For use in the Denver Water Service Area |
The Board Of Water Commissioners
Denver Water
Engineering Standards
Chapter 5 – System Design And Layout
5.01 General:
The purpose of this chapter is to provide information on the design and layout of water distribution systems acceptable to Denver Water. The following criteria shall apply equally to the City and County of Denver, Total Service Areas, and Distributor Contract Areas.
Denver Water has designed and built its system using conduits as the backbone for supplying all distribution systems. The distribution system then delivers water to the individual customer in sufficient volumes and without excessive headloss. The design and layout criteria in this chapter apply to distribution systems only. Design and layout criteria for conduits are covered in Chapter 10.
In some instances conduits supply transmission mains, which then deliver water to the individual customer. Chapter 9 deals with the design and layout criteria for transmission mains.
5.02 Quality Of The Distribution System:
The purpose of these Engineering Standards is to ensure that only proven high quality materials are installed using first class workmanship. Determination of the best materials and construction methods are based upon lowest life cycle costs, not upon lower initial costs. Sizing and layout of the system are parts of the total consideration of design, operation and maintenance of a water supply system that yields optimum quality service at the lowest total cost to the consumer.
5.03 Sizing Of Distribution Mains:
All mains shall be sized large enough to provide for domestic, irrigation, and fire protection flows to the area requesting service. The maximum acceptable headloss for 6, 8, and 12 inch mains is 2 feet per 1,000 feet of main for the maximum hour flow using a C value of 130. The 2 feet per 1,000 feet of main does not apply under fire flow conditions. Denver Water reserves the right to size mains to provide service for future needs.
All new mains shall be of one of the standard sizes set by Denver Water. Standard sizes are 6 inch, 8 inch, and 12 inch mains. Mains smaller than 6 inches may be used in some cul-de-sacs if approved by Denver Water.
The sizing of Distribution Mains follows a standardized grid based upon careful consideration and analysis of results of distribution system studies utilizing network simulation. This grid requires a 12 inch main every half mile with alternating 6 inch and 8 inch mains in the streets within the quarter section and a 6 inch or 8 inch main in the street at approximately the 1/16 line to eliminate half mile runs in the system. See Sheet 9 of the Standard Drawings for a typical grid layout.
In residential areas the main shall be 8 inches in diameter. Six inch diameter pipe may be used where it completes a grid, but it is not to be used in blocks more than 600 feet in length unless approved by Denver Water. Four inch mains may be acceptable in cul-de-sacs serving only 6 taps or less.
In business and industrial areas an 8 inch main is used only where it completes a grid. Twelve inch mains are used for long runs not interconnected.
Planned building groups are treated the same as industrial or business areas because of the high fire risk, the large number of long single feeds and the minimal intersection of mains.
In adherence to the recommendations of the Insurance Services Offices, for economic reasons and as a fire service obligation, looping shall be done in conjunction with the main extension.
The present sizing of the grid system has the benefit of utilizing the system as an integral part of the overall transmission system in that water is distributed without excessive headloss. Denver Water shall analyze grid systems for developing areas to determine their adequacy. Parallel mains are not allowed.
5.04 Fire Protection Systems:
A. Fire Hydrants: The number and location of fire hydrants in a given area is determined by the appropriate fire protection bureau. Normal practice is to install fire hydrants on the northeast corner of the street intersections. If hydrants are to be installed at locations other than street intersections, they shall be located on lines, which are established by extending property lot side lines into the streets. See Sheet 7 of the Standard Drawings.
Fire hydrant branch lines shall be set at right angles to street mains. The hydrant shall be set at the end of the branch line and shall face the branch line. No horizontal or vertical bends or reducers shall be used in fire hydrant branch lines unless specifically approved by Denver Water. Under no circumstances shall any size or manner of tap be made on a fire hydrant branch line.
A dead-end main shall have no more than one fire hydrant connected to it, except as specifically approved in writing by Denver Water or Distributor.
B. Firelines: Connections made to existing mains and run to the property line to provide water for fire protection systems are known as firelines and their sizes are determined by those persons responsible for protecting the structures served.
