02810 irrigation system

Specifications

SECTION 02810 – IRRIGATION SYSTEM

PART 1 – GENERAL 02810-3/19

1.1 SECTION INCLUDES 02810-3/191.2 REFERENCES 02810-3/191.3 SUBMITTALS 02810-5/191.4 TRANSPORTATION, HANDLING AND STORAGE 02810-7/191.5 WARRANTY 02810-7/191.6 QUALITY ASSURANCE 02810-7/191.7 FIELD MEASUREMENTS 02810-7/19

PART 2 PRODUCTS 02810-7/192.1 GENERAL MATERIALS AND EQUIPMENT

REQUIREMENTS 02810-7/192.2 PIPES AND FITTINGS 02810-8/192.2.1 PRESSURE MAIN, LATERAL LINE AND 02810-8/19

BUBBLER LINE PIPES AND FITTINGS 02810-8/192.2.2 PIPE FITTINGS 02810-8/192.2.3 JOINTING SYSTEM 02810-8/192.2.4 PIPING MANUFACTURER’S NAME, NOMINAL

PIPE SIZE, SCHEDULE, PRESSURE RATING & DATE OF EXTRUSION 02810-8/19

2.2.5 FITTING MANUFACTURER’S NAME ORTRADEMARK, MATERIAL DESIGNATIONAND SIZE 02810-8/19

2.3 APPLICATION DEVICES 02810-8/192.4 VALVES 02810-9/192.5 SPECIALIZED VALVES 02810-9/192.6 IRRIGATION CONTROLLER 02810-10/192.7 VALVE BOXES 02810-10/192.8 IRRIGATION WATER PUMPS 02810-10/192.9 ACCESSORIES AND APPURTENANCES 02810-13/192.10 ELECTRICAL WORK 02810-14/192.11 WATER SUPPLY MAIN MATERIALS 02810-14/192.12 MARKER TAPE 02810-14/19

PART 3EXECUTION 02810-14/193.1 EXAMINATION 02810-14/19

3.1.1 PIPES AND PIPE FITTINGS 02810-14/193.1.2 VALVES 02810-14/19

3.2 RELATED WORKS 02810-15/193.3 INSTALLATION OF PIPING SYSTEM 02810-15/193.4 VALVE INSTALLATION 02810-17/193.5 FIELD QUALITY CONTROL 02810-17/19

3.5.1 HYDROSTATIC TESTING 02810-17/193.5.2 INSPECTION 02810-18/193.5.3 REPAIR METHODS 02810-18/19

3.6 POSTING FRAMED INSTRUCTIONS 02810-19/19

IRRIGATION SYSTEM 02810-1/19

Specifications

3.7 FIELD TRAINING 02810-19/193.8 PREPARATION FOR USE 02810-19/193.9 BACKFILL 02810-19/193.10 FLUSHING 02810-19/19


Specifications

SECTION 02810 - IRRIGATION SYSTEM

1. PART 1 - GENERAL

1.1. SECTION INCLUDES

Complete automatic irrigation system, piping and appurtenances as shown on Drawings and as specified herein.

1.2. REFERENCES

SASO – SAUDI ARABIAN STANDARDS ORGANIZATION

SASO 14 Pipes for Potable Water of Unplasticized Plastic (uPVC)

SASO 15 Methods of Testing of Pipes for Potable Water of Unplasticized Plastic (Polyvinyl Chloride PVC)

SASO 412 Method of Testing for Cast Iron Manhole Covers

SASO 413 Cast Iron Manhole Covers.

SASO 237 Methods of Testing for Water Meters

SASO 238 Water Meters

SASO 1238 General requirements for design, installation and evaluation of trickle irrigation systems.

SASO 1244 Permanent sprinkler irrigation system – Part I: General requirements for design, installation and operation.

SASO 1305 Centrifugal Pumps – General Requirements.

SASO 1306 Stationary sprinkler irrigation system – Part II: General Requirements for Testing and Evaluation.

ANSI – AMERICAN NATIONAL STANDARDS INSTITUTE, INC.

