HomeMy WebLinkAboutRP 05-12A; AGUA HEDIONDA OUTER LAGOON; HYDRAULIC EVALUATION; 2013-12-06ARCAD1S
The Water Division of ARCADIS
Imagine the result
RECEIVED
DEC 10 2013
LAND DEVELOPM
KIEWIT SHEA DESALINATION ENGINEERING
Hydraulic Evaluation of Plant
Potable Water and Fire
Protection Water Mains
Carlsbad Desalination Plant, RP 05-12A
December 6, 2013
:c7 O:24
Hydraulic Evaluation of
Plant Potable Water and Fire
Protection Mains
Jena L Prior, PE
Project Civil Engineer Carlsbad Desalination Facility
Venkatraman Radhakrishnan, PE
Staff Mechanical Engineer
Preparedb
Kie4t Shea DesInaon
Paad by
ARCADIS U.S., Inc.
410 N. 44th Street
Suite 1000
Phoenix
Arizona 85008
Tel 602 438 0883
Fax 602 438 0102
IIARCAOIS
Our Ref.:
4354003.002
Dale:
6" December 2013
This document is intended only for the
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was prepared and may contain
information that Is privileged, confidential
and exempt from disclosure under
applicable law. Any dissemination,
distribution or copying of this document is
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______I V2 ARCADIS 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
t:i Protection Mains
Carlsbad Desalination Facility
1. 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.
Hydraulic Evaluation of
Process Water and Fire
______ I ra 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
______I Va ARCADIS Protection Mains
Carlsbad Desalination Facility
Table 3-1 In-Plant Water Demands
Area Building Fixtures #(GPM)
Q 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
00 Administration
Building Building Fixtures (By Square Footage)' 9491 4 4 4 4
700 Cleaningl
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
Hydraulic Evaluation of
Process Water and Fire
______ 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
Legend
CMWD Connection
Junctions (by pressure)
<40psi
40 psi - 85 psi
>85psi
Diameter (inch)
2
4
6
8
10
8ç' çS'
24
Irrigation Demand Irrigation Demand
18 gpm 19 gpm
is
V
4" Recordail Compund Series Meter (Badger Meter)
+
Sources Esri DeLorme NAVTEO. USGS Intermap iPC NRCAN, Esri Japan ME i Esri China (Hong Kong. Esri(Thailand). lomlorn, 201J S.LF' bri
DiqitaiGlohe GeoEye. i-cubed USDA USGS AEX, Gotmapping. Aerogrid IGN swisstopci. ,eid the GIS User Community
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
______ 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 during 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.
men o_hØmuIivaIuation updateddemanth 6
Pipe ID: P29
Diameter: 8 in.
Flow: 1118 gpm
Legend Pipe ID. P31 Velocity: 7.1 ft/s
CMWD Connection
+ Diameter: 8 in.
Flow: 118 gpm
Velocity: 0.8 ft/s
Junctions (by pressure)
<20psi
20 - 40 psi Pipe ID P33
40-60 psi 01
..
Diameter: 8 in.
Flow: 2118 gpm
C Velocity 13.5 ft/s
> 60 psi •
DIAMETER
8 Pipe ID: P35
. Diameter: 8 in.
12 \, Flow: 2118 gpm
Velocity: 13.5 ft/s
:i
Pipe ID: P37
Diameter: 8 in. , Pipe ID: P27
Flow: 882 gpm
Velocity: 5.6 ft/s
Diameter: 12 in.
Flow: 4000 gpm
Velocity: 11,4 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: P45
Diameter: 12 in.
Flow: 4000 gpm
Velocity: 11.4 ft/s 4 S5
Pipe ID: P15
Diameter: 12 in.
Flow: 4000 gpm
Velocity: 11.4 ft/s
Pipe ID. P13
Pipe ID. P17 Diameter: 12 in.
Flow: 4000 Diameter: 12 in. -
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
6711 gpm 6,968 gpm
C
6,700 gpm
7.410 gpm
6.778 gpm
7,953
7.122 gpm 7271 gpm
Legend
CMWD Connection
Model Junctions
Pipes (by diameter)
8"
12"
Carlsbad Desalination Facility
Hydraulic Model of Fire Protection Water Mains
Project No.: 04354003.0002
Available Fire Flow
(at 20 psi residual pressure)
FIGURE 4-2