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SECTION 02830
IRRIGATION STANDARD SPECIFICATIONS
PART 1 - DESCRIPTION
1.01 General Work in this section consists of all labor, materials, and equipment necessary to install the irrigation system as indicated on the plans and includes, but not necessarily limited to: Lawn and shrub sprinkler system automatic controller and remote control valves, the proper execution of the work, including trenching, boring under driveways, walks, and curbs, installation of pipe sleeves, and backfilling. PART 2 - MATERIALS 2.01 Submittals A. Before any irrigation system materials are delivered to the job site, submit to the Owner a complete list of all irrigation system materials proposed to be furnished and installed. Show manufacturer’s name and catalog number for each item, furnish complete catalog cuts and technical data, and furnish the manufacturer’s recommendations as to method of installation. B. Provide at least one person who shall be present at all times during execution of this portion of the work, and who shall be thoroughly familiar with the type of materials being installed, and material manufacturer’s recommended methods of installation, and who shall direct all work performed under this section. The Contractor shall have a minimum of 5 years experience in commercial or residential lawn irrigation installation 2.0 2 Materials A. Polyvinyl Chloride (PVC) Pipe
- All mainlines and transmission lines shall be Schedule 40 PVC; laterals shall be Class 200 PVC. Pipe shall be rigid unplasticized conforming to ASTM D-1784 and D- standard specifications for PVC pipe. The pipe shall be homogeneous throughout and free from visible cracks, holes, foreign materials, blisters, deleterious wrinkles, and dents.
- All pipe shall be continuously and permanently marked with the following information: Manufacturer’s name or trademark, size, schedule and type of pipe, working pressure at 73 oF (23oC), and National Sanitation Foundation (N.S.F.) approval. B. Risers
- All stationary spray heads shall have risers of high density polyethylene plastic pipe (“funny pipe”) with spiral barbed ell fittings. Minimum length of “funny pipe” shall be eighteen inches (18”) (450mm).
- All rotor pop-up sprinklers shall have an adjustable pre-assembled double swing joint riser. Swing joints shall be Lasco or Spears Marlex ells MIPT x FIPT or equal approved in advance by the City. Swing joints shall be twelve inches (12”) (300mm) long and shall be threaded on both ends. The swing joint riser shall be of proper pipe size to match head threads. C. Manual Valves
- All manual ball valves, sizes three-inch (3”) (75mm) and smaller, shall be full ported ball valves with maximum working pressure of 175 psi (1200kPa) and 350 psi (2400kPa) hydrostatic test pressure.
- All manual gate valves of four-inch (4”) (100mm) size or larger shall be iron body, brass trimmed, double disc wedge type with integral taper seats and with non-rising stems, and shall be Mueller A-2360 resilient wedge gate valves with mechanical joints or equal accepted in advance by the City. All manual gate valves shall be 200 psi (1380kPa) rated. D. Valve Boxes
- All remote control valves, manual control valves, zone shut-off valves, ball valves, or globe valves unless otherwise indicated, shall be installed in valve access box of proper size as required for easy access to the valve.
- Valve boxes shall not be located within a playing field. Valve boxes shall be placed with a minimum of five feet (5’) (1.5m) separation between each valve box. E. Sprinkler Heads
- All heads of a particular type and for a particular function in the system shall be of the same manufacture and shall be marked with the manufacturer’s name and identification, in such a position that they can be identified without being removed from the system. F. Automatic Irrigation Controllers
- Field controllers shall be model numbers and manufacturers as shown on the plans or an acceptable equal.
- Field controllers shall be installed on approved concrete bases in accordance with the manufacturer’s recommendations as shown on the drawings.
- Field controllers shall be installed with manufacturer’s lightning and surge protection.
- Solvent weld fittings shall be manufactured by Lasco, Spears, or acceptable equal. All lateral line fittings and mainline fittings two inches (2”) (50mm) and smaller shall be schedule 40 solvent weld fittings. J. Pipe Sleeves
- Pipe sleeves shall be Schedule 40 PVC pipe, or equal. K. Concrete
- All concrete shall be 3,000 psi (20,700kPa) at 28 days, transit mixed. Provide certifications with each delivery. L. Other Materials
- All other materials, not specifically described, but required for a complete and proper irrigation system installation, shall be new, first quality of their respective kinds, and subj ect to the approval of the City. PART 3 - EXECUTION 3.01 Product Handling A. Use all means necessary to protect irrigation system materials before, during, and after installation and to protect the installed work and materials of all other trades. B. In the event of damage, immediately make all repairs and replacements necessary to the approval of the City and at no additional cost to the Owner. 3.02 Surface Conditions A. Inspection
- Prior to all work of this section, carefully inspect the installed work of all other trades and verify that all such work is complete to the point where this installation may properly commence.
