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flange is (see Drawings) inch nominal size. The design shall allow for the head <br />shaft to couple above the stuffing box. <br />b. The standard stuffing box shall be cast iron or fabricated steel and rated for 100 <br />psi discharge pressure and shall contain a minimum of five acrylic graphite <br />packing rings and shall have a grease chamber. The packing gland shall be <br />bronze secured in place with stainless steel studs and adjusting nuts. The stuffing <br />box bearing shall be SAE660 bronze. A rubber slinger shall be installed on the <br />top shaft above the packing gland. The top shaft shall be 316SS and shall extend <br />through the stuffing box. <br />c. The head shaft shall be C -1045 carbon steel. Impeller adjustment shall be <br />provided at the top of the head shaft by means of an adjusting nut which shall be <br />locked in place. <br />2. Column Pipe <br />a. Shall be ASTM A53 grade B steel pipe, sized such that the friction loss will not <br />exceed 5 feet per 100 feet based on the rated capacity of the pump. The column <br />pipe shall be furnished in interchangeable sections not more ten feet in length and <br />shall be flanged. The ends of each section of column pipe shall allow for proper <br />alignment and securing of bearing retainers when assembled. Top and bottom <br />sections shall not exceed five feet. <br />3. Line shafts <br />a. Shall be 416SS. They shall be furnished in interchangeable sections not over 10 <br />feet in length. The shaft shall be sized in accordance with the maximum <br />recommended horsepower for a given size of shaft, taking into account the effect <br />of the hydraulic thrust on the pumping equipment and the weight of the shaft and <br />suspended rotating parts. To ensure accurate alignment of the shafts, they shall <br />be straight within 0.005 inches total indicator reading for a 10 foot section. The <br />butting faces shall be machined with center relief and square to the axis of the <br />shaft. The line shaft shall be provided with 316 stainless steel sleeves at the <br />Iocation of each bearing retainer. The line shaft shall be coupled with 316 <br />stainless steel couplings and shall be held in place by epoxy coated steel bearing <br />retainers with bronze bearings at each threaded joint. <br />B. Bowl Assembly <br />1. Pump Bowls <br />a. Shall be of cast iron and shall be free of blow holes, sand holes or other <br />detrimental faults and shall be accurately machined and fitted to close tolerances. <br />The bowls shall be provided with bronze bearings. The intermediate bowls shall <br />be fitted with replaceable wear rings of bronze. <br />2. Impellers <br />a. Shall be of bronze and shall be enclosed type accurately machined, balanced and <br />filed for optimum performance. They shall be securely fastened to the shaft with <br />a taper split collet, of 316 stainless steel. <br />3. Suction Case <br />a. Shall be fitted with replaceable wear ring of bronze, grease packed bronze <br />bearing and protected by a bronze sand collar. <br />4. Bowl Shaft <br />a. Shall be 416 stainless steel <br />221123 -2 <br />