Document VG7rjj7ObVqrRBBaMoyX5pxrw

Kdward I loward CjC '( ).' ............ 11 . < im .11 i- I'.1 ./1 \. -...i ( Hi i . ; i . i- "Mil. I \\ I, i,, PRO Members 11, .in Dan Stanowick'^ Mihjcd Publicity (I.He May 25, 1990 (,)()i,.sl(r Roy Gottesman Nora Jacobs Stan Ulchaker In one of my recent publicity reports, I referenced the fact that Public Works was planning to publish one of the PVC case histories in our information package. Here's a copy of the article, from the May issue. RECEiVl. fwMY v y CTL029304 Batavia Breaks Ground with PVC Pressure Pipe BATAVIA, New York has come a long way since its first municipal sewers were installed in 1903. They were, of course, clay tiled. Unfortu nately, the material suffered break age and leaky joints after installation. Dennis Larson, Batavia's director of public works and city engineer, explained, "This city is built on a fiat bog with an unusually high water ta ble. That, plus the fact that we have numerous hot soil areas (corrosive or aggressive soils), contributed to re duced life spans for some of our force mains. In addition, maintenance costs escalated due to leakage problems on the gravity clay tile lines." More recently, Batavia included polyvinyl chloride (PVC) pipe in its tendering specifications. PVC is unaf fected by corrosion and it is smooth- walled. As such, it offers less resist ance to waste buildup, which can dramatically reduce flow capacities. In and around Batavia there are miles of PVC gravity sewer pipes ranging in size from 6 in. to the large 24- and 30-in. diameter mains. Batavia turned to PVC to provide large diameter pressure pipe for a new 4,900-ft sewer force main capable of moving all effluent in the city from a new central pumping station to an also-new treatment plant. Because Batavia has no way to bypass the line, a breakdown would mean a complete system shutdown. Consequently, per formance was a crucial consideration. For the new line, Scepter Manufac turing Company Limited, Scar borough, Ontario, Canada, a Uni-Bell member company, recommended its INSTALLING the large diameter PVC pressure pipe for the 4,900-ft force mein. 30-in. SDR 25. The pipe meets all in dustry standards and with 32-in. OD, days without leaks. The system is de numerous tight working areas. The is the largest diameter PVC pressure water transmission pipe made in North America. Pressure rated at 165 psi, SDR 25 weighs 86.58 lb/ft, has a wall thickness of 1.280 in., a design signed for an average flow rate of 6 mgd and has a peak design capacity of 22 mgd. The lower coefficient of friction in the pipe means reduced calcification PVC gasket system handled at least 20 directional changes, some as much as 90*, both vertical and horizontal. The pipe was installed under railroad tracks and bridges, and even under flow rate of 10,608 gpm, and a friction and less buildup. In hot spots, such as the Tonawanda Creek, without one loss rating of 0.200 ft per 100 fL corrosive or aggressive soils with both leak. Installation Specifics Installation of the new Batavia force main began in mid-May 1988 and was completed on schedule that September. Now tested and ready for use, the force main awaits completion of the treatment plant sometime in internal and external corrosion, PVC performs well. Batavia's high water table was also a potential problem. Average depth below the surface grade is 8 ft; the force main was installed at 10-ft depths. However, since the PVC pipe is pressure-rated (including the gas The saving in material and installa tion costs was estimated to be 20 to 25 percent. Installers reported that the PVC pipe was easy to work with, even the large diameter pipe. Lengths came together nicely, cutting was fast, and the lightweight pipe re quired lighter equipment and less 1990. The current 14-in. ductile iron main together with the present treat ment plant will be phased out of serv ice. Although normal use pressures in kets!, it can withstand higher internal and external pressures, even when it sits continuously below the water ta ble. Pipe installation averaged 150 ft per labor. Larson adds, "There wasn't one de- livery problem or delay. We evaluated the pipe carefully to start out with, and now that the job is com the line will be 30 to 40 psi, it was 8-hour day, double the estimated pleted, we are confident we made the tested ;it 100 psi for four successive projection despite the many cuts and right choice." PUBLIC WORKS for Mot/. 1990 CTL029305