Renovation of a water / sewer project in Prescott, Arizona. Completed plans call for the renovation of a water / sewer project.

All communications (other than delivery of the proposal as defined below) shall be addressed to the City project representative at the following: Jaimie Sventek Contracts Coordinator contracts@prescott-az.gov Requests for information must be received by the project representative prior to 5:00p.m. on Tuesday, June 3, 2025. DESCRIPTION: The City of Prescott is formally soliciting bids from qualified and experienced suppliers to provide one mechanical bar screen and wash press. The successful supplier must demonstrate they have sufficient capabilities and available resources to meet the product specifications and other requirements of this solicitation. The City of Prescott reserves the right to accept or reject any or all bids, and/or some or all of the alternates bid, and waive any informality deemed in the best interest of the City and to reject the bids of any persons who have been delinquent or unfaithful in any contract with the City The City of Prescott is formally soliciting bids from qualified and experienced suppliers to provide one mechanical bar screen and wash press. The successful supplier must demonstrate they have sufficient capabilities and available resources to meet the product specifications and other requirements of this solicitation. A. DESCRIPTION OF WORK The City is seeking a wastewater equipment supplier to provide one mechanical bar screen, and one wash press to replace an existing bar screen at the Sundog Wastewater Treatment Plant per the attached specifications. Installation to be performed by others. B. SCOPE OFWORK ANDSPECIFICATIONS Supplier shall furnish one (1) mechanically cleaned bar screen with rake(s) and one (1) screening wash press for washing, dewatering, compacting, and conveying screenings into a materials bin for disposal. The screen and press shall be manufactured from a minimum grade of 304 stainless steel, 316 stainless preferred. Fabrication and assembly shall be in conformance with these specifications. Screenings Wash Press shall be compatible with the bar screen, preferably as one unit. Supplier shall coordinate a site visit to inspect the existing bar screen and channel and record measurements to confirm proper fitment of the new bar screen. Quality Assurance 1. Manufacturer shall have a minimum of twenty (20) years' experience producing equipment substantially like that required and shall be able to submit documentation of at least fifteen (15) independent installations using the same size or larger equipment as detailed below. Each installation must have been in satisfactory operation for at least five (5) years. a. The Contract Documents represent the minimum acceptable standards for the screening equipment for this project. All equipment shall conform fully in every respect to the requirements of the respective parts and sections of the specifications. The entire unit shall be Manufacturer's standard product, but shall be modified, redesigned, furnished with special features or accessories, made of materials or provided with finishes as may be necessary to conform to the quality mandated by the technical and performance requirements of the specification. b. The entire unit shall be manufactured from AISI 316 or AISI 304 stainless steel. No stainless-steel components may be fabricated or assembled in a factory where carbon steel products are also fabricated, to prevent contamination by rust. c. All stainless-steel parts of the unit shall be fully submerged into a pickling bath for at least 8 hours to remove welding spots and to protect the stainless steel against corrosion. Glass bead blast or chemically treated stainless steel shall not be allowed. d. Electric motors, gear reducers, and other self-contained or enclosed components shall have an acrylic enamel finish e. Manufacturer shall provide evidence of Original Equipment Manufacturer (OEM) of the specified screen design and manufacturing. Unlicensed screen designs shall not be accepted. f. Fabrication shall be done in compliance with all applicable ASTM standards or equivalent international standards. g. All welding in the factory shall use shielded arc, inert gas, MIG or TIG method. Filler wire shall be added to all welds to provide for a cross section equal to or greater than the parent metal. Butt welds shall fully penetrate to the interior surface and gas shielding to interior and exterior of the joint shall be provided. h. Bolts, nuts and washers shall be selected from AISI 304 or 316 stainless steel such that they are anti-seizing. i. j. Manufacturer shall have established an ISO 9001 certified quality management system. Equipment suppliers not utilizing ISO 9001 facilities shall not be considered or approved for this project. Equipment