To endorse, in the West we won’t confirm the sun has come up before coffee. Without coffee it’s not important if the sun is risen. Best. Bruce.
> On 07/03/2024 8:35 AM PDT Steve Leyton <[email protected]> wrote: > > > > Damn you guys – I’m not on vacation and was awake when Rick pinged as well. > This may come as a shock but we need our morning coffee and time to make > breakfast and #2 on the West Coast same as y’all. > > > > As they say, if you’re using an older edition of a standard want to confirm > or clarify the committee’s intent on a particular issue, look at the most > current edition of that standard. Moving from 2013 to 2016, there was a > subtle change in 7.5.3 where it was revised to say, “Where wet standpipes are > interconnected…”, so that clarifies the intent that it be applied to wet > only. There’s also 7.5.4 that states, “Dry standpipes shall have only a > single level of interconnection”, so looping a dry manual was taken off the > table. > > > > Jump ahead to 2024 and (renumbered) 9.4 has been simplified. 9.4.3 still > restricts dry standpipes to a single interconnection but overall, you can > interconnect at any level (unless the system is supplied by a rooftop tank), > no check valves are required, and with the AHJ’s approval standpipes don’t > need to be interconnected at all. > > > > When the committee opened discussion of the check valve requirement this past > cycle, we couldn’t figure out why that was even in the standard. It’s been > there for so long that it became inertial at some point, I guess. I/we have > gone over this quite a bit and, so long as there are sectional valves that > enable isolation of a standpipe, we couldn’t figure out why a check was > required. > > > > But I’m also concerned about looping manual standpipes because if there’s a > hydraulic advantage but the system has to be sectionally isolated, then a > dead-end calc’ should be the basis of design. I’m a proponent of the KISS > theory. (When Caputo and I were advocating and lobbying city building and > fire officials for residential fire sprinklers back in the 80’s he used to > say that the best and simplest residential sprinkler system was just pipe, > fittings and sprinklers and no extraneous valves or connections. I agree > with that approach, especially with manual standpipes.) There are > scenarios with multi-zone systems where interconnection to supply a higher > zone is one of the approved arrangements, but if I’m the AHJ, I’m down with a > single interconnection and no check valves, wet or dry. > > > > SL > > Bright eyed and bushy tailed, whatever that’s supposed to mean > > > > > > > > From: Jamie Seidl <[email protected]> > Sent: Wednesday, July 03, 2024 5:44 AM > To: [email protected] > Subject: [Sprinklerforum] FW: 2013 NFPA 14 7.5.3 > > > > Quick question on a holiday week. > > 7.5.3 states that "Where standpipes are interconnected at the top and bottom, > check valves shall be installed at the base of each standpipe to prevent > circulation”. > > Is this requirement intended to apply to manual dry standpipes? NFPA 14 does > not appear to make a distinction in this case, but if they're intended to > prevent circulation, I would imagine that is not a concern with a manual dry > system. > > Steve, are you on vacation yet? This one is up your alley. > > > > Thanks for your time. > > > > Jamie Seidl NICET SET #107472 > > Century Fire Protection http://www.centuryfp.com/ | General Manager > 3600 Woodpark Blvd. Suite G Charlotte, NC 28206 > > ___________________________________________________________________ > > p 704 888 3473 tel:7048883473 | m 704 650 0033 tel:7046500033 Facebook > https://www.facebook.com/CenturyFP LinkedIn > https://www.linkedin.com/company/century-fire-protection Twitter > https://twitter.com/centuryfp > > > > > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to [email protected] >
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