Firelines shall be installed at right angles to the Distribution Mains and shall run straight from the mains to the property lines. No horizontal or vertical bends shall be installed in these lines, except in the case of making a wet tap where the tap location conflicts with an existing pipe joint or where interference prohibits a straight line installation. Such horizontal or vertical bends shall be used only when specifically approved by Denver Water.
C. Backflow Prevention: An approved backflow prevention assembly must be installed on all water service connections that supply a fire protection system. See 6.11
5.05 Operating Pressures Within The Distribution System:
Pressures within the distribution system shall be a minimum of 40 psi during the maximum hour demand and a maximum of 110 psi static pressure in the main. The maximum pressure fluctuation at any location in the distribution system between maximum hour demand and minimum hour demand shall not exceed 30 psi.
5.06 Pressure Regulating Stations:
Pressure regulating valve (PRV) installations are used to control pressures within distribution systems. When main extension plans are submitted for review the need for a pressure regulating valve installation will be determined based on existing pressure zones and the existing distribution system layout. Within Denver and Total Service Areas, PRV setting(s) are to be included on plans with the following information: elevation, upstream and downstream hydraulic grade line and pressure, with Denver Water making all pressure settings and field adjustments. On plans submitted in Master Meter and Read and Bill areas, which require a PRV, Denver Water reserves the right to verify the settings. PRV(s) connected to Denver Water conduits shall be owned and maintained by Denver Water.
In certain situations, Denver Water shall require monitoring of the valve(s) via supervisory control and data acquisition (SCADA) equipment. The equipment used shall be of the manufacture and type specified or approved by Denver Water. See 5.12.
5.07 Storage Facilities:
A. Installation: Water storage facilities will be allowed for storing water from Denver Water's system where specifically authorized and approved by Denver Water.
B. Cleaning and Drainage: Storage facilities shall have built-in provisions for draining as well as access and provisions for cleaning including a suitable source of water. The cleaning and drainage facilities shall be subject to the approval of Denver Water.
C. Electronic Monitoring Equipment: Denver Water may require the installation of supervisory control and data acquisition (SCADA) equipment for storage facilities of the type specified by Denver Water. See 5.12.
5.08 Electric Pump Motors:
All motors shall be polyphase squirrel-cage rotor induction motors. Each motor shall be capable of delivering adequate starting and running torque sufficient to meet all the electrical, and operating conditions of the installation, and shall conform to MS-24. Motor sizing shall not make use of the service factor. Each motor shall be rated for direct across-the-line, full voltage, starting. Each motor shall be controlled by a motor starter which employs a method of starting consistent with the requirements of the electric power utility, the plant power system, and consideration of extended motor life and reliability and acceptable voltage drop during starting. Each starter shall be equipped with motor protective devices in the form of: overload relays; phase reversal, phase loss, and undervoltage relay trips; ground fault detection; motor winding and bearing overtemperature alarm and trip; and any other such functions as may be required by Denver Water for a particular installation.
All pump motor installations shall maintain an overall plant power factor between 0.9 and 1.0 lagging under normal operating load. If necessary, each motor shall be equipped with power factor correcting capacitors, as required, in order to meet this.
Each motor shall be designed and constructed to operate, without damage in reverse rotation at the maximum speed obtainable with the connected pump acting as a turbine under the conditions given by the approved hydraulic system design.
5.09 Pumping Facilities:
A. General: Pumping facilities will be allowed on mains or services supplying water from Denver Water's system only where specifically authorized by Denver Water. Denver Water shall prohibit the installation of pumping facilities where, in Denver Water’s opinion, such installations would be injurious to the operation, or future operation, of Denver Water's system.
Material, equipment, and construction shall conform to applicable or specified codes and standards, and shall be approved by Denver Water.
