Around here, there's the problem of the water in the pipe freezing and breaking if the false trip occurs in the winter (and of course it would).
Either you remove and thaw the pipe, let it sit till spring, or toss the welding leads to it. glc -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ron Greenman Sent: Wednesday, October 24, 2007 9:03 PM To: [email protected] Subject: Re: Supervisory Alarm - Low Air I've always considered the high air supervision more critical than low since a malfunctioning compressor that runs the air up will cause a longer trip time whereas low air will just let you know that an unwanted trip could happen if not attended to. Of course the emphasis is put on the low air because that trip rolls fire trucks, requires a technician to be summoned, disrupts the normal course of a day and costs the owner money. All recordable events and therefore statistically useful for proving one point or another. If, on the other hand, you receive a high air you just fix the problem as a piece of equipment that needs maintenance. If a life or building was ever lost because of high air delaying a trip how would anyone ever know? The evidence would demonstrate an overwhelmed system but although it might suggest it there is nothing I can think of that would definitively demonstrate it was due to a delayed trip time. If a bear ....s in the woods...? On 10/24/07, Tim Frankenberg <[EMAIL PROTECTED]> wrote: > Dave, > > The requirement to monitor low and high air pressure has been in the code before the 1993 edition of the National Fire Alarm Code. > > Most of the supervisory pressure switches installed are very much capable of monitoring both low and high air and have been able to for many, many years. More times than not, the high air condition is not being enforced by the AHJ. > > Kind Regards, > > Tim Frankenberg, CFPS > > Tim Frankenberg, CFPS > Fire Product Manager > Potter Electric Signal Company > www.pottersignal.com > 800-325-3936 > > >>> "Dave Phelan" <[EMAIL PROTECTED]> 10/23/2007 4:52 PM >>> > Something new to me popped up today as we are now using the 2002 editions of > 13 & 72 here. > > On a dry pipe sprinkler the National Fire Alarm Code - NFPA 72 states that > the air supervisory sensor shall signal on loss of 10 PSI but also on 10 PSI > greater than the system set pressure. Check out 5.13 for yourself but I'm > thinking Ive never seen or tested for air greater than 10 PSI of the set > pressure before. > > How is this being handled in the field during installs and maintenance ? > Does the typical air pressure switch in the little red cover actually cover > both loss and increase pressures? > > Thanks. > > Dave - a NJ AHJ > > _______________________________________________ > 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) _______________________________________________ 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)
