02-11-1985 Council Packet - Laserfiche WebLink

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An Aluminum access hatch of the size shown on the plans shall be cast into the top slab of the pump chamber for removal of the pumps, The aluminum access A hatch shall be equal in construction to that manufart.ured by Biico Company. Door leaves shall he 1!4 inch aluminum diamond pattern to lA thstand a live load of 300 pounds per square foot. Channel frame shall he 1/4 iarh welded aluminum with anchor flange around the perimeter. Door leaves shall be OR equipped with heavy forged brass hinges, stainless steel pine, totally en- 1' closed spring operators or torsion bars as necessary for easy_ operation and an automatic hold open arm with release handle. A snap lock with removable hand- le shall he provided and an aluminum padlock hasp shall be welded to each leaf and the frame. Hardware shall be cadmium slated and all aluminum surfaces shall he mill finished with hituminous coating applied to the exterior of the frame. Access hatches using plain steel hinges will not be accepted. An aluminum ladder with intermediate supports and a welded schedule 40 steel vent shall be provided as shown on the plans. p 35,100.4. PUMP DF,SICN: The pumps shall he capable of handling raw, un- screened sewage. The design shall be such that the pump unit will be automat-ically and firmly connected to the discharge piping when lowered into place on its mating discharge connection, permanently installed in the wet well. The pump shall be easily removable for inspection or service, requiring no bolts, nuts or other fastenings to be disconnected. For this purpose, there shall be no need for personnel to enter the wet well. Each unit shall be fitted with a galvanized chain of adequate strength and 1pngth to permit raising and lower- ing the pump for inspection or removal. T s pump, with its appurtenances and cable, shall be capable of continuous suhn rgence under water without loss of watertight integrity to a depth of 65 feet. 35,100.5. PUMP CONSTRUCTION: All major parts, such as the stator casing, oil casing, sliding bracket, volute and impeller shall be of Class 30 gray iron. All surfaces coming into contact with sewage shall be protected by an epoxy coating resistant to sewage. All exposed bolts and nuts shall he of 304 stainless steel. All mating surfaces of major parts shall be machined and fitted with natrile o-rings or equal where watertight sealing is required. Machining and fitting A shall be such that sealing is accomplished by automatic compression in 2 planes and o-ring contact made on four surfaces, without the requirement of specific torque limits to affect this. Tolerances of all parrs shall he such that allows replacement of any part withmit additional machining required to ►'� insure sealing an described above. No sek-nndary sealing compounds, greases or other devices shall be used. 4. 11 A wearing ring system shall be installed to provide efficient sealing between the volute and impeller. The impeller shall he gray cast iron of non -clogging design coated with PVc epoxy, capable of handlinv solids, fibrotipt material. heavy sludge and other matter fn,rnd in normal sewage applications. -Le impel- 0- $841 c C,opvright 1965 Ponestroo, Rosene, An4erl: 6 Associates, Inc.