- Verify that trenching may be completed in accordance with the original design and the referenced standards.
- In the event of discrepancy, immediately notify the City. Do not proceed with installation in areas of discrepancy until all discrepancies have been fully resolved. 3.03 Trenching A. Perform all trenching required for the installation of items where the trenching is not specifically described in other sections of these Specifications.
B. Make all trenches in accordance with OSHA Requirements with sufficient width to provide free working space at both sides of the trench and around the installed item as required for gluing, joining, backfilling, and compacting while minimizing width of trenches. C. All mainline shall have a minimum cover of fourteen inches (14”) (350mm) and a maximum cover of twenty inches (20”) (500mm) above the pipe. All laterals shall be the same depth as the mainline. All lateral and main lines shall be installed in a straight line with no arching or bending of pipe. Change in direction of pipe shall occur only with the use of proper fittings only. D. Where trench excavation is inadvertently carried below proper elevations, backfill with material approved by the City and then compact to provide a firm and u nyielding subgrade to the approval of the City and at no additional cost to the Owner. E. Trench Bracing
- Properly support all trenches in strict accordance with all pertinent rules and regulations.
- Brace, sheet, and support trench walls in such a manner that they will be safe and that the ground alongside the excavation will not slide or settle, and that all existing improvements of every kind will be fully protected from damage.
- In the event of damage to such improvements, immediately make all repairs and replacements necessary to the approval of the City and at no additional cost to the Owner.
- Arrange all bracing, sheeting and shoring so as to not place stress on any portion of the completed work until the general construction thereof has proceeded far enough to provide sufficient strength.
- Exercise care in the drawing and removal of sheeting, shoring, bracing, and timbering to prevent collapse or caving of the excavation faces being supported. F. Grading and Stockpiling Trenched Material
- Control the stockpiling of trenched material in a manner to prevent water running into the excavations.
- Do not obstruct surface drainage but provide means whereby storm and waste waters are diverted into existing gutters, other surface drains, or temporary drains. G. All trench excavation shall be made by open cut. During excavation, material suitable for backfilling shall be piled in an orderly manner a sufficient distance from the banks of the trench to avoid overloading, and to prevent slides or cave-ins. The Contractor shall remove all material not required for backfill or not suitable for backfill, from the site. Banks of trenches shall be kept as nearly vertical as possible, and shall be properly sheeted and braced as may be necessary to prevent caving.
A. The trenching shall not be backfilled until inspection by the City has been completed and the pipe installation, including the grade, alignment, and jointing has been found to be in compliance with the requirements of the plans and specifications. B. Select backfill material consisting of sand, fine gravel or select earth, free of large lumps or rocks larger than one inch (1”) (25mm) shall be used in backfilling around and over the installed pipe. C. The select material shall be obtained from the excavation material removed from the trench and shall be processed by screening, sifting, or selective sorting, so as to produce the type of backfill herein specified. The Contractor may at his option and own expense provide an acceptable imported material. D. This backfill material shall be carefully deposited around and over the pipe in layers not more than six inches (6”) (150mm) thick, loose measurement, unless otherwise permitted by the City, wetted to optimum moisture content and uniformly compacted to at least 95 percent of the maximum density obtainable at optimum moisture content as determined by AASHTO T99 Method A or D (latest revision), until the pipe has a cover depth of at least 14 inches (14”) (350mm). E. The remaining depth of the trench shall be backfilled with excavation material removed from the trench, which shall be wetted or dried to near optimum moisture content. 3.07 Field Measurements A. Make all necessary measurements in the field to ensure precise fit of items in accordance with the original design. 3.08 Installation of Piping A. Perform all trenching and backfilling as specified by the specifications in this Section. B. Lay out the piping system in strict accordance with the plans. Where piping is shown on the plans to be under paved areas, but running parallel and adjacent to planted areas, the intention is to install the piping in the planted areas. C. All mainlines and laterals shall be installed with twelve inches (12”) (304 mm) minimum cover, and a maximum of eighteen inches (18”) (457 mm) cover, over the pipe. D. All lines shall have a minimum clearance (horizontal and vertical) of four inches ( 4 ”) (100mm) of adjacent pipe from each other, and six inches (6”) (150mm) from lines of other trades, except through pipe sleeves. Parallel lines shall not be installed directly over one another. E. Carefully inspect all pipe and fittings before installation, removing all dirt, scale, and burrs and reaming as required; install all pipe with all markings up for visual inspection and verification.
F. PVC Pipe
- Plastic pipe shall be installed in a manner so as to provide for expansion and contraction as recommended by the manufacturer.