A40.1M Gauge-Pressure Indicating Dial Type, Elastic Element (Metric)

ASTM – AMERICAN SOCIETY FOR TESTING AND MATERIALS

ASTM A 47 Malleable Iron Castings


Specifications

ASTM A 48 Gray Iron Castings

ASTM D 636 Tensile Properties of Plastics

ASTM D 1248 Polyethylene Plastic Moldings and Extrusion Materials

ASTM D 1784 Rigid Poly(Vinyl Chloride) (PVC) Compounds and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds

ASTM D 1785 Poly(Vinyl Chloride) (PVC) Plastic Pipe, Schedule 40, 80 and 120.

ASTM D 2287 Non-Rigid Vinyl Chloride Polymer and Copolymer Molding and Extrusion Compounds

ASTM D 2447 Polyethylene (PE) Plastic Pipe, Schedules 40 and 80 Based on Outside Diameter

ASTM D 2466 Poly(Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 40

ASTM D 2467 Socket-Type (Vinyl Chloride) (PVC) Plastic Pipes Fittings, Schedule 80

ASTM D 2564 Solvent Cement for Poly(Vinyl Chloride) (PVC) Plastic Pipe and Fittings.

ASTM D 2609 Plastic Insert Fittings for Polyethylene (PE) Plastic Pipes

ASTM D 2672 Joints for IPS PVC Pipe Using Solvent Cement

ASTM D 2855 Making Solvent-Cemented Joints with Poly(Vinyl Chloride) (PVC) Pipes and Fittings

ASTM D 3139 Joints for Plastic Pressure Pipes Using Flexible Elastomeric Seals

AWWA – AMERICAN WATER WORKS ASSOCIATION

AWWA C500 Gate Valves, 3-Inches through 48-Inches NPS, for Water and Other Liquids

AWWA C506 Backflow Prevention Devices Reduced Pressure Principle and Double Check Valve Types

AWWA C509 (1987) Resilient-Seated Gate Valves for Water and Sewerage Systems


Specifications

AWWA C651 Standard for Disinfecting of Water Mains

AWWA C700 Standard for Cold-Water Meters; Displacement Type

AWWA C702 Standard for Cold-Water Meters; Compound Type.

AWWA M23 PVC Pipe Design and Installation

1.3. SUBMITTALS

Contracting Officer approval is required for submittals with a “GA” designation; The following shall be submitted in accordance with Section 01300 SUBMITTAL PROCEDURES:

SD-01 Data

Framed Instructions.

Labels, signs, and templates of operating instructions that are required to be mounted or installed on or near the product for normal, safe operation.Field Training Data.

Information describing training to be provided, training aids to be used, samples of training materials to be provided, and schedules and notification of training.

Design Analysis and Calculations; GA. Spare Parts;GA.

Design analyses and pressure calculations verifying that system will provide the irrigation requirements. Spare parts data for each different item of material and equipment specified, after approval of the related submittals and not later than the start of the field tests. The data shall include a complete list of parts and supplies, with current unit prices and source of supply.

SD-04 Drawings

Sprinkler System; GA.

Detail drawings for valves, sprinkler heads, and water hammer arresters, automatic controllers and backflow preventers. Drawing shall include a complete list of equipment and materials, and manufacturer’s descriptive and technical literature, performance charts and curves, catalog cuts, and installation instructions. Drawings shall also contain complete wiring and schematic diagrams and any other details required to demonstrate that the system has been coordinated and will function as a unit. Drawings shall show proposed system layout, type and number of heads, and zone valves backflow devices, controllers. As-Built Drawings which provide


Specifications

current factual information showing locations of mains, heads, and valves including deviations from and amendments to the drawings and changes in the work shall be included.

SD-06 InstructionsSprinkler System.

Detailed procedures defining the Contractor’s provisions for accident prevention, health protection, and other safety precautions for the work to be done.

SD -09 Reports

Field Tests.

Performance test reports in booklet form showing all field tests performed to adjust each component and all field tests performed to prove compliance with the specified performance criteria, upon completion and testing of the installed system. Each test report shall indicate the final position of control valves.

