Pressure limiting device Governor on the diesel to lower speed at churn so as not to exceed 170 PSI discharge pressure. Used when the water supply exhibits relatively high static and low residual, and you need 170 at rated capacity. See NFPA 20 2003 for first invocation against using the main relief valve to truncate the water supply down into the retention pond. The #20 TC was afraid the main relief could stick open, and your FP water is running out the relief valve instead of discharging thru open sprinklers. Clarke makes a line of variable speed diesels rather than the single RPM conventionals. This particular one had variable pitch vanes in the turbo to meet emissions standards. Due to a limited # of offerings in the line, especially in the larger sizes, this was oversized by maybe 250 HP or so. No time to visit archives today.
George L. Church, Jr., CET Rowe Sprinkler Systems, Inc. PO Box 407, Middleburg, PA 17842 877-324-ROWE 570-837-6335 fax g...@rowesprinkler.com -----Original Message----- From: sprinklerforum-boun...@firesprinkler.org [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of bcasterl...@fsc-inc.com Sent: Saturday, October 06, 2012 8:19 PM To: sprinklerforum@firesprinkler.org Subject: Re: Fire pump annual test on 2nd thought (calc), 65-70% is closer, I bet. 78% is 4500 @ 170. by the way, what does PLD stand for? Quoting bcasterl...@fsc-inc.com: > George, > 78% efficient at overload.. not too shabby! > Do you recall the rated RPM? If I assume a 14" impeller diam. I get 2600 RPM. > I thought about converting the 400 speed reduction to the pump room > temperature rise but said nahhh.. it would be negligible against the > 1st law of testosterone, Lol, brad > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.org > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
