Site work and renovation of a water / sewer project in Pendleton, Oregon. Completed plans call civil work for a water pump station.

The Contractor agrees to indemnify and save harmless the City of Pendleton, herein referred to as City, from any and all defects appearing or developing in the workmanship or materials performed or furnished under this Contract for a period of one (1) year from the date of each startup and final acceptance by the City. The City of Pendleton is requesting Proposals to increase the flow from the River Intake Pump Station to the Water Filtration Plant. Currently there are four (4) vertical turbine pumps; three (3) 250hp pumps and one (1) 125hp pump. This Proposal is to replace one (1) of the 250hp pumps with new bowls, shafting, if needed, and a new motor. This pump currently pumps high turbidity water during the spring runoff. Shafting and bushings seals needs to take this into account. o 3750 gpm @ 300' o Water temperature: 32O-85O F o Water turbidity: 1-100+ ntu 1. PUMP: a) Existing discharge head is a 12" flange fitting. The well column is 12" flanged pipe. (See attached drawing) New pump will use existing discharge and column with modifications for the motor, if needed. The overall length from the bottom of the discharge head to the bottom of the strainer is 290" max; 280" minimum. b) The suction bowl or suction bell shall be provided with non-soluble grease packed bronze bearing. Bowl bearings will be constructed of steel back rubber. A bronze sand collar shall be provided to protect this bearing from abrasives in the pumping fluids. The bearing housing shall have sufficient opening at the bottom for easy removal of the bearing. A galvanized strainer will be provided. It shall have a net inlet area equal to at least three times the impeller inlet area. The maximum opening shall not be more than 75 percent of the maximum opening of the water passage through the bowl or impeller. c) The line shaft shall be 416SS steel ground and polished. They shall be furnished in interchangeable sections not over 10 feet in length and shall be coupled with 304 stainless steel threaded couplings designed with a safety factor of one and a half times the shaft safety factor. Shafting through the stuffing box will be ceramic to reduce wear due to the high turbidity water d) Pump 300 gpm at 300' of head. The impellers shall be constructed from ASTM B584 Silicon Bronze and shall be the enclosed type. They shall be free from defects and must be accurately cast, machined, and filed for optimum performance and minimum vibration. Impellers shall be statically and dynamically balanced at the factory to grade G6.3 of ISO 1940 as minimum. They shall be securely fastened to the bowl shaft with taper locks 416 or 316 SS (or key and split thrust ring of SS). They shall be adjustable vertically by means of a nut in the driver. e) Motor shall be a heavy-duty Premium Efficient, Inverter Duty, 1800 RPM vertical hollow shaft motor, with a non-reverse ratchet to prevent reverse rotation of the rotating elements. The brake horsepower required by the pump curve shall not exceed the rated nameplate horsepower of the motor. A thrust bearing of ample capacity to carry the weight of all rotating parts plus the maximum hydraulic thrust load under all conditions of operation calculated L10 life shall be no less than 8800 hours. Provision shall be made for momentary up thrust equal to 30 percent of the rated down thrust, 1.15 service factor, and suitable for use on 480-Volt, 3-phase, 60-Hertz electric service. A solid coupling shall be provided at the discharge head for setting the impeller to bowl running clearance Estimated cost for materials and labor is $15,000 - $25,000. For additional project information, contactTim Smith, Project Manager, tim.smitli@ci.pendleton.or.us or 541379-1195. *The value for this project is based on a financial range. The value is listed as the highest possible cost from the range provided by a stakeholder or official project document.