Norwood High Service Pump Replacement

Transcription

1 T E C H N I C A L M E M O R A N D U M NORWOOD HIGH SERVICE PUMP REPLACEMENT Norwood High Service Pump Replacement PREPARED FOR: JEA Planning PREPARED BY: Joshua M. Brown DATE: February 2017 (Rev. by Mike Hersey ) Introduction & Background The purpose of this technical memorandum is to define the scope, schedule, and estimated capital cost for the replacement of the high service pumps at the Norwood water treatment plant (WTP). In addition, the enclosed information is provided for JEA s use in procuring a consultant to complete the management, engineering, and any necessary permitting of the project improvements. In sum, the project, described herein, will replace the existing high service pumps (HSP s) as they have reached the end of their useful life. The water storage reservoirs A and B were rehabilitated and the tray aerators replaced in Justification The Norwood WTP is located at 1033 Escambia Street in Jacksonville, Florida between Norwood Avenue and Highway I-95. The basic layout of the plant and surrounding area are shown in Figure 1. The WTP was constructed in 1950 and was designed for a base load of 5.76 million gallons per day (MGD) with a firm capacity of 8.64 MGD and a maximum pumping rate of MGD with all pumps. The original technical specifications are shown in Figure 2. Norwood currently supports downtown Jacksonville along with Fairfax WTP. The average flow for the plant is currently around 3.45 MGD because of increased support from Main Street WTP after being offline for maintenance. Figure 3 shows the operating conditions for Norwood between January 2014 and January The High Service Pumps currently installed have come to the end of their useful life and are to be replaced with similarly sized modern horizontal split case pumps. The existing pumps are sized for an ideal operation of around 2000 GPM at 150 feet of head. The new pumps will be similarly sized to maintain pumping capacity at Norwood in the event that the Fairfax WTP needs to be taken offline for any reason, in which case the and Norwood WTP would be required to support their shared service areas. 1

2 Figure 1 2

3 Average Daily Flow (GPM) Pressure (PSI) NORWOOD HIGH SERVICE PUMP REPLACEMENT Figure Flow GPM Pressure /22/2013 6/10/ /27/2014 7/15/2015 1/31/2016 8/18/2016 3/6/2017 Date (1/1/2014-1/1/2017) Figure 3 3

4 Scope NORWOOD HIGH SERVICE PUMP REPLACEMENT The Project will be comprised of the replacement of all four currently installed HSP s with four new pumps of similar capability and capacity. This includes sizing, purchasing, planning the shutdown of the plant, and the installation and testing of the new pumping hardware. A plant shutdown simulation may be required to verify the effects of taking the Norwood WTP offline for any extended period of time. JEA operations will need to ensure that the Norwood WTP service area will be covered by the nearby plants at Fairfax and Main Street. General engineering requirements include the following: Engineer shall obtain as-built facility drawings and existing equipment specifications from JEA. Engineer shall perform existing facility inspections, obtain required measurements and observe operation and operational tests. Engineer s design shall be in accordance with JEA WTP Design Standards and JEA Water and Wastewater Standards Manual (2017 or later edition) as amended by the JEA project team. Equipment types, specifications and acceptable suppliers shall be those approved by the JEA Standards Committee where applicable. Pump Replacement The four existing pumps are to be replaced with four horizontal split case pumps of similar size. JEA will perform hydraulic modeling of the system to determine flow and pressure requirements for the Norwood WTP. This information will be utilized by the engineer to select pump ratings. The specific design requirements and criteria for pump replacement include the following: Replacement of existing 150 HP pumps with 150 HP motor driven pumps with VFDs. Replacement or modification of concrete pump bases, as required to suit proposed pumps. Pumps shall be horizontal split-case, single-stage, double-suction pumps of dual-volute configuration. Pump performance, motor size and Hydraulic Institute test tolerances shall be specified such that motor nameplate horsepower is not exceeded under any operating condition. Pumps shall be of cast iron construction with 316 stainless steel impellers. Materials of construction shall meet Federal and State requirements for lead content in contact with drinking water. Pump motor synchronous speed shall not exceed 1,200 RPM for motors of 250 HP and larger and 1,800 RPM for smaller motors. Motors shall be inverter duty rated for VFD operation Pumps shall be equipped with cartridge type mechanical shaft seals. Maximum allowable sound level for pump motors (including VFDs) shall be specified consistent with OSHA levels that do not require hearing protection. Electrical System Upgrades The existing pumping station receives power from a JEA pad mounted transformer located at the southwest corner of the building. The service disconnect is a 1600 ampere main circuit breaker housed in a 480 volt MCC which distributes power to HSPs and other station equipment. The service and MCC will be replaced as part of this project. Design criteria and scope are as follows: New 480 volt utility electrical service Standby generator is not required New electrical room in former chlorination room 4

