City of Palestine Centrifuge Control Upgrade Project March 31, 2016 NOTICE TO BIDDERS

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1 City of Palestine Centrifuge Control Upgrade Project March 31, 2016 NOTICE TO BIDDERS Sealed bids will be received by the city of Palestine, Palestine, Texas at the office of Theresa Herrera, City Secretary, 504 N Queen, Palestine, Texas until the 25 th day of April 2016 at 3:00 PM at which time bids duly delivered and submitted will be considered for the following: RFP # City of Palestine Centrifuge Control Upgrade Project Any bid received after stated closing time will be returned unopened. If bids are sent by mail to the City Secretary, the bidder shall be responsible for actual delivery of the bid to the City Secretary before the advertised date and hour for receiving of bids. If mail is delayed by the postal service or courier service beyond the date and hour set for the bid opening, bids thus delayed will not be considered and will be returned unopened. Information concerning the bid specifications may be obtained by calling Felipe Garcia, Waste Water Treatment Plant Supervisor at or fgarcia@palestine-tx.org; or Tim Perry, Public Works and Interim Utilities Director at or timperry@palestine-tx.org. Information on the bid process/procedures may be obtained from Heather Powell, Purchasing Agent at or hpowell@palestine-tx.org. Until the final award by the City of Palestine, said City reserves the right to reject any and/or all bids, to waive technicalities, to re-advertise, to proceed otherwise when the best interests of said City will be realized hereby. Bids will be submitted sealed and plainly marked with the date and time of opening. Publication Dates: Thursday, March 31, 2016 and Thursday, April 7, 2016 Closing Date: Monday, April 25, 3:00 PM Bid Opening: Monday, April 25, 5:30 PM

2 Centrifuge Control Upgrade City of Palestine Waste Water Treatment Plant- Alfa Laval PM I II General A) The back drive and control system of the existing Alfa Laval PM centrifuge at the Main WWTP are antiquated and in need of upgrading, improvement, and/or replacement. The intent of this specification is to obtain the services of a qualified Centrifuge Supplier regularly engaged in the supply and installation of centrifuge drives, control systems to upgrade the back drive system, replace the existing control panel for this unit, and bring the centrifuge back to a dependable operating state. Description A) The purpose of this project is to replace one (1) Alfa Laval PM-3800 Control Panel, Feed Pump Panel, Eddy Current Brake back drive motor and motor mount system. The successful bidder will be required to provide on-site personnel for modification, removal and installation, function testing, start-up, and operator/maintenance training. This project shall be turnkey including removal of old components, control panels, installation of new Centrifuge Control Panels (CCP s) and back drive components. The work shall be provided by a centrifuge manufacturer that is: 1) Currently supplying and installing new centrifuge machines and control systems 2) Experienced in upgrading existing centrifuge systems 3) Familiar with the sludge dewatering process B) This centrifuge shall be modified and fitted with a new back drive motor, motor mount stand and modified belt guard. The new motor shall be properly sized to provide the required speed and torque range required to meet the centrifuge operating capacity. Each new motor shall be an AC inverter duty rated motor. The existing main drive motor shall be utilized. C) The existing centrifuge control panels shall be disconnected, removed and replaced with new CCP s. The new CCP shall be a UL508A listed assembly and shall contain the following major components: 1) Main power disconnect 2) Main Drive Variable Frequency Drive (VFD) 3) Feed pump VFD 4) Back drive VFD torque control system with power regeneration 5) Programmable Logic Controller (PLC) system 6) Color touchscreen Operator Interface Terminal (OIT) 7) Required switches, power supplies, relays, fuses, and terminals D) The City will provide a Licensed Electrical Contractor of its choosing for the site work to make listed modifications and electrical work required to remove obsolete 1 P a g e