B. General Design Criteria: Pump stations receiving water from Denver Water shall conform to the following requirements regardless of function or location:
1. Secured against unauthorized entry.
2. Located and in a manner, that will allow easy and safe access for maintenance and inspection.
3. Provide ventilation in the pump station designed to prevent the entry of small animals and insects.
4. Provide heating and cooling, to insure safe and efficient operation of all piping, pumping equipment, instrumentation, and alarms.
5. Size pumping capacity to provide fire demand; maximum day demand; maximum hour demand; or replenishment whichever is greater.
6. Provide means for measuring flow on pump discharge header(s).
7. Provide corrosion protection for underground steel and iron.
8. Provide local and remote electronic telemetry equipment of the type specified by Denver Water for monitoring discharge pressure and pump motor status. See 5.12.
9. Provide frost proof gravity line or sump pump for pump station drainage.
10. Provide means to prevent water from backing up into the pump station from other sources (e.g. check valve on drain line).
11. When economically feasible, standardize equipment to permit interchangeability with that of other equipment.
12. Special care shall be exercised in the selection of pumping units and associated components to prevent pressure surges and insure the suitability, flexibility, and adaptability of the units to the hydraulic conditions of the system from which water is taken and the system into which water is pumped.
13. The horsepower rating of each pump motor shall be such that the motor will carry continuously the maximum load that is possible to develop at any point on the pump curve without exceeding the motor nameplate rating and without using the service factor. The motor shall conform to the requirements of 6.46.
14. Provide that all pumps are located to receive positive suction head or meet the manufacturer's required net positive suction head.
15. Electrical design, equipment selection, and installation practices are subject to prior approval by Denver Water. Three copies of single-line drawings showing the power system, switchgear, protective devices, feeder panels and wiring, and motor controllers along with sizing, fault current, and protective device coordination calculations shall be submitted. The latest edition of the NEC, OSHA's "Design Safety Standards for Electrical Systems", and applicable ANSI/IEEE Standards shall set the minimum standards to which all design, equipment, and installation must conform. Denver Water may set higher standards if the requirements of safety or reliability require them.
16. Provide slow-closing regulating/check valves on all smaller pumps (0-2,000 gallons per minute) to minimize water hammer.
17. Provide ample clearances between equipment for operation and maintenance activities.
18. Provide electrical outlets and lighting on walls as needed in the pump room.
19. Provide certified manufacturer’s pump performance curves.
C. Conditional Design Criteria: Depending on the function and the location of the pump station any or all the following criteria may be required by Denver Water:
1. Building architecture is to be aesthetically pleasing and compatible with the surrounding area.
2. Provide attractive, water conserving landscaping around pump station, and exterior and interior lighting.
3. Provide access and parking for vehicles on pump station site.
4. Provide fencing for securing area around pump station and transformers.
5. If applicable, provide space for future additions of pump(s) and piping.
6. Provide heating and cooling in pump station.
7. Provide a means to lift heavy equipment -- bridge crane or access for a boom crane.
8. Provide throttling control with appropriate discharge valves and controls.
9. Provide emergency power supply for telemetry, lights, drain sump pump, and any other necessary items.
10. Provide surge control.
11. Install guard valves on each side of pumping unit.
12. Systems shall be capable of supplying adequate fire protection during power outages.
13. Provide resistance temperature detectors in stator windings of pump motors for remote alarming upon overheating.
14. Provide spare pump for backup capability.
15. Provide pump and motor bearing high temperature sensors for remote alarming and lock out relays to shut down pump and motor (upon bearing overheating).
16. Provide aquastat over temperature shutdown switch on pump to protect from overheating. The aquastat shall not contain any mercury.
