SECTION UNDERGROUND SPRINKLER SYSTEM

Transcription

1 SECTION UNDERGROUND SPRINKLER SYSTEM PART 1 - GENERAL 1.1 WORK INCLUDED A. Design and installation of automatic lawn and shrub sprinkler system providing uniform moisture coverage. B. Furnishing of materials and installation of a complete automatic lawn sprinkler system providing uniform moisture coverage. The work shall include all materials, equipment and labor required to complete the project as outlined in the project drawings, documents and this specification. C. Installation of backflow preventer, pressure regulator, irrigation lines (pressurized), automatic control valves, valve boxes, control and common wiring, lateral lines, sprinkler heads, automatic controller as shown on the project drawings and irrigation plan. D. Excavation and backfill. E. Tests including system pressure and performance test. F. Pipe and fittings. G. Sprinkler heads. H. Control system and connection to electrical supply. I. Trenching, installation of system and connection to water source; testing and backfilling. J. Locate and expose ends of all existing sleeves. Shown for use on this project phase. 1.2 RELATED WORK A. None. 1.3 REFERENCES A. ANSI/ASTM D Solvent Cements for Poly Vinyl Chloride (PVC) Plastic Pipe and Fittings. B. ASTM D Poly Vinyl Chloride (PVC) Plastic Pipe (SDR-PR). C. ASTM American Society of Testing Materials D. AWWA American Water Works Association E. NSF National Sanitary Foundation F. NEC National Electric Code 1.4 DESCRIPTION A. Electric solenoid controlled underground sprinkler system consisting of PVC plastic pipe Cherokee Springs Plaza Underground Sprinkler System

2 and fittings, with fixed spray and variable arc rotary pop-up heads in a multi-station electric control system, programmed as approved by Owner's Representative. 1.5 SUBMITTALS A. Submit the irrigation design for review and approval by Owner's Representative no less than two (2) weeks prior to commencing installation operations. The design shall include the piping layout, location and coverage of sprinkler heads, plant and landscaping features, site structures, list of fittings to be used, and control system and wiring diagrams and data; and shall note water pressure at the project site. B. Provide (3) copies of manufacturer's product data for each type of sprinkler head, swing joint assemblies, electric control valves, automatic and manual drain valves, isolation valves, valve boxes, pipe, fittings including tapping tees and saddles, control wire, waterproof wire connectors, irrigation controller, backflow preventer, and rain and freeze sensors proposed for use. C. Determine and submit static water pressure at meter and/or other designated points of connection at least two (2) weeks prior to beginning of installation. Contractor shall receive Architect s approval if static pressure is less than 70 PSI. D. Provide manufacturer's product data for each type of sprinkler head and valve proposed for use. E. Upon completion and final review of system by Owner s Representative, Contractor shall provide as-built drawings (reproducibles) of completed facilities as installed. Drawings shall be provided to Architect in a) electronic form (Autocad 2000 format) b) in a reproducible form of mylar or vellum and c) three (3) copies of the as-built drawing in blueline or photocopy form. As-built drawing shall show the measured distance from easily identified, fixed locations to isolation valves, electric control valves, manual drain valves and wire splices. Two dimensions from fixed points per location are required. F. Upon completion and final review of system by Owner s Representative, Contractor shall provide three (3) binders containing manufacturer s installation, operation and maintenance instructions as well as a parts breakdown and catalog for each piece of equipment installed on the project. As a minimum the binders shall include information for the irrigation controller, booster pump, backflow preventer, pressure regulators, isolation valves, electric control valves, drain valves, air relief valves, all spray and rotary sprinkler heads, rain and freeze and moisture sensors. G. Upon completion and final review of system by Owner s Representative, Contractor shall provide a plastic laminated (sealed) reduced drawing of the irrigation system indicating the areas or zones of the irrigation system controlled by each electric control valve. For clarity, drawing may be divided into two sections and shown on both sides of the laminated sheet. Reduced drawing shall be placed on the inside of the controller door. Drawing shall be approved for clarity by Architect prior to acceptance of system. 1.6 OPERATION/MAINTENANCE DATA AND DEMONSTRATION A. Provide instructions for operation and maintenance of system and controls, and manufacturer's parts catalog. B. Provide schedule indicating length of time each valve is required to be open to provide determined amount of water. C. Provide a recommended schedule for run times and frequency of watering for the first two weeks, the first two months and the first twelve months after completion of the installation. Cherokee Springs Plaza Underground Sprinkler System