5 New MCC in proposed electrical room High service pumps variable frequency drives (VFDs) integral to MCC Harmonic distortion limits per IEEE 519 Relocate PLC/SCADA equipment to electrical room Routing of new HSP motor feeders and controls to electrical room in extended floor trench Connection of all existing and new equipment to new MCC Lighting per Illumination Engineering Society (IES) Fire Alarm per NFPA and Fire Marshall recommendation Equipment layout in electrical room in compliance with fire egress requirements New wiring from reservoir exhaust fans to new MCC Short circuit, protective device coordination and arc flash analysis including equipment labeling per NFPA 70E Removal of existing telemetry cabinet and other cabinets which are no longer utilized Replacement of existing HSP discharge magnetic flow meter and transmitter and existing discharge pressure transmitter Modification of PLC programing and control/instrumentation wiring to allow for VFD operation including start-stop sequence based on discharge pressure/flow, pump failure and low reservoir level cut-off and speed control based on system pressure. Engineer shall develop control strategy. JEA will provide programming. Implementation Schedule Project Name FY 2017 RFP Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Project Name FY 2018 RFP Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Engineering Design Duration = 240 days Project Name FY 2019 Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Procurement Bid Duration = 150 days Construction Duration = 360 Days 5

6 Construction Project Name Closeout Duration = 180 Days FY 2020 Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Project Management & Delivery Stage Project Definition 10% Schematic Design 30% Conceptual Design 90% Detail Design 100% Final Design Bid Construction To Project Delivery Planning PEC PEC PEC PEC PEC PEC OPB Established Trend Trend Trend Cost Estimate and Expenditure Forecast (Current $) McDuff WTP HSP Replacement Contractor Cost Percent Material Labor Equipment Contractor Cost TOTAL Pumping Equipment $420, $420, Piping $350, $350, MCC (including VFDs) $140, $140, Electrical Service Upgrade $49, $49, Equipment Wiring $70, $70, Instrumentation & Controls $49, $49, Building Renovation $35, $35, $333, Contingency 30% Total Contractor Costs $0 $0 $0 $1,113,000 $1,446,900 Additional Direct Costs Material Labor Equipment Other/Sub- Cont. TOTAL JEA Supplied Material & Labor $0 $0 $0 $0 $0 JEA Contingency 0% $0 $0 $0 $0 $0 Total Direct Costs $0 $0 $0 $1,113,000 $1,446,900 JEA Cost & Engineering Labor Sub-Cont. TOTAL Project Management 3% $42,000 $42,000 Engineering 12% $175,000 $175,000 Services During Construction 6% $35,000 $45,500 $80,500 Miscellaneous - (Permitting, 1% $8,500 $8,500 etc.) Total: JEA Cost and $0 $77,000 $8,500 $220,500 $306,000 Engineering Total Project Costs $0 $77,000 $8,500 $1,333,500 $1,752,900 6

7 PROJECTED EXPENDITURE FORECAST BY FISCAL YEAR (x 1,000) ACTIVITY FY 17 FY 18 FY 19 FY 20 TOTAL QUARTER 4th 1st 2nd 3rd 4th 1st 2nd 3rd 4th 1st 2nd 3rd JEA Cost & Engineering, 10% $3 $3 $31 $37 JEA Cost & Engineering, 30% $38 $50 $88 JEA Cost & Engineering, Final $64 $45 $5 $36 $44 $46 $41 $38 $319 Construction $193 $310 $330 $280 $191 $1,304 Closeout $2 $3 $5 TOTAL $3 $3 $69 $114 $45 $5 $229 $354 $376 $321 $231 $3 $1,753 SIGNIFICANT MATERIAL SUMMARY DESCRIPTION UNIT MEASURE QUANTITY CONSTRUCTION Risks If the proposed improvements are not made to the Norwood WTP facility there is a higher risk of failure of the current on site hardware. Temporary removal of the Norwood WTP from service for the HSP construction upgrades will increase reliance upon the Fairfax and Main Street WTPs. A plant shutdown simulation should be modeled to confirm that operational reliability can be maintained. 7

8 Revision History Name Date Version Revision Notes Mike Hersey 8/24/17 Updated specific details and reference to recently completed work. Added project Expenditure Forecast. 8