17. Depending on the motor size and electric power system, provide reduced voltage motor starters.
18. Provide dual transformers cross connected with tie breaker and separately switched for isolation.
19. Provide remote control for all pumps, gas engines, and filling valves (start - stop - position discharge valve).
20. Provide local and remote instrumentation for monitoring the following:
a. Discharge valve positions
b. Discharge header pressure and flow
c. Reservoir level (if applicable)
d. Upstream pressure (if applicable)
e. Suction header pressure (if applicable)
f. Pump status (on-off)
g. Gas engine stand-by generator status (on-off)
h. Total kilowatt demand (station)
21. Provide sensors and alarms to detect the following remote and local):
a. Water on the floor
b. Bearing high temperature for each pumping unit bearing
c. Motor windings high temperature for each pumping unit
d. Pump building door intrusion
e. High and low room temperature
f. Electrical ground fault
g. Low accumulator pressure (if applicable)
h. Power failure
i. High and low reservoir level (if applicable)
j. Fire and/or smoke
5.10 Layout Of The Distribution System:
A. General: Mains shall be installed in dedicated public streets of the width defined below and of such grade, alignment, curvature, and other characteristics as to permit them to be laid and maintained in the normal and usual manner. When Denver Water determines it is not feasible for an installation to be made in a dedicated street, the installation shall be made in a Denver Water or Distributor easement.
The conditions under which such an exception will be allowed will be determined for each individual case, and only easements which conform to the terms of Denver Water's standard easement form and these Engineering Standards will be accepted. The easement requirements defined herein must be complied with prior to acceptance of any existing system for Total Service.
B. Alignment: Main alignment shall be parallel with dedicated right-of-way or easement lines. Normal practice is to lay the main on the north or east side of the street 5 feet or 10 feet from the centerline of the street. In all cases where main alignment is within an established public or private roadway, the main shall be installed between the limits of curb and gutter pan, roadside drainage ways, or other such roadway limits except as specifically authorized by Denver Water. Also, there shall be a minimum of 10 feet from any edge of the dedicated right-of-way or easement to the centerline of the main, except as otherwise approved by Denver Water.
C. Easement Width Requirements:
1. Dedicated Street: The cross section of a dedicated public roadway shall meet the minimum requirements of a 28 foot surfaced roadway flow line to flow line with an additional 2-1/2 feet on each side for the installation of fire hydrants, behind sidewalks and curbs, as shown on Sheet 3 of the Standard Drawings.
2. Public dedicated roadways designed with islands at entrances to developments must comply with the following criteria:
The island must be located in the middle of the roadway (approximately) and/or in such a manner as to allow for an unencumbered minimum width of 20 feet from back of curb of island to back of curb or roadway. The water line must be installed on the side of the island that is at least 20 feet wide as described above and preferably have no other utilities installed within that 20 foot wide area.
3. Private Roadways: The easement shall have a minimum width of 30 feet and Denver Water or the Distributor shall have exclusive use of 20 feet thereof, except for right angle utility crossings. The cross section of a private roadway must have as a minimum:
a. Twenty-six feet of surfaced roadway with a 4 foot wide attached sidewalk, making a total of 30 feet of surfaced area from back of curb to back of sidewalk as shown on Sheet 4 of the Standard Drawings,
OR
b. Twenty-nine feet of surfaced roadway with 6 inch wide concrete curbs, making a total of 30 feet of surfaced area from back of curb to back of curb, as shown on Sheet 4 of the Standard Drawings,
OR
c. Thirty-feet of surfaced roadway with permanent delineation on both sides, the type, material and location of which is pre-approved by the Property Management Section as a part of the plan review process, and where neither cross section on Sheet 4 of the Standard Drawings is practical.
d. Roadways designed with islands at entrances to developments shall have easements that extend across the entire roadway including the island, with the island located (approximately) in the middle. The water line shall be installed on a side of the island that is at least 20feet wide from back of curb to back of curb and will have no other utilities installed therein. All other utilities shall be confined to the opposite side of the island.
An easement conforming to the terms of Denver Water’s Standard PUD/PBG form of easement agreement shall be granted to Denver Water.
3. Undeveloped Areas: The minimum width easement in which distribution mains will be installed is a 30 foot exclusive or a 50 foot non-exclusive easement.