3 D. Instruct Owner's personnel in operation and maintenance of system, including adjusting of sprinkler heads. 1.7 EXTRA STOCK A. Provide the following extra stock items: 1. Two sprinkler heads of each type and size. 2. Two valve keys for manual valves. 3. Two keys for valve markers. 4. Two wrenches for each type head core and for removing and installing each type head. 5. Two couplers for each size of quick coupling valve. 1.8 SYSTEM SERVICE A. Inspect system at two and four weeks after Date of Substantial Completion and make necessary adjustments. 1.9 WARRANTY A. Entire sprinkler system will be unconditionally guaranteed against defects in material and workmanship, including repair of settling of backfilled areas below grade and adjusting heads to proper level for a period of one year from Date of Substantial Completion. B. Minor adjustments, any defective electrical controls, valves, sprinkler heads or other working parts will be repaired or replaced without cost to the Owner for a period of one year from the date of acceptance. C. Damage by others during the one-year guarantee period will be Owner's responsibility. D. Warrant sprinkler system to have uniform moisture coverage of areas shown to be sprinkled. PART 2 - PRODUCTS 2.1 MATERIALS- GENERAL A. The specific materials to be used shall be as designated on the contract drawings and this specification. All materials to be incorporated in this work shall be new and of the best quality, meeting the requirements for such materials and for the purpose intended. The irrigation lines on the contract drawings are diagrammatic. The Contractor shall be responsible for computing and supplying the required pipe, fittings, control wires and electrical accessories required to complete the project. B. ACCEPTABLE MANUFACTURERS 1. Weather-matic 2. Rainbird. 3. Hunter. 4. Toro. C. SUBSTITUTIONS: All material shall be supplied and installed according to this specification and the specifications of the equipment and material manufacturers. Should Contractor desire to substitute materials or equipment other than that described in this specification, the following procedures shall be followed: 1. Provide manufacturer's specification for the proposed equipment and show how it is equal or better than the specified equipment. Cherokee Springs Plaza Underground Sprinkler System

4 2. Demonstrate, if required by Owner, the actual performance of the equipment. Receive, from Owner, written approval for the proposed substitution. D. MATERIAL STORAGE: A specific area shall be provided in which all materials to be used on the project shall be stored when not in use. Provision of this land is for the purpose of keeping the property neat and orderly and in no way waives any requirements of the Contractor to protect his equipment and materials from damage by the elements, from theft or from vandalism. 2.2 PIPE AND FITTING MATERIALS A. Pressurized Main Line Pipe: All 2 1/2" and smaller main line pipe shall meet the latest requirements of ASTM D 1785 Standard Specification for Schedule 40 Poly (vinyl chloride) PVC pipe with size as shown on the project drawings. Solvent-weld sockets. B. All main line pipe larger than 2 1/2" shall meet the latest requirements of ASTM D 1784 Standard Specification for Rigid Poly, and ASTM D 2241 Standard Specification for Class 200 Poly (vinyl chloride) PVC Pressure-Rated pipe with size as shown on the project drawings. Rubber gasketed joints. C. All main line pipe to be installed in curved sleeves shall be copper, Type L Soft and shall be the size required to meet the requirements of this specification. All transition fittings to PVC shall be copper sweat socket with threaded MIPT or FIPT connections to the PVC main line pipe. D. Lateral Pipe: All lateral pipe, downstream of the control valves, shall be have solvent weld joints and shall meet the latest requirements of ASTM D 2241 Standard Specification for Poly (vinyl chloride) (PVC) Plastic Pipe with standard dimension ratio (SDR) of 21 and a Pressure Rating (PR) of 200 PSI. E. Sleeving Pipe: All sleeving (straight sections) to protect pipe or control wires at roads, sidewalks or below grade crossings shall be PVC Schedule 40. All sleeves (curved sections) to protect pipe or control wires at sidewalks and below grade crossings shall be high-density polyethylene with a working pressure of 160 psi. Sleeves shall be a minimum of two (2) times the diameter of the crossing pipe or that shown on the project drawings. Minimum sleeve size shall be 2 diameter. All irrigation control wires shall be routed in a separate sleeve. F. Fittings: 1. Tees attaching the electric control valves and quick coupling valves onto the mainline (2 1/2 and smaller) shall be PVC Schedule 80 solvent welded or threaded fittings and shall meet ASTM D 2467 and ASTM D 2464 respectively. PVC Schedule 80 fittings and nipples shall be used on all fittings required between the mainline tap and the electric control valve as well as the threaded connection between the electric control valve and the lateral piping. Schedule 80 fittings shall be Spears Manufacturing or approved equal. Contractor shall use manufacturer s recommended sealing compounds and/or Teflon tape according to manufacturer s recommended practice for the specific application. 2. Mainline fittings (2 1/2 and smaller) at all points of direction change such as 22.5, 45, tees, or 90 degree turns shall be solvent weld with a minimum of Schedule 40 dimensions and shall meet the requirements of ASTM Specification D Schedule 40 fittings shall be Spears Manufacturing or approved equal. 3. Lateral line Fittings - Solvent welded fittings shall be Schedule 40 dimensions and wall thickness and shall meet the requirements of ASTM Specification D 2466 and shall be used on all piping downstream of electric control valves. Cherokee Springs Plaza Underground Sprinkler System

