The RPM was measured on the pump shaft and is consistent with the original criteria. It could be the wear rings, I'm not sure. I'm assuming you would have to pull the pump to look at. At least 2 of the pumps are ITT-AC; I believe they all are but need to confirm one.
Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com On Aug 7, 2013, at 4:34 PM, Todd - Work <[email protected]> wrote: > I am working with a school system that has 3 diesel driven vertical turbine > fire pump at various schools, each taking suction from concrete cisterns. The > pumps range in age from 5 to 15 years old. The performance on each of then > has been declining for the past several years. Example, churn decrease from > 74 psi to 68 psi. Similar declines in flows at 100% and 150%. The gauges on > the last test were my calibrateds. An investigation showed the suction > screens are clean, so that isn't the issue. All 3 diesel drivers seem to be > operating properly. Any thoughts on what to look for next? > > Todd G Williams, PE > Fire Protection Design/Consulting > Stonington, CT > www.fpdc.com > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