SD -13 Certificates

Sprinkler System.

The material supplier’s or equipment manufacturer’s statement that the supplied material or equipment meets specified requirements. Each certificate shall be signed by an official authorized to certify in behalf of material supplier or product manufacturer and shall identify quantity and date or dates of shipment or delivery to which the certificates apply.

SD – 19 Operation and Maintenance Manuals

Sprinkler System.

Six copies of operation and six copies of maintenance manuals for the equipment furnished. One complete set prior to field testing and the remainder upon acceptance. Manuals shall be approved prior to the field training course. Operating manuals shall detail the step-by-step procedures required for system startup, operation, and shutdown. Operating manuals shall include the manufacturer’s name model number, parts list, and brief description of all equipment and their basic operating (features. Maintenance manuals shall list routine maintenance procedures, possible breakdowns and repairs, and troubleshooting guides. Maintenance manuals shall include piping and equipment layout, simplified wiring and control diagrams of the system as installed, and system programming schedule.


Specifications

1.4 TRANSPORTATION, HANDLING AND STORAGE

1.4.1 Follow manufacturers written instructions regarding transportation, handling and storage of various material.

1.4.2 Protect uPVC pipes and fittings from direct sunlight and extreme temperatures.

1.4.3. Do not remove valves/meters end protectors unless necessary for inspection; then re-install for storage. Protect valves/meters from weather. Store valves/meters indoors. If outdoor storage is necessary, support valves/meters off the ground or pavement in watertight enclosures.

1.4.4. Rig valves/meters to avoid damage to exposed valve parts. Do not use handwheels and stems as lifting or rigging points.

1.5. WARRANTY

Submit written guarantee signed by the manufacturer, and the contractor, agreeing to replace defective material or workmanship within 1 year of date of substantial handing over.

1.6. QUALITY ASSURANCE

Comply with the applicable portions of Uniform Plumbing Code (UPC) and Basic National Plumbing Code (BOCA).

1.7. FIELD MEASUREMENTS

The Contractor shall verify all dimensions in the field and shall advise the Contracting Officer of any discrepancy before performing the work.

2. PART 2 - PRODUCTS

2.1 GENERAL MATERIALS AND EQUIPMENT REQUIREMENTS

2.1.1 Standard Products

Materials and equipment shall be the standard products of a manufacturer who has produced similar systems which have performed well for a minimum period of 2 years prior to bid opening. Equipment shall be supported by a service organization that is, in the


Specifications

opinion of the Contracting Officer, reasonably convenient to the site.

2.1.2 Nameplates

Each item of equipment shall have the manufacturer’s name, address, type or style, model or serial number, and catalog number on a plate secured to the item of equipment.

2.1.3 Extra Stock

The following extra stock shall be provided: Two sprinkler heads of each size and type, two valve keys for operating manual valves, two electric valves, two wrenches for removing and installing each type of head, two quick coupler keys and hose swivels and two repair couplings for each type pipe installed.

2.2 PIPES AND FITTINGS

2.2.1. Pressure Main, Lateral Line and Bubbler Line Pipes and Fittings: Unplastisized polyvinyl chloride (PVC) Schedule 80, conforming to ASTM D 1785 or SASO 14 and 15 Class V.

2.2.2. Pipe Fittings: Socket-type unplasticized polyvinyl chloride (uPVC) plastic fittings conforming to ASTM D 2467, Schedule 80.

2.2.3. Jointing System:

.Welded joints using solvent cement conforming to ASTM D 2564.

2.2.4. Piping shall be marked with manufacturer's name, nominal pipe size, schedule or class, pressure rating and date of extrusion.

2.2.5. Fittings shall bear the manufacturer's name or trademark, material designation and size.

2.3. APPLICATION DEVICES

2.3.1. General: As applicable for the particular device, rates of application and operating pressure of bubblers and lawn sprinklers shall be as shown on drawings and as specified herein.

2.3.2. Bubblers: Manufacturer's standard, pressure-compensating type (20 and 90 psi), temper resisting, non-corrosive plastic and rubber construction, with inlet filter screen.

