Back in the olden days when I used to work for a living I would never use only a steel pipe for a compressor hook-up. Somewhere there would always be a copper loop to compensate for vibration. Now this takes about three feet of soft copper pipe to accomplish in half inch and is relatively time consuming to install so bigger bucks. Given the price of copper, and working with a different set of tools and fittings rubber hose becomes a viable candidate. Maybe the committee should look at hose as an option and set some criteria for burst strength and perhaps a nipple of X length between the compressor head and the hose itself.
On Feb 11, 2008 9:25 AM, Thom McMahon <[EMAIL PROTECTED]> wrote: > Vibration isolation is a topic that never seems to be addressed in 13, when > discussing air compressors and air supplies, yet it is a very real world > concern. I can't tell you how many times I've gone out to look at a tripped > system and the nipple connecting the DPV and air supply was cracked. Or the > 1/2" union was snapped off, or the tank connection to the air supply. > Why? Vibration! > If we were installing an air compressor for an HVAC control system, there > would be isolation on the pads mounting the compressor to the floor or wall, > and on the pipe leaving the compressor. MPE's have know for decades that Air > Compressors Vibrate! That Vibration shakes the compressors and any attached > piping. Hard pipe by it's nature will become brittle, with extended periods > of vibration, hence the cracks breaks and leaks. > We protect for seismic, which is differential movement, well so is > vibration. > > Thom McMahon > Firetech, Inc. > 2560 Copper Ridge Dr > Steamboat Springs, CO 80488-2136 > Tel: 970-879-7952 > Fax: 970-879-7926 > ----- Original Message ----- > From: "Roland Huggins" <[EMAIL PROTECTED]> > To: <sprinklerforum@firesprinkler.org> > Sent: Monday, February 11, 2008 9:54 AM > Subject: Re: rubber hose for air compressor > > > > > 13:7.2.6.3.1 says the connection PIPE shall be at least 1/2 inch. How > > would you as the AHJ interpret the term "pipe" when it is exposed to the > > pressure of the system when it trips thus a source for water loss? IF > > (and a big if at that) one argued that listed material is not required as > > part of the pressure boundary (some components aren't) then how does that > > same person avoid the APPROVED requirement that those non-listed items > > require. Saying the air compressor is neither listed or approved isn't > > an adequate basis since it is outside the pressure boundary and does not > > effect the ability of the system to perform. Avoiding tripping the > > system is addressed by NFPA 25 (which had some additional tightening-up > > last cycle). > > > > What say the AHJ sector of the Forum? > > > > Roland > > > > On Feb 11, 2008, at 8:09 AM, R Richardson wrote: > > > >> We recently ran into something we have not seen and are curious as to > >> others experience. > >> > >> Typically the connection between the air compressor and a dry pipe > >> system is rigid pipe, but lately we have been seeing rubber hose used. > >> The rubber hose does not appear to meet the standard. > >> > >> How does the group feel about the use of rubber hose for this > >> aplication? > >> > >> Thanks > >> > >> Rich Richardson > >> Seattle Fire Department > >> > >> _______________________________________________ > >> Sprinklerforum mailing list > >> Sprinklerforum@firesprinkler.org > >> http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > >> > >> To Unsubscribe, send an email to:Sprinklerforum- > >> [EMAIL PROTECTED] > >> (Put the word unsubscribe in the subject field) > >> > >> _______________________________________________ > >> Sprinklerforum mailing list > >> Sprinklerforum@firesprinkler.org > >> http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > >> > >> To Unsubscribe, send an email to:Sprinklerforum- > >> [EMAIL PROTECTED] > >> (Put the word unsubscribe in the subject field) > >> > > > > _______________________________________________ > > Sprinklerforum mailing list > > Sprinklerforum@firesprinkler.org > > 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 > Sprinklerforum@firesprinkler.org > 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 Sprinklerforum@firesprinkler.org http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