supplier shall provide evidence of certification before being named as an acceptable manufacturer. Manufacturer shall have established an ISO 14001 certified environmental protection management system designed to monitor and help minimize the harmful effects on the environment caused by its manufacturing processes. Equipment suppliers not utilizing ISO 14001 facilities shall not be considered or approved for this project. Equipment supplier shall provide evidence of certification before being named as an acceptable manufacturer. k. All welding is performed in accordance with American Welding Society (AWS) D1.1 Structural Welding Code, or equivalent. l. Manufacturer shall provide screen, motors, gear reducers, controls, control panels, and lifting attachments as a complete integrated package to ensure proper coordination, compatibility, and operation of the system. The manufacturer shall test-run the fully assembled machine in the factory before shipment. 2. Manufacturer shall provide services by a factory-trained representative, specifically trained in the specified type of equipment. The representative requirements include, but are not limited to the following: a. The representative shall be present during initial energizing of equipment to determine directional testing as described in Section 4.01 C (Installation). b. The representative shall inspect and verify location of anchor bolts, placement, leveling, alignment and field erection of equipment, as well as control panel operation and electrical connections. c. The representative shall provide classroom and/or field training on the Operation and Maintenance of the equipment to operator personnel. These 4 instructions may include the use of slides, videos, literature, and/or oral presentations. d. Manufacturer shall state field service rates for Representative to Owner. If the field service time required by this section should not be sufficient to properly place the equipment in operation, and the requirement for additional time is beyond the manufacturer's responsibility. Chain and Rake Unit 1. The Chain & Rake System shall be a self-contained, screening system used to capture and transport wastewater debris to the discharge. The controller shall provide independent control of the Chain & Rake System. An interface shall be provided for the ultrasonic transducers. 2. The Chain & Rake screen consists of vertically oriented rectangular or tapered bars, spaced to create a fabricated and stiffened grid which is carried on supports spanning the channel width. 3. The bar rack extends from the invert of the channel to 6" above the maximum water level unless noted, where it shall be connected to a debris plate on which the screenings shall be lifted to the discharge apex prior to them dropping across the apron plate into a receptacle or screenings handling system. 4. The screenings are mechanically cleaned from the bar rack by rakes with tine plates mounted on carriers attached to the links of the roller chains on each side of the screen. The complete screen is constructed such that it forms a strong and rigid integral structure which is secured to the support beams which span the width of the channel. 5. The chains run over stainless steel drive sprockets keyed to the main drive shaft which is mounted in bearings and is driven by a shaft mounted motorized gear unit. Wash Press 1. Compactor housing shall be fabricated with 316 stainless-steel. 2. Compactor shall have a stainless-steel auger. 3. Unit shall operate independently and have its own drive unit. 4. Drive motor shall be 460 Volts, 3 ph, 60 Hz. Components 1. Chain, Sprockets and Drive Shaft Assemblies a. The chains shall be roller type with stainless steel side plates. The rollers, pins and bushings shall be hardened stainless steel. Chain material and strength shall be as specified in the Design Data section, items 12, 13, 14. b. The stainless-steel drive shaft shall be supported on each side by grease lubricated take-up bearing assemblies. 5 c. The chain shall track in a stainless-steel guide system mounted in each side frame. The guide system shall incorporate UHMW wear strips. 2. Side Frames a. The screen shall include side frames and bracing designed to support the chain, rakes, spray wash, discharge, and drive assemblies. The side frames shall be manufactured from material and thickness as specified in the Design Data section, items 7, 8. b. Each side frame shall be designed to house the replaceable stainless steel and UHMW polyethylene tracking system. c. The bottom tracking system shall consist of a stainless-steel inner and outer ring. 3. Covers a. The portion of the screen above the operating floor level shall have stainless steel covers. b. The covers shall provide quick access to the equipment for maintenance. Material of construction shall be as specified in the Design Data section, item 8. 