- All plastic joints shall be solvent-weld joints. Only the solvent cement recommended by the pipe manufacturer shall be used. All plastic pipe and fittings shall be installed as outlined and instructed by the pipe manufacturer and it shall be the Contractor’s responsibility to make arrangements with the pipe manufacturer for any field assistance that may be necessary. The Contractor shall assume full responsibility for the correct installation.
- All plastic to metal joints shall be made with plastic adapters.
- The solvent-weld joints shall be made dry.
- The solvent-weld joints shall be allowed to set at least 24 hours before pressure is applied to the system on PVC pipe.
- Swing joints shall be installed on the same side of the pipe as the head. Swing joints may not cross pipe laterally. G. Thrust Blocks
- Provide concrete thrust for all pipe as required by the following schedule: Sizes Pipe Tees and Dead Ends Elbows 22 ½ degrees 45 degrees 90 degrees Length Height Length Height Length Height Length Height In Mm In Mm In mm In mm In mm In mm In mm In mm In mm 3- 75- 100 24 600 12 300 9 225 12 300 17 425 12 300 21 525 18 450 6 150 33 825 18 450 12 300 18 450 24 600 18 450 32 800 24 600 8 200 40 1000 24 600 16 400 24 600 30 750 24 600 45 1125 30 750 10 250 50 1250 30 750 20 500 30 750 40 1000 30 750 61 1525 36 900 12 300 61 1525 36 900 28 700 30 750 56 1400 30 750 87 2175 36 900
- All thrust blocks shall bear directly on undisturbed earth. Pipe shall be centered in the middle of thrust block. Contractor shall install a plastic barrier between the thrust block and the pipe and/or wires, so as not to encase them in the concrete thrust block. 3.09 Installation of Equipment A. All fittings, valves, etc. shall be carefully placed in the trenches as shown on the plans.
- All control wires shall be clearly labeled, by station, using weatherproof material, both at the controller and at the valve. The outside cover of all automatic valve boxes shall also have the station number clearly stamped on the cover.
- All sprinklers, having adjustable nozzles, shall be adjusted for proper and adequate distribution of the water over the coverage pattern of the sprinkler.
D. Final Inspection
- Thoroughly clean, adjust, and balance all systems. E. Demonstrate the entire system to the Engineer, proving that all remote control valves are properly balanced, that all heads are properly adjusted for radius and arc of coverage, and that the installed system is workable, clean, and efficient. 3.11 Record Drawings A. Dimension from two permanent points of reference (buildings, monuments, sidewalks, curbs, pavement, etc.). Locations shown on as-built drawings shall be kept day to day as the project is being installed. All dimensions noted on drawings shall be neat and legible. Show locations and depths of the following items: Point of connection Routing of sprinkler lines Ball valves Sprinkler control valves Quick coupling valves Routing of control and power wires Sprinkler heads Other related equipment B. Record drawings must be delivered to the Owner upon completion. 3.12 Operations and Maintenance Manuals A. Prepare and deliver to the Owner within ten calendar days prior to completion of construction, all required and necessary descriptive material in complete detail and sufficient quantity, properly prepared in four individually bound copies of the operations and maintenance manual. The manual shall describe the material installed and shall be in sufficient detail to permit operating personnel to understand, operate and maintain all equipment. Spare parts lists and related manufacturer information shall be included for each equipment item installed. Each complete, bound manual shall include the following information:
- Index sheet stating Contractor’s address and telephone number, duration of guarantee period, list of equipment with names and addresses of local manufacturer representatives.
- Complete operating and maintenance instructions on all major equipment. B. In addition to the above maintenance manuals, provide the maintenance personnel with instructions for system operation and show written evidence to the Owner at the conclusion of the project that this service has been rendered.
C. Final payment will not be made until record drawings and operation and maintenance manuals have been submitted and approved. 3.13 Warranty A. Warranty requirements will be submitted to Owner upon substantial completion of work. B. The Contractor shall winterize the system and perform spring start-up of the system during the guarantee period. These functions shall be coordinated in advance with the Owner, and the Owner’s personnel shall be encouraged to participate.
- Upon re-energizing the system, the Contractor shall repair any leaks or breaks and shall check each head and valve, making any adjustment necessary. 3.14 Crossing and Repairing Existing Irrigation Systems A. The Contractor shall coordinate all work with the City of Lakeland for locating the existing irrigation pipelines. The ends of the pipe shall be cleaned and plugged with a solvent weld cap. The pipeline shall be kept clean and free of debris. B. After installation and backfilling the Contractor shall expose the irrigation crossings and repair the pipeline in accordance with this specification. The Contractor shall coordinate his activities with the City of Lakeland to ensure that the lines are adequately flushed and leak tested at static pressure following the repairs. END OF SECTION