2.3.2.1.For shrubs and ground covers, provide pressure-compensating bubblers, full circle pattern with a flow rate of 0.25 GPM at 20 psi operating pressure.


Specifications

2.3.2.2.For trees, provide pressure-compensating bubblers, full circle pattern with a flow rate of 0.50 GPM at 20 psi operating pressure.

2.3.3. Lawn Sprinklers:

2.3.3.1.Small Lawn Areas: Provide pop-up spray sprinklers with plastic nozzles, precise and uniform spray pattern as indicated on drawings. Radius of throw shall be minimum 3.35 m (11 ft) with flow of 1.80 GPM flow at 25 psi operating pressure.

2.3.3.2.Small Lawn Areas: Provide impact rotor pop-up spray sprinklers with brass nozzles, full and/or part circle, precise and uniform spray pattern as indicated on drawings.

2.3.4. Drip Emitters : Pressure-compensating type, of highly resilient elastomer orificed diaphragm, self-cleaning and resistant to tearing and abrasion, with internally barbed outlet to provide watertight connection between distribution tubing, and constant flow from each outlet despite pressure changes.

2.3.4.1. For shrubs and ground covers, provide pressure-compensating single-outlet emitters with a flow rate of 0.50 gph at 15 psi operating pressure.

2.3.4.2. For trees, provide pressure-compensating multi-outlet emitters with a flow rate of 1.00 gph/outlet at 15 psi. each emitter shall have the number of outlets open per tree as shown on the drawings.

2.4 VALVES

Valves shall be as specified in Section 15100 - VALVES.

2.5 SPECIALIZED VALVES

2.5.1. Quick Coupling Valves: Low pressure loss type, with male or female threads. Provide brass or bronze valves and covers. Valve body shall be 2-section type with removable upper body and supplied with stainless steel spring loaded locking covers. Valves shall be operated by insertion of a compatible hollow coupler key. Valves shall be operated by a 90 turn in clockwise direction with reverse turn for closure. Size of valve shall be as indicated on Drawings.

2.5.2. Electric Remote Control Valve Non-pressure regulating type valves shall be used for the bubbler system and pressure regulating type valves shall be used


Specifications

for the lawn areas. Control valve shall have a plastic body, bonnet construction, with CP self-flushing nylon screen, pressure regulating range of 15-100 psi (+/- 5 psi), Schrader valve on PRS module, fluid resistor, low power requirement, flow control stem, manual open/close control; 24 Volt AC 50/200 cycle solenoid power requirement; 200 psi operation rating. Connect remote control valves to irrigation controller on site and coordinate time of operations as well as the necessary adjustments. Size of valve shall be as indicated as indicated on Drawings.

2.6. IRRIGATION CONTROLLER

2.6.1. Provide an independent station, multi-valve capacity, automatic sequencing controller type, capable of automatic or manual operation of remote control/ solenoid valves over an individually variable time from 2 through 60 minutes (in 1 minute increment); from 1 through 6 hours (in 1 hour increment) based on 14-day cycle for every day starts for a 2-week period. Controller shall be weather-proof and shall have the capability to operate number of stations shown on drawings.

2.6.2. Wiring from controller to valves: Conform to the requirements of Section 16050 - BASIC MATERIALS AND METHODS. Size and type of wiring cables shall be as recommended by valve manufacturer.

2.7 VALVE BOXES

As specified in Clause 2.9 of this Section.

2.8. IRRIGATION WATER PUMPS

2.8.1 Furnish and install variable speed controlled by frequency convertor micro-processor factory-fabricated and tested automatic water pressure booster system consisting of diaphragm type pressure tank, centrifugal pumps, power and control panels, instrumentation and operation. Package type booster pumping system shall be of type capacity as shown on the drawings.

2.8.2 Pumps: Provide centrifugal, multi stage, inline-suction vertical type pumps with mechanical shaft seals. Mount each pump on vibration isolator and connect them with reinforced flexible pipe connection on discharge line.

