But if it's a 90 year old system, then they most likely used Cast Iron Tee's on the mains as well and every section of pipe will trap water.
T -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: Friday, August 27, 2010 1:26 PM To: [email protected] Subject: RE: dry main low point drains 90 year old system, 250 ft long building. Have to remove about 1/2 of branch lines and re-do riser nipples and cut riser to pitch main. Messing with an old system can be a recipe for disaster. If you did one for every pipe size, this would require 8-10 drum drips, which could be made up in the shop and connected to the main with mechanical tees. Sounds a whole lot easier and cheaper to me. This owner has a good track records maintaining systems. At 02:17 PM 8/27/2010, you wrote: >There used to be a "Manifold drain" allowed for very small DP systems with >like 1" branch lines. I think that now it's called "Tie-in Drains" >8.16.2.5.3.5 anyway it's still for trapped branch lines. If the drains, One >for each pipe section of main are not "Too Much Money" why would >"Re-hanging" the main be too much? I'd rather re-hang 40 pieces of main than >pipe 40 drum drips to it and then have to rely on the owner to service them >"As Required" > >T. > >_______________________________________________ >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) Todd G. Williams, PE Fire Protection Design/Consulting Stonington, CT 860.535.2080 www.fpdc.com _______________________________________________ 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)