5 G. Solvent Cement: ANSI/ASTM D2564 for PVC pipe and fittings. H. All 1/2" inlet spray heads shall be connected to the irrigation piping utilizing 1/2" thick walled polyethylene tubing (Rain Bird Model SPX-100) and appropriate insert fittings (Rain Bird Models SBE-050, SBE-075, SBA-050, SBA-075). Sufficient lengths of flexible pipe shall be used to form a sweeping arc to ensure that spray heads are supported properly and allow for vertical adjustment and movement during service. I. All 1" inlet quick coupling valves shall be installed on prefabricated, manufactured swing joint assembly rated for 315 psi with pre-lubricated buttress threads and O ring seals equal to Spears Manufacturing Co. Series J. Swing Joints: Prefabricated, schedule 80 PVC, equal to Spears. Use for ground level popup impact driven heads, gear-driven rotary heads, hydrant and quick-coupler valves. K. Drip Irrigation: Pipe and fittings equal to Netafin U.S.A. 2.3 SPRINKLER HEADS AND NOZZLES A. Sizes and types required to provide complete, even coverage with minimum overspray. B. Turf Spray Heads: Equal to 4 Pop-up Rainbird 1804-SAM-PRS with internal check valve and pressure regulator incorporated into stem. Equal to Toro Super 600 series rotary head; and/or Toro 570C-3P. C. Mid-Range Rotor Heads: 4 Pop-up, top screwdriver adjust, rubber cover, water lubricated gear drive with radius reduction adjustment of at least 25 percent. Rotor shall have a 3/4 inlet, check valve capable of holding up to 7 feet of water pressure and a pressure activated wiper seal. Sprinkler shall have enhanced water distribution nozzles to insure even water distribution throughout the spray pattern. Flow shut-off capability shall be provided in the flow path to permit servicing the sprinkler head with the system under pressure. The sprinkler shall have at least a 5 year trade warranty. 4 pop-up rotors shall be equal to Rainbird model 5004-PL-FC-SAM (full circle). 2.4 VALVES A. Master Valves: electrically operated, solenoid valve. Operated by Controller with each Automatic Control Valve. Equal to Rainbrid PEB 2 Master Valve. Install at each Backflow Preventer downstream in Valve Box. B. Automatic Control Valves: Remote, electrically operated, normally closed, diaphragm globe valves. The valve shall have a 200 psi CWP rating. Flow control stem shall be nonrising. The valve cover shall be secured to the body with stainless steel threaded studs and nuts. Bleeding of water during manual operations shall be either internal or external. Control valves shall be contamination resistant, glass filled high strength nylon body and bonnet. Equal to Weather-matic 11024F Series or Rain Bird PEB Series. C. Automatic Control Valves for Low Flow Zones. Remote, electronically operated, normally closed, diaphragm globe valve, equal to Medium Flow Commercial Control Zone Kit with Pressure Regulating Basket Filter XCZ-100-PRB-MC as supplied by Rainbird. D. Isolation Valve For The Electric Control Valve: Ball type, plastic construction, with threaded ends. Valves shall have a maximum pressure rating of 235 psi at 73 degrees F. The valves shall be equal to Spears Model 2131-OXX sized the same as the control valve. E. Gate Valves (Isolation Shut Off Valves): 2 1/2" and smaller - shall be bronze, threaded, screw-in bonnet with non-rising stem rated for a 125 psi WSP and 200 psi non-shock Cherokee Springs Plaza Underground Sprinkler System

