So, after each full trip test or fire within a building you think the owner will pay to have fitters or someone go in and redrain ALL drops on the system and reinstall them? Let's say even if there is absolutely no water damage or damage to tiles or anything else that may be in the building and if the owner had no use intended for any of those areas for that day.... If you do, I want to work for you doing trip tests...lol
Garth ----- Original Message ----- From: "Mark Sornsin" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, May 08, 2008 12:41 PM Subject: RE: Return Bends But I would argue it is NOT o.k. to trap water in a drop - heated or otherwise. We have seen examples of drops with trapped water, where at the water/air interface, scale developed to the point of total blockage. Which brings up the point - what do you do for the 200 psi hydro-test? Either you drain all return bends; or test using plugs, then install sprinklers without the 200 psi hydro. Which is correct? Either way, the sprinklers are installed or re-installed without the benefit of the 200 psi hydro. 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 11:02 AM To: [email protected] Subject: RE: Return Bends That is my understanding also. When the piping undergoes the 200 psi pressure test, all drops (return bends or otherwise) would trap water, which is okay as it is in a heated area. As far as I know, no one drains the drop of a return bend. So I think it would be safe to say the intent of the return bend is to minimize "creeping crud and corrosion". So the question is: would the riser nipple at the main also achieve this? I know, the junk from the individual branchline can get deposited at the orifices. But the riser nipple will isloate the rest of the system. Any thoughts? Tony -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Brown (TECH- GVL) Sent: May 8, 2008 7:51 To: [email protected] Subject: RE: Return Bends As I remember the return bend was to help insure that creeping crud and corrosion does not build up on the orifice inlet of the sprinkler and cause problems with the operation of the sprinkler. Or maybe I am just getting brain hiccups. Michael L. Brown Manager of Technical Services The Reliable Automatic Sprinkler Company, Inc.' [EMAIL PROTECTED] www.reliablesprinkler.com (864) 843-5228 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of A.P.Silva Sent: Thursday, May 08, 2008 9:34 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) _______________________________________________ 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)