4. Drive Assembly a. The screen drive assembly shall be a shaft-mounted reducer with an electric motor. The reducer type, ratio, motor rating, and characteristics shall be as specified in the Design Data section, items 16, 17, 18, 19, 20, 21, 22. b. The rake speed shall be as specified in the Design Data section, item 11. 5. Wiper a. The wiper shall be stainless steel, pivoting and easily adjustable. b. The wiper shall have a replaceable UHMW polyethylene blade. 6. Bar Rack a. Bars shall be stainless steel and shaped as specified in the Design Data section, items 3, 4. The bar rack shall extend 6" above the max water level unless noted. b. The bar spacing shall be as specified in the Design Data section, item 5. The bars shall be supported as required. c. Each bar of the bar rack shall be removable from the bar rack assembly. Bars shall not be welded in place. 6 7. Rakes a. The stainless-steel rakes shall be constructed of two or more pieces and are bolted to the stainless-steel chain on each side. b. The stainless-steel rake frame is designed to fasten to, support, and align the rake teeth. c. The stainless-steel rake teeth shall be machined in sections and designed to fasten to the rake frame. 8. Apron and Dead Plate a. The apron and dead plate shall be stainless steel. 9. Discharge Chute a. The discharge chute shall receive screened debris that has been removed from the rakes by the wiper. b. An enclosed stainless steel discharge chute shall transport the discharge to a sluiceway, compactor or container. c. The height of the discharge chute from the operating floor level shall be as specified in the Design Data section, item 10. Controls 1. Components a. PLC shall be an Allen Bradley model MicroLogix 1400 b. OIT shall be an QSI model QTERM-A7 or approved equal c. Circuit Breaker shall be Siemens or approved equal d. Starters shall be Allen Bradley IEC or approved equal e. Relays shall be Allen Bradley and/or IDEC or approved equal f. Pilot lights shall be Allen Bradley 22mm Type 4/4X/13 or approved equal g. Selector switches shall be Allen Bradley Type 4/4X/13 or approved equal h. Ultrasonic differential level system shall be Endress & Hauser Control Panel 1. The control panel shall be UL/cUL listed and wired as specified in the Design Data section, items 20, 21, 22. 2. The main control panel shall be mounted remotely to the screen and contain the following switches and lights: a. Reset push button 7 b. Power on light c. Screen run light d. Alarm light (overload) 3. The local control station shall be mounted locally to the screen and contain the following: a. Hand/Off/ Auto selector switch for the screen b. Forward /Off/Reverse selector switch, spring returned in reverse c. Emergency Stop push button 4. Ratings for the main control panel and local control station enclosures shall be as specified in the Design Data section, items 23, 24. Operation 1. When the screen is in the Hand mode and in the Forward position the screen shall run continuously. The Reverse position is spring loaded and shall only operate in the Hand mode. 2. In the Auto Mode the screen cycle shall start with a signal from one of the following: a. Differential level system b. Timer (backup) c. Input error from transducer (loss of echo) d. High level alarm e. High level start 3. If the screen starts by means of differential-level, the screen shall run until the differential drops below the set point and the off-timer times out. 4. If the screen starts on high level it shall run until the high-level drops below the set point and the off-timer times out. 5. If one of level transducers has an error the screen shall run continuously. 6. The screen also has a backup timer that shall allow the screen to operate periodically during periods of low activity. The timer is adjustable for both start frequency and duration of run. Source Quality Control Each Chain & Rake System and controller shall be factory tested to ensure satisfactory operation. 8 Warranty The equipment shall be covered by a warranty certificate and be free from defects in materials and workmanship for a period of 12 months from start-up, not to exceed 18 months from date of shipment. Installation Chain & Rake System(s), Wash Press and motor controller(s) shall be installed in accordance with the supplier's installation instructions, and in compliance with all OSHA, local, state, and federal codes and regulations. Field Quality Control Supplier shall provide the services of a factory-trained representative to check the installation and to start up each Chain & Rake System, Wash Press and controller. The factory representative shall have complete knowledge of proper installation, operation, and maintenance of equipment supplied. Representative shall inspect the final installation and supervise a start-up test of the equipment