Provide temperature probe and eccentric purge valve immediately upstream of each PRV. Pump capacities shall be shown on the drawings.


Specifications

2.8.3 Motors: Lead and lag pumps shall be driven by a drip-proof shaft motor, capacity and power ratings as shown on the drawings. Each pump motor shall meet NEMA standards and operate within the available service factor at any point on the pump capacity-head curve.

2.8.4 Pressure Tank: Provide factory-precharged diaphragm type pressure tank of required size with replaceable flexible membrane. Construct in accordance with ASME Code and provide ASME stamp of 70 psi minimum pressure.

2.8.5 Method of Operation: Refer to drawings.

2.8.6. Controls:

2.8.6.1.Power and Control Panel: Furnish a single enclosure power and control panel, NEMA 1, hinged door, lockable for booster pump system. Enclosure shall be steel and furnished with an oven-baked enamel. The panel shall include for each pump a fused disconnect switch with external operating handle, starter with 3-leg overload protection, running light and multiple position motor control switch and discharge pressure gauge. It shall also house all control components and include 380 volt control transformer with control power switch, indicating lights, including time relays, audio-visual alarm system, suction pressure gauge and other necessary controls. All of the above shall be factory internally pre-wired and tested in accordance with the provisions of the National Electrical Code. Panel shall have the UL listings or equivalent mark for industrial control panels.

2.8.6.2.Control panels shall incorporate hand-off-automatic selector switches, magnetic starters with thermal overload protectors on all legs, circuit breakers, control transformer, necessary relays and a green pilot light for each motor. An automatic alternator changes main pump sequence every 24 hours to equalize pump operating time.

2.8.6.3.Pressure and temperature sensing control package shall include a thermal sensing device. If the pump casing temperature rises to an undesirable level during very low flows, this device activates a purge valve to relieve the system of heated water.

2.8.6.4.Control includes or in combination thereof:

a. Lead Pump Failure: Starts lag pump upon loss of discharge pressure and sounds optional alarm and/or lights indicator light on panel. Manual reset.

b. Low Suction Pressure Shut-Off: Stops all pumps upon loss of


Specifications

suction pressure. Indicator light panel. Optional audible alarm. Manual reset.

c. High System Pressure Shut-Off: Instantaneously shuts off pump when pressure in system reaches predetermined point. Indicator light on panel. Manual reset.

d. No flow shut-off to turn off all pumps at no flow condition. Automatically turns lead pump back on when system pressure drops a minimum of 10 psi and maintains operation for a minimum of 2 minutes.

e. Low liquid level shut-off to shut-off all pumps at low level in pump suction reservoir, with weatherproof level switch.

2.8.6.5.Controller shall be fitted with "LCD" display to provide full information on system status.

2.8.7. Factory Pre-Fabrication:

2.8.7.1.The entire booster system shall be factory pre-fabricated on a common structural steel stand with all interconnecting piping and wiring completed and operationally tested prior to shipment. Complete package shall include isolation valves on the suction and discharge of each pump. Galvanized steel suction and discharge pipe manifolds, as well as copper tubing with shut-off cocks for gauges and pressure switches, will be furnished assembled. The only field connections required will be the system suction and discharge and power connection at the control panel.

2.8.7.2.All like parts of same type pumps fabricated by the same manufacturer shall be interchangeable.

2.8.7.3.Whenever possible, the pump shall be manufactured such that it shall be possible to disassemble the rotor assembly with minimum disassembly of other parts such as suction and discharge nozzles, bearing supports, etc., being left in place.

2.8.7.4.All castings shall be clean without defect. Casting repairs shall be done only after agreement is reached between the Consultant and the Contractor.

2.8.7.5.All foundry and machine work shall be in accordance with good practice for the class of work involved.

2.8.7.6.All parts shall conform to the required dimensions and shall be free from defects that will prevent proper functioning of the pump.

2.8.7.7.Assembly of parts shall be wall fitted and smoothly operating.


Specifications

2.8.7.8.All internal parts, such as impeller, requiring surface treatment shall be sprayed with PVC epoxy primer in accordance with pump manufacturer's standard practice.

