SERIES 520 SINGLE STAGE SUMP PUMPS 1.0 GENERAL The contractor shall furnish (and install as shown on the plans) Aurora Model 522 Duplex centrifugal sump pump size 1.5x2x6 of ?(bronze fitted) (all iron) construction. Each pump shall have a capacity of US gpm at ft total head, with a temperature of 60 °F, 1 specific gravity. The units shall be designed for a sump depth of ? ft and shall be furnished with the discharge terminating at the baseplate with a male threaded connection. 2.0 BASEPLATE A steel baseplate ?(round) (square) (simplex) (simplex with manhole) (duplex with manhole) will be provided. 2.1 CASING The pump casing and suction cover shall be cast of iron. The casing is to be of single stage design and cast integrally with the bearing cover. 2.2 STRAINER A strainer of sufficient size (optional on 2" pumps) shall be provided. 2.3 IMPELLER The impeller is of the semi-open type and shall be constructed of bronze. The impeller is to be dynamically balanced and keyed to the pump shaft. 2.4 COLUMN PIPE The column pipe must be 1 1/2" diameter having machined tongue and groove joints to insure shaft alignment. 2.5 BEARINGS A pump bearing will be located directly above the impeller and shall be of the bronze sleeve type. Line bearings must be provided on pit depths of 5'-2" and one additional bearing for each 4' thereafter. Line bearings must be ?(grease) (oil) (water) lubricated through separate Nylon tube lubrication lines terminating at the baseplate. 2.6 MOTOR PEDESTAL The motor pedestal is to be of cast iron, one piece construction, fitted with a sealed thrust ball bearing located 3" above the baseplate. 2.7 STUFFING BOX An optional packed stuffing box complete with a split gland shall be provided for gas-tight construction. 2.8 BEARING COLLAR/GREASE SEAL The ball bearing collar is to allow external axial adjustment of the shaft and impeller. A grease seal shall be provided to retain grease and to prevent contamination of the ball bearing. A grease fitting will be provided to allow regreasing of the bearing. 2.9 FLOAT The pump shall be controlled by an enclosed ?(heavy duty) (water tight and explosion resisting) (heavy duty with built in overload protection) (explosion proof) type float operated switch 6" above the baseplate with reinforced plastic float and float rod. A flexible bellow will provide gas-tight construction. 3. MOTOR An automatic alternator shall be furnished on duplex pumps to allow the pumps to alternate on each successive cycle of operation. The pumps are to be driven by and flexible coupled to a standard "C" flange ? H.P., ? volt 60 cycle, 1800 R.P.M., ? enclosure, vertical electric motor. PART III - PERFORMANCE 3.01 CONDITIONS OF SERVICE The following conditions of service shall be strictly adhered to: Number of Units.................... ? Type of Drive...................... ? (variable or constant) Discharge Size, minimum............ 1.5 in Suction Size, minimum.............. 2 in Sphere Size, minimum............... ? in Design Capacity.................... US gpm Design Head........................ ft Efficiency at Design, minimum...... % Rotative Speed, maximum............ 1750 RPM Shut-off Head, minimum............. 45.5 ft Driver Horsepower, minimum......... 0 hp NPSHR at Design, maximum........... ft Secondary Capacity................. ? US gpm (at maximum RPM) Secondary H 3.02 INSPECTION AND FACTORY TESTS A. The Engineer shall have the right to inspect or witness test any material or equipment to be furnished, under this section, prior to their shipment from point of manufacture. The Engineer shall be notified at least ten (10) working days in advance of any testing in order to exercise or waive the right to witness any testing. B. Each centrifugal wastewater pump furnished under these specifications shall be tested at the factory in accordance with the latest edition of the Hydraulic Institute Standards for both hydrostatic pressure and performance. Certified copies of all test reports shall be submitted to the Engineer for approval prior to shipment. C. Each pump shall be tested at the full load speed of the respective driver for head, capacity, brake horsepower and efficiency from shut- off to 150% of design capacity. In addition, for variable speed units, one (1) pump of each service shall be tested at the minimum design conditions plus three (3) equally spaced speeds between the minimum and maximum conditions. D. Tests on all motors shall be conducted in accordance with IEEE Standards. All test results shall be submitted to the Engineer for approval prior to shipment. 1. Each motor shall be given a short commercial test which includes the following: a. No load running current b. High potential c. Winding resistance 3.03 INSTALLATION AND ACCEPTANCE TESTS A. The pumping units shall be installed in accordance with the instructions of the manufacturer and as shown on the drawings by the Contractor. B. Installation shall include furnishing the required oil and grease for initial operation. The grades of oil and grease shall be in accordance with the manufacturer's recommendations. C. Furnish the services of an authorized factory representative to inspect the final installation, perform initial start-up and supervise the field acceptance tests of the equipment. D. Field acceptance testing shall be conducted after the installation of all equipment has been completed and the equipment operated for an initial period to make all necessary adjustments and corrections. Each pumping unit shall be tested to determine satisfactory operation and compliance with these specifications in the presence of the Engineer or his representative. Testing shall be conducted for a sufficient time to demonstrate compliance and satisfactory operation. All expenses for conducting the field acceptance tests shall be borne by the Contractor. NOTES: Teflon is a registered trademark of E.I. DuPont. Additional information is available from any Aurora Pump authorized distributor. Aurora Pump reserves the right to make revisions to its products and their specifications without notice.