And it sounds like a homemade one. On Sat, Jun 27, 2009 at 9:00 AM, <[email protected]> wrote: > You are probably looking at an excess pressure pump used to keep system > pressure high to avoid false alarms due to pressure surges. > Mike Wisneski > Sent from my BlackBerry® smartphone with Nextel Direct Connect > > -----Original Message----- > From: [email protected] > > Date: Sat, 27 Jun 2009 11:38:16 > To: <[email protected]> > Subject: mercoid switch on wet riser > > > I saw something which I do not understand and hope someone can explain > this to me. > A 35 year old wet system, manifold with 2 alarm valves. There is a > electric flow switch on each riser, I think added recently. > The valves were trimmed with the normal motor gongs, etc. > The system side gauges are piped together between the two risers, with > check valves, a mercoid switch labeled pump switch, and another mecoid > switch labeled alarm switch. On this piping there are 3 check valves > and a small test cock, presumably for testing. > There is a small pump with 1/2 in inlet from supply side of valve 2, > which discharges into the pressure gauge piping described above. > > What is the purpose of this? Was it standard at one time? > > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) >
-- Ron Greenman Instructor Fire Protection Engineering Bates Technical College Tacoma, WA Member: SFPE, ASCET, NFPA, AFSA, NFSA AFAA _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
