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)
