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Home My WebLink AboutRP 05-12A; CARLSBAD DESALINATION PLANT; HYDRAULIC EVALUATION OF PLANT POTABLE WATER AND FIRE PROTECTION WATER; 2013-12-061 ARCADIS RECORD COPY Imagine the result The Water Division of ARCADIS 3 4- Initial Date 4.. RECEIVED DEC 10 2013 LAND DEVELOPMENT ENGINEERING KIEWIT SHEA DESALINATION Hydraulic Evaluation of Plant Potable Water and Fire Protection Water Mains Carlsbad Desalination Plant, RP 05-12A December 6, 2013 co a: - '4~L4 /0/1~' Jena L Prior, PE Project Civil Engineer Venkatraman Radhakrishnan, PE Staff Mechanical Engineer ______ ARCADIS Hydraulic Evaluation of Plant Potable Water and Fire Protection Mains Carlsbad Desalination Facility PrEpeadr Kiewit Shea Desalinaton Prapesdby ARCADIS U.S., Inc. 410 N. 44th Street Suite 1000 Phoenix Arizona 85008 Tel 602 4380883 Fax 602 438 0102 OzReL: 4354003.002 Dow- 6th December 2013 This document is intended onf for the use of the individual oren* for which,? was prepared and may contain infonnat*n that Is piMiaged, confidential and exempt (mm disclosure under applicable law. Any dissemination, dial,,?jutlon or copying of this document is stflettj prohibited. Confidentiality Statement (optional) IARCADlS Table of Contents Introduction I Model Development I Plant Potable Water System 2 3.1 Design Criteria 2 Fire Protection Water System 6 Tables Table 3-1 In-Plant Water Demands 3 Figures Figure 3-1 Plant Potable Water System 5 Figure 4-1 Fire Protection Water System 7 Figure 4-2 Available Fire Flow 8 4354003.002 Hydraulic Evaluation of Process Water and Fire ______I ra ARCADIS Protection Mains Carlsbad Desalination Facility Introduction A hydraulic model was developed in support of the design of process and fire protection water mains within the Carlsbad Desalination Facility. The model development and evaluation results are summarized in this memorandum. Model Development A steady-state simulation was developed using one of the predominant modeling software packages - InfoWater by lnnovze, Inc. InfoWater software utilizes the standard EPANET simulation engine with additional add-on analysis capabilities such as fire flow analysis. The model was developed and evaluated with the best available data at the time of simulation. Similar to any engineering modeling application, the simulation results are intended for the specific purposes of this project. The following assumptions and conditions apply to the simulation results presented herein: Limited data exists for the supply water distribution system. A bottom tank level was provided for an tank serving the system. It is assumed that the bottom tank elevation is equal to the minimum operating level. It is assumed that an unlimited flow rate is available at the connection point. Based on the tank elevation data provided, it is assumed that this flow rate is provided at a fixed pressure of approximately 86 psi. This evaluation is limited to the water mains on the project site and does not consider any effects of the supply water distribution system. Site water mains are assumed to be PVC material with a Hazen-Williams Roughness Coefficient (C- factor) of 120. Minor losses through valves, bends and hydrant assemblies are not considered in the model. Layouts for the water mains, connections and location of fire hydrants were derived from the site plans for the Carlsbad desalination facility. ffsffm~_hyftL4cmkAAwLupdnWddamrvb Hydraulic Evaluation of Process Water and Fire ______ ARCADIS Protection Mains Carlsbad Desalination Facility 3. Plant Potable Water System The Plant Potable Water mains at the Carlsbad Desalination Facility will be used to supply water from the Carlsbad Municipal Water District's (CMWD) distribution system to satisfy in-plant water demands such as emergency showers, eye washes, analytical