2.8.7.9.Pump sets shall be assembled as completely as possible as a unit including base plate, driver, couplings and guards, lubrication, seal flush, etc., as the requirement allows. Seal flush systems shall be equipped with appropriate controls-strainers and filters as recommended by the manufacturer.

2.8.7.10. Pump exterior shall be sprayed with PVC epoxy primer and shall be painted to meet specific application requirements in accordance with pump manufacturer's standard practice.

2.9 ACCESSORIES AND APPURTENANCES

2.9.1 Valve Keys for Manually Operated Valves and Quick Coupler Valves

Valve keys shall be 1 5 mm diameter by 1000 mm long, tee handles and keyed to fit valves.Quick coupler valves shall be of same construction as quick coupler and designed to fit and actuate valve. Provide three keys, with one key outfitted with hose bibb.

2.9.2 Valve Boxes

Valve boxes shall be plastic, lockable, for valve manifolds or each gate valve, manual control valve and remote control valve. Box sizes shall fit for valve used. Word “IRRIGATION” shall be cast on cover. Install no more than three valves per box.

2.9.3 Pressure Gauges

Pressure gauges shall conform to requirements of ASME B40. I, single style pressure gauge for water with 115 mm dial brass or aluminum case, bronze tube, gauge cock, pressure snubber, and siphon. Scale range shall be suitable for irrigation sprinkler systems.

1. Service Clamps

Service clamps shall be bronze flat, double strap, with neoprene gasket or “O”-ring seal.

2.9.5 Water Hammer Arresters

Water hammer arrester shall conform to the requirements of ASME Al 12.26. 1 M;


Specifications

stainless steel construction with an encased and sealed bellows compression chamber.

2.9.6 Backflow Preventers

Reduced pressure principle assemblies, double check valve assemblies, atmospheric (nonpressure) type vacuum breakers, and pressure type vacuum breakers shall be tested, approved, and listed in accordance with FCCHR-01. Backflow preventers with intermediate atmospheric vent shall be in accordance with ASSE 1012. Reduced pressure principle backflow preventers shall be in accordance with ASSE 1013.

2.10ELECTRICAL WORK

Wiring and rigid conduit for electrical power shall be in accordance with NFPA 70.

1. WATER SUPPLY MAIN MATERIALS

Tapping sleeves, service cut off valves, and connections to water supply mains shall be. in accordance with Section 02668, WATER DISTRIBUTION SYSTEM.

2.12MARKER TAPE

Marker tape shall be provided at minimum height of 300 mm above the buried pipeline in a trench during backfilling. Detectable tape shall be 300 mm width, 100 micron nominal thickness and obtained from approved supplier. It shall be printed in Arabic and English alternately with words CAUTION; BURIED IRRIGATION LINE.

3.PART 3 –EXECUTION

3.1. EXAMINATION

3.1.1. Pipes and Pipe Fittings:

3.1.1.1. Examine visually pipes and pipe fittings for scratches, damages, cracks, delaminations, crushing and weathering. Damaged pipes and pipe fittings shall not be installed.

3.1.1.2. Clean pipes and pipe fittings prior to installation.

3.1.1.3. Discard adhesives and other piping materials that are beyond their stamped expiry dates as well as leaking and opened containers.


Specifications

3.1.2. Valves:

3.1.2.1. Examine valve interior through the end ports for cleanliness, freedom from foreign matter, and corrosion. Remove special packing materials used to prevent disc movement during shipping and handling.

3.1.2.2. Actuate valves through an open-close and close-open cycle. Examine significant features as guides and seats made accessible by such actuation.

3.1.2.3. Examine mating flange faces for conditions that might cause leakage. Check bolting for proper size, length, and material. Check gasket material for proper size, material composition suitable for service, and freedom from defects and damage.

3.1.2.4. Replace defective valves with new valves.

3.2. RELATED WORKS

3.2.1. Trenching and bedding for underground piping shall conform to Section 02222- EXCAVATION, TRENCHING AND BACKFILLING FOR UTILITIES SYSTEMS.

