Return bends where main frames, media, etc., are located.įrom: Sprinklerforum Behalf Of Lamar Vaughn Not a direct answer to the original post but even if I could, I wouldn't use You have to trip these valves so everything will get wet The client was very nervous about having ANY water in the drops, even underģ0 PSI of air. We have the 911 room for Boston Police at their headquarters and afterĭraining each and every return-bend head off their 2 preaction systems last This email has been scanned by the Symantec Email Security.cloud service. You could also face corrosion issues if you have drops that are filled with water. To: RE: Pendent sprinklers on return bends on a pre-action system | Fire Protection Engineer | Fargo, ND | direct: 701.552.9905 | mobile: 701.371.5759 | įrom: Sprinklerforum On Behalf Of Matt Grise A 'rust plug' had formed across the entire cross section of the drop. We have seen drops corroded shut on ferrous pipe due to water that was left within after testing (or a trip or whatever). My understanding is pipe must still be pitched and return bends required.Ĭorrosion is a real possibility. To: Re: Pendent sprinklers on return bends on a pre-action system (5) Pendent sprinklers and sidewall sprinklers, where the sprinklers and branch line piping are in an area maintained at or above 40☏ (4☌), the water supply is potable, and the piping for the preaction system is copper or CPVC specifically listed for dry pipe applicationsįrom: Sprinklerforum On Behalf Of Travis Mack (4) Horizontal sidewall sprinklers, installed so that water is not trapped (3) Pendent sprinklers and sidewall sprinklers installed on return bends, where the sprinklers, return bend, and branchline piping are in an area maintained at or above 40☏ (4☌) The following sprinkler orientations and arrangements shall be permitted for preaction systems: See (5) below for pendent conditions without return bends on preaction systems otherwise see (3).ħ.3.2.5 Sprinklers.
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