D. Alleys: New installation or replacement of a water main in an alley is strictly prohibited.
E. Fire Hydrants: All fire hydrants shall be installed within dedicated streets or in the easements as defined above. When Denver Water determines it is not possible or feasible for a hydrant to be installed in this manner, it shall be installed in an easement contiguous to said street. The fire hydrant easement shall have a minimum width of 10 feet, if the length is 25 feet or less. Fire hydrant easements shall have a minimum width of 30 feet when the length of the easement is more than 25 feet. The easement shall extend a minimum of 5 feet beyond the center of the hydrant. See Sheet 7 of the Standard Drawings.
Fire hydrants shall be installed only at locations authorized by the appropriate fire protection bureau.
5.11 Line Valves:
Line valves are required approximately every 600 feet in all distribution systems receiving water from Denver Water. Where blocks exceed 600 feet in length, or if 2 or more hydrants are connected to the same main, additional line valves are required in the middle of the block. Street intersections carrying heavy traffic, or containing major water distribution mains in both directions, require 4 valves, one on each extended property line. For a succession of short blocks perpendicular to the direction of major feed and without residential services between, several intersections may have the valve omitted in that direction but should retain the 600 feet interval requirement. A line valve is required between fire hydrants in commercial, residential and industrial areas.
5.12 Connections To Conduits:
All connections to conduits owned or controlled by Denver Water shall be installed by Denver Water unless otherwise authorized by Denver Water. Denver Water shall provide and install, at cost, all fabricated pipe, tapping saddles, valves, etc., that are necessary to construct the connection.
5.13 Supervisory Control And Data Acquisition (Scada):
Supervisory Control and Data Acquisition (SCADA) installed for use by Denver Water to monitor, control and coordinate the operations of the water system, or the operations between a Distributor’s water system and Denver Water’s system, shall be designed, installed, and maintained according to the following standards and practices:
A. General:
1. Equipment and instruments SCADA shall be in accordance with MS-29 subject to approval by Denver Water.
2. Construction and installation of this equipment shall be in accordance with design drawings and specifications submitted to and approved by Denver Water prior to commencement of construction of the system. Designs and specifications shall be prepared using ISA industry standard electrical/electronic and instrumentation symbols and drafting practices. Any changes in design or equipment specifications on approved plans shall require reapproval by Denver Water before the changes are implemented in the system. Only drawings approved by Denver Water’s Process Control Section shall be used for construction and installation of the SCADA system.
a. For systems requiring 15 I/O points or less (in any combination of analog and digital points) and containing no more than one closed loop control loop, the following documentation is required.
Control viewpoint containing an overview of how the system is to operate including: a listing of digital and analog I/O points, control loop descriptions, set points, normal operating ranges, alarm points operating sequence and operator interface information. The control viewpoint is used for check-out, start-up, system revisions and maintenance.
Equipment list detailing the following for all equipment and instruments: equipment tags to be used throughout drawings (ISA standards preferred), manufacturer and model number, and a concise description of the manufacturer’s specifications as they apply to the requirements of the process. Manufacturer’s cut-sheets and literature shall accompany this list. The equipment list is used by Denver Water’s Process Control Section to review equipment submitted for approval, and as a cross-reference guide for the drawing package.
Instrumentation and Control P&ID Typical showing the instruments and associated equipment interconnections in block form using ISA standards. The nomenclature established on the equipment list should be used here. The flow of signals shall move from left to right across the drawings. Normal operating points, signal levels, frequencies, and instrument adjustments shall be shown. P&ID’s are intended to be used for design and installation. See Sheet 68 of the Standard Drawings.
Instrumentation and Control Cabinet Layout Typical including layouts for all operating stations, push-button stations, terminal boxes, control equipment enclosures, etc., to clearly show the location of all panel-mounted telemetry/control system components. Panel layout drawings are intended to be used for fabrication, installation and maintenance. See Sheet 66 of the Standard Drawings.
Instrumentation and Control Detail and Schedules Typical including a parts/instrument material schedule for all equipment located in enclosure, name plate schedule, panel cut-out details, etc. These drawings are also intended for use in fabrication, installation and maintenance. See Sheet 67 of the Standard Drawings.