3.2.2. Dewatering: Dewatering, where required, shall conform to the requirements of Section 02200 - EARTHWORK.

3.2.3. Pipelines Crossings under Roads: Conform to the requirements of Section 02222 – EXCAVATION, TRENCHING AND BACKFILLING FOR UTILITIES SYSTEMS.

3.3. INSTALLATION OF PIPING SYSTEM

3.3.1. Installation - General:

3.3.1.1. Install pipes, fittings, and valves in accordance with the requirements of AWWA M23.

3.3.1.2. Inspect pipes, fittings and valves for soundness and for imperfections of coatings, wrappings and linings prior to installation.

3.3.1.3. Deflection at joints shall not exceed the maximum deflection recommended by the pipe or coupling manufacturer for each type of joint and each size of pipes.

3.3.1.4. Blocking shall be permitted only where indicated.

3.3.1.5. Install temporary piping, valves, meters, gauges, and equipment


Specifications

required for hydrostatic testing and disinfecting in accordance with detailed approved working drawings.

3.3.2 Trenching

3.3.2.1. Trench around roots shall be hand excavated to pipe grade when roots of 50 mm diameter or greater are encountered. Trench width shall be 100 mm minimum or 1 1/2 times diameter of pipe, whichever is wider. Backfill shall be hand tamped over excavation. When rock is encountered, trench shall be excavated 100 mm deeper and backfilled with silty sand (SM) or well-graded sand (SW) to pipe grade Trenches shall be kept free of obstructions and debris that would damage pipe. Subsoil shall not be mixed with topsoil. Existing concrete walks, drives and other obstacles shall be bored at a depth conforming to bottom of adjacent trenches. Pipe sleeves for bored pipe shall be two pipe diameters larger than sprinkler pipe.

3.3.3 Cover

3.3.3.1. Underground piping shall be installed as to meet the minimum depth of backfill cover specified.

3.3.4 Clearances

3.3.4.1. Minimum horizontal clearances between lines shall be 100 mm for pipe 50 mm and less; 300 mm for 65 mm and larger. Minimum vertical clearances between lines shall be 25 mm.

3.3.5 Sprinklers and Quick Coupling Valves: Shall be installed plumb and level with terrain.

3.3.6 Backflow Preventers: Shall be installed in new connection toexisting water distribution system, between connection and control valves. Backflow preventer shall be installed with concrete pads.

3.3.7 Control Wire and Conduit

3.3.7.1 Wires

Low voltage wires may be buried beside pipe in same trench. Rigid conduit shall be provided where wires run under paving. Wires shall be number tagged at key locations along main to facilitate service. One control circuit shall be provided for each zone and a circuit to control sprinkler system.

3.3.7.2 Loops

A 300 mm loop of wire shall be provided at each valve where


Specifications

controls are connected.

3.3.7.3 Expansion and Contraction

Multiple wires shall be bundled and taped together at 6 m intervals with 300 mm loop for expansion and contraction.

3.3.7.4 Splices

Electrical splices shall be waterproof

3.3.8 Automatic Controller

Exact field location of the existing controller shall be determined before installation. Coordinate the electrical service to these locations.

3.3.9 Thrust Blocks

Install thrust blocks at bends, tees plugs, and valves of 80 mm (minimum) pipe.

Concrete shall be placed so that sides subject to thrust or load are against undisturbed earth, and valves and fittings are serviceable after concrete has set. Thrust blocks shall be as specified in Section 02668 - WATER DISTRIBUTION LINES.

3.4. VALVE INSTALLATION

3.4.1. Locate valves for easy access and provide separate supports where necessary. Install valves in a position allowing full stem movement.

3.4.2. Install valves using flanged connections. Align flange surfaces parallel. Assemble joints in accordance with the valve manufacturer's recommendations for gasketing and bolting.

3.5 FIELD QUALITY CONTROL

3.5.1. Hydrostatic Testing:

3.5.1.1 Underground piping to be tested shall be partially backfilled with joints exposed during test unless otherwise directed by Contracting Officer.

