Your nozzle must be fundamentally different :) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.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 [email protected] http://fireball.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)