instrumentation, and sludge flushing. In-plant demands for each area were developed from the water used by the individual processes. Table 3-1 summarizes the water used by each plant process and the total demand for each area. Total water needed for the all emergency showers and eyewash stations in the plant was estimated to be almost 782 gpm. It is highly unlikely that all these emergency showers and eyewash stations will be utilized at the same time. Therefore, for the purpose of the sizing this Plant Potable Water system, it is assumed that only 3 of these stations are used at one time (69 gpm). All other demands are assumed to be operational for sizing the water mains including irrigation demands. There are two irrigation demands; one On-Site and the other at Carlsbad Boulevard (Figure 3-1). These irrigation demands were estimated at 19 gpm and 18 gpm respectively. Also, the potable water demand for the Administration Building was estimated using CMWD's design guidelines for non-residential buildings. Thus, the Plant Potable Water mains were sized for a total of 647 gpm. (Table 3-1) 3.1 Design Criteria The following hydraulic criteria were used to size the water mains: Velocities in pipes limited to 5 feet per second Headloss gradient in pipes limited to 10 feet per 1000 feet. Pressures in the system maintained above 60 psi. Headloss and velocity criteria violations in 2-inch connections and some short sections of non-critical pipes (approximately 50 feet) were ignored. 2 Hydraulic Evaluation of Process Water and Fire ______ ARCADIS Protection Mains Carlsbad Desalination Facility Table 3-1 In-Plant Water Demands Area Building Fixtures # Q (GPM) Total Q (GPM) Demand Assigned (GPM) Total Demand Assigned (GPM) 200 Pretreatment Emergency Shower/Eye Washes 1 23 23 23 51 Washdown 1 24 24 24 Analyzers 18 0.2 4 4 220 Clearwell/ Electrical Building Emergency Shower/Eye Washes 1 23 23 23 57 Washdown 1 24 24 24 SDI Panel 1 5 5 5 Measurement Panel 1 5 5 5 250 Backwash Pit Backwash Pit Drainage Pump Seal Flushing 1 1 1 1 5 Clarifier Sludge Outlet Flushing 1 4 4 4 260 Solids Handling Sludge Treatment Buffer Tank 1 26 26 26 270 Sludge Pipe Flushing 1 50 50 50 Sludge Pump Feed Flushing 1 62 62 62 Sludge Pump interconnecting Pipes Flushing 1 26 26 26 Centrifuge Flushing 1 62 62 62 Solids Diverter Gate Flushing 1 9 9 9 Polymer Preparation 1 35 35 35 500 Reverse Osmosis Emergency Shower/Eye Washes 1 23 23 23 53 Analyzers 1 6 6 6 Washdown 1 24 24 24 500 Administration Building Building Fixtures (By Square Footage)' 9491 4 4 4 4 700 Cleaning/ Flushing Flushing 1 50 50 50 50 780 Chemical Storage/ Treatment CIP Tanks Drains 1 50 50 50 120 Polymer Preparation 1 70 70 70 Irrigation Onsite - 19 At Carlsbad Blvd - 18 Total (gpm) 647 Note: 'Based on building area (9491 SF), Average Daily Flow (2,300 gal/day/10,000 SF), and Peaking Factor of 2.9 hu8tonupdaIedden Hydraulic Evaluation of Process Water and Fire _____ 1 V2 ARCADIS Protection Mains Carlsbad Desalination Facility Figure 3-1 shows the Plant Potable Water main system with the pipe sizes and delivery pressures at the demand locations. As indicated on the figure, a 10-inch water main conveys the water from the CMWD's distribution system into a loop (6 to 8 inch), which delivers water to various processes through 2-inch connections at the building locations. At the point of connection to the CMWD's distribution system, a 4-inch Recordall Compound Series meter from Badger Meter will be installed to measure flows. A 4 psi headloss experienced through this meter is applied to the hydraulic model 4 2- • # Legend + CMWD Connection Junctions (by pressure) 40 psi 40 psi - 85 psi >85psi Diameter (inch) 2 4 6 8 10 5' so- 4 Irrigation Demand Irrigation Demand 18gpm 19gpm IN 4" Recordall Compund Series Meter (Badger Meter) Sources. Esri. DeLormo NAVTEO