3 components, conduit, and wiring and to install new control panels, motors, conduit, and wiring as required per the developed design drawings and instructions. E) The work required for this project shall be coordinated by a Centrifuge Original Equipment Manufacturer (OEM), who will provide guidance for the on-site mechanical and electrical modifications and installation. The Centrifuge OEM shall provide the engineering design, programming, function testing, and start-up of each upgraded centrifuge control system. F) Warranty of supplied components shall be a minimum of one year from delivery at the City s site. An option for an extended warranty shall be provided as an option to the proposal pricing. III References: The design, manufacture, and installation of this equipment shall meet or exceed the applicable provisions and recommendations of the following codes and standards authorities. A) AGMA, American Gear Manufacturers Association B) ASME, American Society of Mechanical Engineers C) ASTM, American Society of Testing and Materials D) ANSI, American National Standards Institute E) IEEE, Institute of Electrical and Electronics Engineers F) NEC, National Electrical Code G) OSHA, Occupational Safety and Health Act IV Quality Assurance A) Bidder Qualifications: 1) Bidder must be a centrifuge OEM and currently engaged in the design, supply, and installation of centrifuges and centrifuge control systems. Confirm this requirement is met with proposal submittal. 2) Provide references with proposal of at least three (3) similar projects completed during the last five (5) years. Include information on the machine type, project description, customer name, and customer contact information. 3) Bidder must possess Alfa Laval/Sharples Centrifuge Factory Training Certification for centrifuges being upgraded. Include a copy of certificate with proposal. 4) Centrifuge OEM s facility must be within two hundred seventy five (300) miles of the City of Palestine, Tx facility. 5) Bidder must have more than ten (10) years of experience supplying and installing centrifuge controls and control system upgrades. B) Workmanship and Design: 1) All parts of the equipment provided are to be designed and manufactured for long, continuous, and uninterrupted service. All materials used are to be of best quality and entirely suitable for service required. 2 P a g e

4 V 2) Modifications to the existing control panels shall be made for easy adjustment or replacement of all serviceable parts. A minimum clearance is required for proper maintenance. 3) Electrical work shall be completed by a qualified Electrical Contractor following all trade codes and standards previously listed and per local code requirements. C) Sub-contractor Services 1) Electrical sub-contractor will be provided by the City, to furnish qualified, licensed electricians for the removal of obsolete components and installation and wiring of new components, and provide for disconnection of DC back drive motor and installation and wiring of new AC back drive motor including new wire pulled in existing conduit for motor power. All work is to be performed per centrifuge manufacturer s engineering documentation and instructions. The electrical sub-contractor shall supply tools, wire, wire markers, and all miscellaneous hardware for complete installation. 2) Centrifuge manufacturer shall furnish a qualified technician for the modification of the existing back drive motor mount, motor, belt guard, and installation of new components and on-site welding if required. All work to be performed per centrifuge manufacturer s engineering documentation and instructions. The centrifuge technician shall supply all tools, welding equipment and miscellaneous hardware for complete installation. Submissions A) Shop drawings, catalog cut sheets, and other materials required to completely describe and specify system and equipment shall be submitted to the City for review. These shall include: 1) Control panel layout and dimensional drawings 2) Revised electrical schematics 3) Revised Bill of Material (BOM) 4) Written control system description 5) Written sequence of operation 6) Back drive motor mount drawings B) At the completion of the project the manufacturer shall supply the following asbuilt documents and electronic files: 1) Control panel layout and schematic drawings 2) BOM 3) Control System Description 4) Sequences of Operation 5) PLC Program code, annotated 6) OIT Application Program 3 P a g e

5 VI 7) Component Operation and Maintenance Information Delivery, Storage, and Handling: Components shall be shipped to the City s site. The City will off load and store in a clean dry environment until commencement of work at which time parts delivered shall be turned over to Contractors Personnel on site. VII Warranty A) Warranty of supplied components shall be a minimum of one year from delivery at the City s site. B) An option for an extended warranty shall be provided as an option to the proposal pricing. VIII Products General A) The equipment specified herein addresses modification for one (1) Alfa Laval PM Centrifuge to be performed by a centrifuge manufacturer meeting all of the detailed requirements of these specifications, without exception. B) Like items of equipment shall be the product of one (1) manufacturer to achieve standardization of operation, spare parts, maintenance, and manufacturer s service. IX Control System Requirements A) The centrifuge control panel shall be a NEMA 4 freestanding enclosure. B) The panel shall include a flange mount main disconnect that can be locked in the off position. C) Main Drive Power Components shall consist of an Allen Bradley Powerflex 753 VFD for bowl drive motor and shall be rated at 40 HP; a Allen Bradley Powerflex 753 VFD rated for 7.5 HP for the scroll drive motor; a Allen Bradley Powerflex 753 for the feed pump. D) The panel shall operate from a 480V AC, 3 phase, 60 Hz service and shall also include a control power transformer for auxiliary components. E) Main control components shall consist of : 1) Square D 100A main circuit breaker 2) Allen Bradley programmable logic controller 3) Control relays 4) Terminal points for interconnection with ancillary equipment F) Door mounted components shall consist of : 1) Mushroom head maintained emergency stop 2) NEMA 4X Allen Bradley 10 inch color touch screen OIT 3) OIT control functions on front of control panel shall, as a minimum, include: Start/Stop, On/Off controls of: (a) System Control Power (hardwired push button) (b) Auto Sequence (c) Clean in Place (CIP) Sequence (d) Centrifuge Drives (e) Wash water Solenoid Valve (f) Alarm control 4 P a g e

