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lQr Shall he construcred with a long <br />throi►ghway without acute turns capable of <br />paisi.ng a three inch solid Sphere. <br />The iurpeller shell he dynamically bal- <br />anced. Static and dynamic bal4ncing <br />operations shall not. deform -,r weaken it. <br />} <br />The impeller shall be .9 slip fir t.'+ <br />the shaft and key driven. Non -corroding <br />fasteners shall be used. <br />A <br />The r►mp shaft shall he stainless steel ANSI 431. The pump shaft shall rotate <br />on two permanently lubricates heerings. <br />Hearirogg shall be designed' for long <br />life based on the dynamic londi,ig of <br />the pump and shall be hell bearing and/or <br />N <br />roller, bearings. <br />4� <br />F,ach pump shall he provided with an <br />oil chamber for the shaft sealing Svstem. <br />The oil chamber shall be + signed to <br />assure that air is left in the oil cham- <br />iti <br />her, to absorb the expansion of. the <br />oil due to temperature variations. The <br />drain and inspection plug, with positivr <br />anti -leak seal shall be easily acces- <br />sible from the outside. <br />1� <br />Each pump shall be provided with a tandem mechanical rotating shaft seal Sys- <br />tem running the in oil reservoir and having separate constantly hydro -dynami- <br />cally lubricated lapped seal faces. The Real unit shall have carbon and cera- <br />mic faced seals. F.ach interface shall he held in contact by i is -%-I spring <br />system supplemented by external liquid pressures. The seals shall require <br />neither maintenance nor adjustment, but shall he easily inspected and replace- <br />able. No seal damage shall result from operating the pumping unit out of its <br />liquid environment. The seal yvsrem shall nl.t rr-Iv upon the piunped media for <br />lubrication. <br />1� <br />A sliding guide bracket shall be an integral part of the oump unit. The <br />volute casing shall have a machined discharge flange to automs,,ically connect <br />r <br />with the cast iron discharge connection, which when bolted to the floor of the <br />sump and discharge line, will receive the pump discharge connecting flange <br />without the need of adjustment, fasteners, clamps or similar devices. <br />Installation of the pump unit to the discharge conne.ctio shall be the resillt <br />.,, of a simple downward motion of the pump. Sealing of pump to the discharge <br />connection shall be means of eccentric weight of pump for metal to metal sur- <br />faces or a puff -out, Runa N diaphram for gasket sealing or approved equal. <br />em <br />F.ach pump shall be furnished with guide bars of at least standard weight gal- <br />vanized steel pipe of adequate length +or the application. Intermediate <br />► stainless steel guide bar supports spaced at a maximum of 15 feet shall be <br />so furnished for stations over 20 feet deep. 11pper guide bar holders shall he an <br />integral part of or bolted to the access hatch. Lower guide bar 1-iolder4 shstl <br />t he an integral part of the discharge connection. Holders for liquid level <br />cahles, power cable and safety chain 'hall he furnished and installed for each <br />pump. All holts and anchors shall he .,f Atatnless ,steel. <br />35,1Ut1-4 <br />(►-Sable <br />Copvright 1485 <br />Ronestroo, Rosene, Anderlik <br />b Associates, inc. <br />