USGS. Intermap iPC NRCAN E-,ri Japan METI Esri China Hong Konqi. Esri ilhailandi, TomThm 2013 Sr D tilGl lu GuEyO I J USDA USGS AEX Giti iapinj A r r5 A F vvtup irHhi G'S U- ( unty Carlsbad Desalination Facility Hydraulic Model of Process Water Mains Plant Potable Water FIGURE 3-1 Project No. 04354003.0002 Pipe Sizes & Available Pressures Hydraulic Evaluation of Process Water and Fire Mira ARCADIS Protection Mains Carlsbad Desalination Facility 4. Fire Protection Water System A distinct fire protection water system is designed for the plant (Figure 4-1). This system has a separate connection to the CMWD's distribution system adjacent to the Plant Potable Water connection described above. Regulatory requirements indicate a fire flow requirement of 4,000 gpm at the facility. This is supplied by four hydrants, each providing 1,000 gpm. The hydraulic model described in Section 2 was used to evaluate the capacity of the proposed fire mains. A total of 4,000 gpm was equally divided between the four model nodes located the furthest distance from the connection point. Figure 1 provides the simulation results. As shown on Figure 1, pressures are provided for model nodes; flow rates and velocities are provided for water mains. Due to the consistent elevation at the project site, pressure results are an adequate indicator of the hydraulic grade through the water mains. An approximately 13 psi pressure reduction occurs from the source connection point to the furthest flowing hydrant at the northwest extent of the site water main loop. However, excessive velocities (>10 feet/second) are present dunng a fire flow event. The physical water mains were utilized to evaluate the available fire flow. The available fire flow is defined as the total flow rate that can be conveyed by the water distribution system to any point at a minimum pressure of 20 psi. Figure 4-2 provides a summary of the available fire flow rates throughout the site water mains. Based on the above assumptions and conditions, an 8-inch water main loop with a single 12-inch main to the connection point can deliver an available fire flow rate of at least 8,000 gpm throughout the site water mains. As a result, the fire protection system is designed to meet and exceed the local regulatory requirements for the Carlsbad Desalination Facility. naonupdatedd 6 Pipe ID: P33 Diameter: 8 in. Flow. 2118 qpm Velocity: 13.5 ft/s Pipe ID. P37 Diameter 8 in. Flow: 882 gpm Velocity: 5.6 ft/s Pipe ID: P25 Diameter: 8 in. Flow: 1882 gpm Velocity. 12 ft/s Pipe ID: P21 Diameter: 8 in. Flow: 1882 gpm Velocity: 12 ft/s Pipe ID. P35 Diameter: 8 in. Flow: 2118 gpm Velocity: 13.5 ft/s Pipe ID: P27 Diameter. 12 in. Flow. 4000 gpm Velocity: 11.48/s Pipe ID. P45 Diameter. 12 in. Flow: 4000 gpm Velocity: 11.4 ft/s Legend + CMWD Connection Junctions (by pressure) <20psi 20 - 40 psi 40 - 60 psi > 60 psi DIAMETER 8 12 Pipe ID: P31 Diameter 8,n. Flow: 118 gpm Velocity: 0.8 ft/s Pipe ID: P29 Diameter: 8 in. . . Flow: 1118 gpm Velocity: 7ift/s is - ?2- Pipe ID: P15 Diameter: 12 in. Flow: 4000 gpm Velocity: 11.4 ft/s V Pipe ID: P13 Pipe ID: P17 Diameter. 12 in. Flow: Diameter: 12 in. (: 4000 gpm Flow: 4000 gpm Velocity: 11.4 ft/s Velocity: 11.4 ft/s Pipe ID: P11 Diameter 12 in. Flow: 4000 gpm Velocity: 11.4 ft/s Carlsbad Desalination Facility Hydraulic Model of Fire Protection Water Mains Project No.: 04354003.0002 Fire Protection Water System Fire Flow Simulation Results FIGURE 4-1 N Legend + CMWD Connection Model Junctions Pipes (by diameter) 8" 12" 6,711 gpm 6,968 gpm 6,700 gpm 7410 gpm 6.778 gpm 8,550 gpm 953g 7,122 gpm 7,271 gpm 827 gpm Y 805 gpm \9627 gpm \10,039 gpm \10,471 gpm \11;12-9*1M !rt.!• /_1, ' Carlsbad Desalination Facility Hydraulic Model of Fire Protection Water Mains Available Fire Flow FIGURE 42 Project No.: 04354003 0002 (at 20 psi residual pressure)