6 WOG. The valve shall be of domestic manufacture, shall meet Federal Specifications MSS SP-80 equal to Hammond Model IB645. F. Automatic Drain Valves: Equal to King Technology, Inc. Model 22, 1/2" inlet. G. Manual Drain Valve: Bronze body, angle type 150 psi class, with cross-type operating handle designed to receive a valve operating key. H. Quick Coupling Valves: Equal to Rainbird 5LRC with locking rubber cover with 55DK keys w/ bronze hose swivel adapters, Buckner model Quick coupling valve shall be prevented from rotation with Leemco Model LS-120 valve stabilizer. I. Backflow Preventer And Cover: Reduced pressure device Equal to Wilkens Model 975XL meeting the requirements of the City of Tahlequah for irrigation system use. The backflow preventer shall be installed using Type L copper pipe and shall incorporate two (2) unions for ease of construction. The backflow preventer shall be installed inside a cabinet indicated on drawings, and protected from freezing using thermostatically controlled "heat tape". 2.5 WATER METER A. New 2 turbine style, per City of Tahlequah requirements. 2.6 CONTROLLER A. The Automatic Irrigation Controller shall be a Two-Wire Decoder System capable of fully automatic and manual operation. The controller will be housed in a weather-proof, U.L. approved rainproof housing, w/ pedestal mount. 2.7 VALVE BOXES AND MARKERS A. For Automatic Control Valves: Equal to Carson Industries Inc. model with X extensions as required. B. For Manual Drain Valve: Equal to Carson Industries Inc. model w/ corrugated plastic pipe for extension. C. For Quick Coupling Valves: Equal to Carson Industries Inc. model with X extensions as required. D. For Above Grade Backflow Preventers In Exterior Locations: Fiberglass enclosure equal to Hot Box manufactured by Northeast Florida Enterprises, Inc. 1/ Place on concrete slab and anchor with 4 bolts. Size to fit backflow preventer. Provide electrical connection and heater or heater cable as recommended by enclosure manufacturer. 2.8 CONTROL VALVE WIRING A. Wire for communication between the controller and decoders shall be 14-2 gauge Maxi-Cable as required for the decoder system. B. Wire between the decoders and the solenoid valves shall be Single Conductor Wire for direct burial applications, meeting UL Standard 493, UF-14/1 for "control wiring" which is typically red in color and UF-14/1 for "common wiring which is typically white in color. C. Wire Connectors for solenoid wires shall be Rainbird DB Series or prior approved equal. 2.9 ENVIRONMENT CONDITION SENSORS Cherokee Springs Plaza Underground Sprinkler System

7 A. Rain Sensor - Equal to Mini-Clik II manufactured by Glen-Hilton Products, Inc. B. Freeze Sensor - Equal to Freeze-Clik manufactured by Glen-Hilton Products, Inc THRUST BLOCKS A. Thrust blocks shall be composed of concrete aggregates meeting ASTM Specification C- 33 and Portland Cement meeting ASTM Specification C-175. Mix shall be no leaner than 1 part cement, 2-1/2 parts sand and 4-1/2 parts washed gravel, having a minimum compressive strength of 2000 PSI. PART 3 - EXECUTION 3.1 PREPARATION A. Design system to provide coverage of turf and planting beds on separate zones. Route piping to avoid plants and structures. All planting beds with sun exposure shall be zoned separately from shaded planting bed areas. All planting beds with shrubs and perennial plantings shall be zoned separately from beds with annual or seasonal planting. Turf rotor heads to be zoned separately from turf spray heads. B. Piping within driplines of existing trees will be located to minimize damage to trees. Location of piping within driplines of existing trees to be flagged and approved by Owner s Representative prior to installation. 3.2 IRRIGATION DESIGN A. Spray heads shall be spaced no further than for "Head to Head" coverage based on the sprinkler head performance published by the head manufacturer. Rotary heads (3/4" inlet) shall be spaced no further than 85 percent of the published radius for the design pressure. B. Valves shall be sized according to the flow through the valve as follows: 3-18 GPM - 1" Valve GPM - 11/2" Valve GPM - 2" Valve C. All components of the irrigation system are to be designed and specified to maintain the design pressure and performance at the sprinkler heads with a fluctuation of static water pressure of plus or minus ten percent. D. Pressurized main line pipe shall have maximum velocities of five (5) feet per second. E. Lateral line pipe shall have maximum water velocities of five (5) feet per second. F. The maximum pressure differential between the sprinkler head nearest the control valve and the sprinkler head furthest from the control valve shall not exceed 10 percent of the pressure at the control valve. G. Review layout requirements with other affected work. Location of heads to be coordinated with planting bed and lawn edges. Verify location and installation of sleeves (under paving and other improvements) to accommodate system. H. Protect landscaping and other features remaining as final work. 3.3 TRENCHING Cherokee Springs Plaza Underground Sprinkler System

