Nope, won't work and just bad practice. I ran a quick calc, flowing as an example, 900 gpm through a 2" black carbon steel pipe at 109 fps, the pressure drop was 6.4 psi/ft of run. How are you going to overcome the excessive pressure drop or are talking about a real small section of pipe where this would occur?
Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540 Fax - 864.920.7129 CH2MHILL Extension 77540 [email protected] -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Alexandre Lupien Sent: Saturday, May 07, 2016 8:40 PM To: [email protected] Subject: Very high velocity in pipes For a retrofit project with a 40 years old sprinkler system. Would it be acceptable to have branch lines and main pipes at a water velocity of about 110 ft/s. A high rated fire pump would be added, but this would avoid replacing the small diameter piping in the existing tenant spaces. Is there risk of breaking the pipes at this velocity, or blocking the sprinkler system with debris dislodging from the existing pipes? Hydraulic calculations would not be accurate at this velocity but maybe a safety factor on the sprinkler demand could be added for this? Thanks Alex Lupien _______________________________________________ Sprinklerforum mailing list [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