Instrumentation and Control Ladder Diagram Typical showing all necessary electrical connections to equipment in schematic form and ladder logic, if applicable. Any set points or other information pertinent to the installation of the system shall be included. All information regarding power requirements shall be shown, including: main power feed capacity, voltage and origin; and transformer and power supply available load and operating voltage
Wiring details such as wire numbers, colors and sizes, along with terminal numbers/names for all terminals whether off a terminal strip or instrument terminal, is required. Concise nomenclature for all equipment functions is required. Schematics are intended for use in fabrication, installation and maintenance. See Sheet 64 of the Standard Drawings.
Software documentation in the form of a hard copy printout and a 3-1/2 inch diskette copy of the completed program is required, if applicable.
b. For systems requiring more than 15 I/O points or containing more than one closed loop control loop, the following drawings are required along with those outlined above:
Instrumentation and Control Site Diagram Typical showing the relative locations of all panels and field mounted instruments in plan view and using the designated nomenclature from the equipment list. Component layouts are intended to aid in installation and maintenance. See Sheet 69 of the Standard Drawings.
Instrumentation and Control Wiring Diagram Typical showing the actual wiring interconnections from terminal in graphical form. This drawing is used for installation and check-out and is not expected to be maintained after start-up. See Sheet 65 of the Standard Drawings.
3. Equipment and wiring shall be installed and mounted in such a manner as to provide easy access and protection from mechanical and thermal damage as well as condensation or other forms of moisture. NEMA Standards shall be applied for all enclosures. Wiring connections shall be done in a neat workmanlike manner, and shall be laced or bundled using cable ties, or enclosed in PVC wiring duct. In-line splices or wire nuts shall not be allowed. Each end of a wire shall be identified by a permanent wire marker that corresponds to the wire identification used on the final as-built detailed drawings. No more than 2 wires shall be permitted on each terminal block screw. A minimum of 10% of the terminal block positions or din rail space shall be provided as spare for future changes or additions. Twisted, shielded pairs shall be used for all instrumentation wiring for analog devices (4-20mA signals, etc.). Terminations of analog signal wires shall be made by Denver Water’s Process Control Section unless otherwise specified. All low voltage DC wires shall have separate conduit runs from 120VAC and higher voltage wires. Each separate instrument or device in the system shall have affixed to it a permanent identification label corresponding to the final as-built detailed drawings. The latest editions of NEC and OSHA’s "Design Safety Standards for Electrical Systems" shall set the minimum standards of which all design, equipment, and installation must conform. Denver Water may designate additional standards to insure safety, reliability and compatibility with existing systems. Wire coloring code shall adhere to the following:
| 120VAC power - Black | |
| 120VAC neutral - White | |
| GROUND - Green | |
| 12, 24, 48VDC power - Red | |
| 12, 24, 48VDC common - Black w/red stripe | |
| Digital outputs (control) | open, start - Red |
| close, stop - Blue | |
| Digital inputs (status, alarms) - Yellow | |
| Telephone wiring (communication) - Orange | |
4. A site inspection by Denver Water’s Process Control Section is required prior to installation of telemetry/control equipment. Contractor shall notify Denver Water’s Process Control Section at least one week in advance of commencement of the installation to arrange an inspection date. SCADA system operation shall agree with the control viewpoint previously approved. All SCADA systems and equipment shall be subject to inspection and operational acceptance tests by Denver Water’s Process Control Section before being placed into service. All wires shall be inspected for continuity and termination, and all instruments shall be tested to ensure proper operation. Contractor shall notify Denver Water’s Process Control Section one week in advance of the completion of installation to arrange a final inspection date.
5. Pressure transmitters shall be installed in the center of the conduit and "teed" with a pressure sign gauge for local pressure readings. All flow measurements shall be a combination of 2 differential pressure transmitters; a high range transmitter calibrated for the maximum design flow rate and a low range transmitter calibrated to 25% of the maximum design
flow rate. Level transmitters (including pressure transmitters used for level measurement) shall be installed on a separate sensing line. No other instrumentation shall be permitted on this sensing line.
