Sounds like an excess pressure pump. These were used in areas with a lot of pressure fluctuations to prevent false alarms. This was before flow switches with delays. Gamewell was famous for these but Firematic made a fairly simple version of the same thing. Some towns (at least in this part of the world) required them
At 11:38 AM 6/27/2009, you wrote: >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) Todd G. Williams, PE Fire Protection Design/Consulting Stonington, Connecticut www.fpdc.com 860.535.2080 _______________________________________________ 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)