6 X OIT Status Indication for: (a) System Control Power on (b) Auto Start Starting in Auto (c) Auto Stop Stopping in Auto (d) CIP Running in CIP (e) Centrifuge Running (f) Wash water Solenoid Open (g) Ready for Feed Ready Alarms shall consist of a siren and strobe light, and shall notify plant personnel of the following faults. (a) Emergency Stop Fault (b) Bowl Motor Overload Fault (c) Bowl Drive Motor Temperature Fault (d) Back Drive VFD Fault (e) Back Drive Motor Temperature Fault (f) Back Drive High Torque Fault (g) Back Drive High-High Torque Fault (h) High Vibration Fault (i) High-High Vibration Fault (j) Low Relative Speed Fault OIT Digital Speed, Flow Indication of: (a) Bowl Speed RPM (b) Back Drive Speed RPM (c) Back Drive Torque Percent (d) Differential Speed RPM (e) Vibration In/Sec (f) Feed Rate Percent OIT Speed Control for: (a) Back Drive Differential Speed (PI Manual) (b) Back Drive Pinion Speed (PI Manual) (c) Back Drive Torque (PI Auto) Back drive System Requirements A) The existing back drive Eddy current motor shall be disconnected and removed. Existing conduit stub shall be reused and unused stubs capped as required for new power feed. B) The existing motor mount, sheaves, and belt guard shall be modified to accommodate new AC motor. The motor shall be replaced and new wire properly sized and pulled through existing conduit. C) The back drive motor shall be 7.5 HP, 460VAC, 3Ph, inverter rated, severe duty, high efficiency. The motor shall be supplied by the centrifuge manufacturer and the motor manufacturer used shall have supplied motors for this type of centrifuge application. 5 P a g e

7 XI Functional Requirements A) The new centrifuge drive, control, and monitoring system shall provide the following functional capabilities: B) Back drive VFD controlled system capable of variable speed for setting differential speed of scroll conveyor. C) The centrifuge shall be capable of operating in three (3) different control modes: 1) Differential Speed Control (manual) mode shall allow operator to set the conveyor speed and maintain the set point. 2) Pinion Speed Control (manual) mode shall allow operator to set the pinion speed and maintain the set point. 3) Torque Control (auto) mode shall allow operator to set percent torque to maintain and the control system shall automatically adjust differential speed to maintain the set point. D) Operator controls, monitoring, and alarms shall incorporate existing system controls along with additional operator controls as deemed necessary for the proper operation of the complete dewatering system. In addition, automatic controls shall be provided for pausing, flushing, and resuming feed and polymer based on warning alarm indications. E) A written centrifuge control system description and sequence of operation shall be provided by the manufacturer for review and approval by the City before modification of the centrifuge system. XII Execution The centrifuge control system upgrade shall not be considered complete and satisfactory until functional testing and training on new control system is complete. A) Electrical sub-contractor shall perform all on site work per the manufacturer engineering design drawings and instructions. B) Electrical sub- contractor shall provide manpower during functional testing phase to assist with any troubleshooting of wiring and installation. XIII On Site Installation Application Manufacturer s Representation for Installation, Start-up, Testing, and Training A) The Centrifuge manufacturer s technical representative for the equipment specified here in shall be present at the jobsite for five (5) work days for the services listed below. The following services shall be provided with allocation of workdays as established by the City with the following distribution as a guide: 1) Two (2) workdays for onsite coordination with Electrical subcontractor 2) Three (3) workdays per centrifuge for functional testing, start-up, and training B) Workdays shall be eight (8) hour days, Monday through Friday. 6 P a g e

8 XIV Field Tests A) Functional testing shall be performed for each centrifuge control system installed. Prior to system start-up, system components shall be inspected for proper alignment, proper connection, and satisfactory operation. The centrifuge manufacturer s representative shall inspect installation of new components, check for minor adjustments, and provide certification that the control system components have been installed correctly and are ready for operation. 7 P a g e