3.5.1.2. Protect exposed joints from direct sunlight during testing. Perform hydrostatic testing so that the temperature of test water shall not exceed 40 degree C during the test period.


Specifications

3.5.1.3. Provide temporary thrust resistance using wooden supports at changes of direction prior to hydrostatic testing of assembled piping.

3.5.1.4. No adhesive-bonded piping shall be pressurized until joints have cured in accordance with the Manufacturer's instructions.

3.5.1.5. Conduct Hydrostatic tests in presence of Contracting Officer, and prior to coating joints and disinfecting. Conduct hydrostatic tests after the associated concrete works has set for a minimum of 7 days for standard concrete.

3.5.1.6. Place test pump on firm ground away from piping. Pump shall have a calibrated and tagged relief valve set at 10 percent above the test pressure or a maximum of 170 kPa above test pressure for pressure piping systems.

3.5.1.7. Use a calibrated and tagged pressure gauge of the proper range for testing pressure piping systems.

3.5.1.8. Perform hydrostatic test using fresh water. Fill pipeline 24 hours prior to testing.

3.5.1.9. Pressure test for the water distribution mains shall be 1035 kPa (150 psig) or 345 kPa (50 psig) above the operating pressure, whichever is greater.

3.5.1.9.1. Test lines whose joints have been backfilled at the above mentioned pressure test for 24 hours.

3.5.1.9.2. Test lines whose joints have not been backfilled at the above mentioned pressure test for 4 hours.

3.5.2. Inspection:

3.5.2.1. Examine exposed pipes, joints, fittings, valves, and hydrants for eakage during hydrostatic testing.

3.5.2.2. Replace leaking pipe, joints and fittings in accordance with the requirements specified herein.

3.5.2.3. Repeat hydrostatic testing after the repair of defects until the system is proved satisfactory.

3.5.2.4. Piping shall be satisfactory if there is no evidence of leakage or pressure loss after the specified test period.

3.5.3. Repair Methods:

3.5.3.1. Conform to the requirements specified herein for the provision of


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new materials required for replacement at the defected areas.

3.5.3.2. Conform to the manufacturer's recommendations for permanent and temporary repairs of piping.

3.6 POSTING FRAMED INSTRUCTIONS

Framed instructions wiring and control diagrams in laminated plastic shall be posted where directed. Condensed operating instructions, prepared in typed form, shall be framed as specified above and posted beside the diagrams. The framed instructions shall be posted before acceptance testing of the system.

3.7 FIELD TRAINING

A field training course shall be provided for designated operating and maintenance staff members. Training shall be provided for a total period of 4 hours of normal working time and shall start after the system is functionally complete but prior to final acceptance tests. Field training shall cover all of the items contained in the operating and maintenance manuals.

3.8. PREPARATION FOR USE

3.8.1. After completion of hydrostatic tests, drain lines in an approved manner.

3.8.2. Remove temporary test piping and equipment that will no longer be required.

3.8.3. Field Coating: After completion of hydrostatic tests and before disinfecting, prime or re-prime as required and provide a protective coating to uncoated metal components of piping system, including joints, tie rods and harnesses as specified herein, except exposed ends of steel pipes up to couplings shall be wrapped with hot applied coal tar tape.

3.9. BACKFILL

3.9.1. Trench backfilling shall conform to the requirements of Section 02222 – EXCAVATION, TRENCHING AND BACKFILLING FOR UTILITIES SYSTEMS.

3.9.2. Marker Tape: Install continuous, marker tape during backfilling of trench for underground services. Locate tape 300 mm below finished grade.

3.10. FLUSHING

General: On completion of the system tests, the system is to be thoroughly flushed, the velocity of water being at least 1 m/sec. Should the main water supply be unavailable or inadequate for this purpose at the time of flushing, then a swab of adequate size construction shall be used to remove all foreign matter in the pipeline. This process shall continue until the pipeline is completely clean. Each control valve


Specifications

shall be opened separately and the terminal systems also thoroughly flushed with clean water.

END OF SECTION


02810 irrigation system

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