What criteria have been used to determine that the "... diesel drivers seem to be operating properly"? If they're making RPM, then are the impellers turning at the same speed? Whole or partial disengagement can occur, but not usually in three pumps at three different locations.
Steve Leyton -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd - Work Sent: Wednesday, August 07, 2013 1:34 PM To: [email protected] Subject: vertical turbine pump problems 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
