That was my understanding also and so having a return bend on the line would accomplish nothing more in that respect than would occur normally.
On Thu, May 8, 2008 at 6:51 AM, Mark Sornsin <[EMAIL PROTECTED]> wrote: > In the case of the dry system, however, they also serve the purpose (I > believe) to keep water out of the drop. Once the water enters the drop, > it's trapped and will eventually corrode the pipe - sometimes to the > point of sealing the entire diameter. > > In the case of a riser nipple on a branch line, the air in the branch > line will compress enough to allow water into the line, and thus will > likely enter the drops - for eternity, or until the drop is drained. > > Mark A. Sornsin, PE > Fire Protection Engineer > Ulteig Engineers, Inc. > Fargo, ND > 701.280.8591 > [EMAIL PROTECTED] > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of A.P.Silva > Sent: Thursday, May 08, 2008 8:34 AM > To: [email protected] > Subject: RE: Return Bends > > I know it doesn't seem right. But is it achieving its intent? Return > bends > are used to prevent scale and other sediments being trapped at the head. > To > some extent, at least except from the individual branchline, won't this > be > achieved? > > Tony > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Garth W. > Warren > Sent: May 8, 2008 5:07 AM > To: [email protected] > Subject: Re: Return Bends > > what is being proposed to you is a line on a riser nipple off of the > main > NOT return bends. The return bend is there for a reason and what is > being > proposed to you does not serve the purpose. The suggestion should be > rejected. > > Garth > > ----- Original Message ----- > From: "A.P.Silva" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Wednesday, May 07, 2008 11:08 PM > Subject: Return Bends > > >> I have a situation, dry system running in heated space below the attic > in >> part of the building. In other parts, within the attic space. Where it > is >> running in the heated area, sprinklers are pendent type. So the need > for > dry >> pendents or return bends. The contractor doesn't want to install > individual >> return bends for each pendent head (for cost reasons). Instead he is >> proposing to make the entire branchline as the return bend. The > branchline >> to have a riser at the connection to the main. Then from the > branchline > drop >> down directly to each pendent head. Any problems? >> >> Tony >> >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum >> >> To Unsubscribe, send an email > to:[EMAIL PROTECTED] >> (Put the word unsubscribe in the subject field) >> > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email > to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email > to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) > -- Ron Greenman at home.... _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