6. Control systems, which incorporate sources of motive power, shall utilize either electrical or hydraulic (oil) fluid power actuator mechanisms. Use of compressed air as a prime motive power source or compressed air powered actuators are not allowed. Use of air over oil accumulators as a source of reserve hydraulic power is allowed. These motive power systems shall be included in the SCADA system drawings submitted for approval. Standard Electrical Industry and National Fluid Power Association drafting symbols and practices shall be used.
7. Three copies of all manufacturer’s instruction manuals, parts lists, and service information, as well as 3 sets of the as-built drawings, control viewpoint and equipment lists shall be provided to Denver Water within 30 days after the completion of start-up and satisfactory performance of the equipment has been achieved, as dictated by Denver Water.
B. Additional Requirements for Coordinating Operations Between a Distributor’s Facility and Denver Water:
1. The required standard for these SCADA systems shall be no higher than those used for telemetry installations made by Denver Water and shall adhere to the specifications outlined in the above 5.13 A. The control viewpoint shall be used as the design standard and written in conjunction with the Distributor and Denver Water’s Process Control Section.
2. SCADA system power shall be provided by the Distributor including all conduit and wires from power source to telemetry and control panel and/or field devices. All other labor related to the design, construction and maintenance shall be provided by Denver Water and paid for by the Distributor, unless otherwise requested by the Distributor and approved by Denver Water.
3. The minimum I/O points required for treated water distribution are:
Up-stream pressure (analog signal)
Down-stream pressure (analog signal)
Valve position (analog signal)
Remote/local control selector switch position (digital signal)
Local open/close valve selector switch (hardwired digital signal)
Valve open command (digital signal)
Valve close command (digital signal)
Water on Floor (WOF) alarm (digital signal)
Vault intrusion alarm (digital signal) - optional
4. All instruments and equipment shall be of a manufacturer and model specified by MS-29, unless otherwise approved by Denver Water’s Process Control Section. Any telemetry and control equipment not specified in MS-29 must be approved by Denver Water’s Process Control Section before purchase by the Distributor.
5. Denver Water shall specify, order and pay for the monthly service of any telephone lines required for the system. The Distributor shall pay for the initial connection fee.
6. Within 30 days after completion of the system, the Distributor shall provide Denver Water with all keys necessary to gain 24 hour access to the telemetry system located at the Distributor’s facility.
7. Any additions, changes, or other modifications to the SCADA system after it has been placed into service must be approved by Denver Water prior to implementation. The required work shall be done by Denver Water unless otherwise requested by the Distributor and approved by Denver Water’s Process Control Section. Distributor shall provide as-built drawings and documentation within 30 days after completion of the approved work to Denver Water’s Process Control Section.
5.14 Interconnects With Other Water Systems:
Interconnections between Denver Water's treated water system and another Denver Water approved system shall only be allowed in accordance with Section 11.02 of the Board's Operating Rules.
A. Semi-Permanent Facilities: Where the location of an interconnection can be identified and included in a written agreement between Denver Water and the other party to the interconnection, such facilities shall be constructed in accordance with Sheet 78 and 79 of the Standard Drawings for a dual feed connection and Sheet 80 for a single feed connection. Such facilities shall normally consist of one or more 6 inch lines, each consisting of meter, check valve, and associated piping as detailed in the drawing. No bypass line shall be included. All other provisions of these Engineering Standards shall apply.
B. Temporary Hose Connections: Where emergency conditions require the use of temporary connections between fire hydrants in order to serve Denver water into another system, such installation shall conform to Sheet 81 of the Standard Drawings. Such conditions shall always include an appropriate meter as described in the drawing.
Activation of interconnections shall be in accordance with Denver Water's standard procedures.
5.15 Flow Measurement:
The Board may require pitot installations for future flow measurement. If so, a corporation stop shall be installed in order to be converted to a pitot installation at a later date as shown on Sheet 82 of the Standard Drawings.
Engineering Standards - Chapter 5:
Revised 07-04, Previous Revision 05-02
End