8 A. Trench for sprinkler system to provide proper grades and slopes to drain points. B. Keep trenches free of debris, material or other obstructions that may damage pipe. 3.4 INSTALLATION A. Install sleeves under paving and other improvements prior to construction. Install where required to accommodate piping at proper depth to prevent damage by other construction activities and to provide specified burial depth for irrigation pipe. Location of sleeves to be recorded and marked. B. Install pipe, valves, controls and sprinklers in accordance with manufacturer's instructions. Connect to water and electrical service. All work to be accomplished in accordance with applicable codes. C. All main line piping to be installed with a minimum of 18 inches cover and lateral piping with 12 inches minimum cover. D. Bed pipe on solid base free from rocks and other deleterious materials. E. Set sprinkler heads and valve box covers at finish grade. Valve boxes shall be placed in groundcover areas where possible. Rectangular valve boxes to be placed parallel to nearby curbs and walks or other improvements. F. Provide for thermal movement. G. Install automatic drain valves at all low sections of lateral piping (lines downstream from valves) to insure complete drainage of system when not in use. Wrap each valve with approved filter fabric. H. Install manual drain valves at all low sections of mainline (upstream lines) piping to permit complete drainage of system when not in use. Provide 12-inch depth gravel sump below each valve. I. Install all heads on approved swing-joints or nipple connections. J. Install control wiring. 1. Verify that the work of this section is installed in strict accordance with the latest edition of the National Electric Code and local electrical codes. 2. Install neutral and control wires, 12 inches below finish grade, in the same trenches as the main and lateral lines. The wires shall be installed in a neat and orderly fashion and bundled together and taped every 10 feet. Snake wires in trench to allow for expansion and contraction and provide slack loops at every splice, change of direction, at the valves, where the wire enters the conduit for the automatic controller and at least every 100 feet in runs more than 100 feet in length. The slack loops shall be created by wrapping 3 feet of wire around a 1/2 inch diameter pipe to form a coil. 3. Solder or join all wire connections by positive mechanical connectors. Splices must be properly insulated and waterproofed. Control wire splices will be allowed only in runs more than 500 feet and only in valve boxes. 4. Provide grounding at each decoder per manufacturer s recommendations. K. After piping is installed, before sprinkler heads are installed and backfilling commences, open valves and flush system with full head of water. L. Backfill trench and compact to finish grade elevation. Fill material placed within 12 inch of pipe to contain no rock or gravel particles greater than 1/2 inch in diameter. Protect piping Cherokee Springs Plaza Underground Sprinkler System

9 from displacement. All settlement after backfill to be repaired. M. Arrange and coordinate installation of water meter. Cost paid by Contractor. N. Provide concrete thrust blocks at changes in direction (at ells and tees) of mains and at termination of mains. One cubic foot minimum. Size of blocks and location to be in strict accordance with pipe manufacturer's specifications. Size shall be adequate and so placed to take all thrust created by maximum internal water pressure. O. Set valve box covers level at finish grade. Rectangular valve boxes to be placed parallel to nearby curbs and walks or other improvements. Valves and valve boxes shall be installed where shown or directed, and shall be set plumb. Valve boxes shall be centered on the valves. Where feasible, valves shall be located outside the area of natural walkways or paths and shall be placed in groundcover areas where possible. Earth fill shall be carefully tamped around each valve box. Valve boxes should be supported or blocked such that any surface loads on the valve boxes will not be transmitted below to the pipe or valves. Washed gravel sumps shall be provided below all valve boxes to permit drainage of water away from valves. Minimum depth of gravel sump is 8 inches. P. Install at least two (2) automatic drain valves per zone at all low points sections of lateral piping (lines downstream from valves) to insure complete drainage of system when not in use. Q. All sprinklers shall be installed on flexible connections or swing joints as specified in Section 2.02 "Pipe and Fitting Materials" and shall be set plumb and level with the final turf grade. R. All trenches shall be carefully backfilled with the excavated materials approved for backfilling, consisting of earth, loam, sandy clay, sand, soft shale, or other approved materials, free from large clods of earth or stone. Rock, broken concrete or pavement, and large boulders shall not be used as backfill material. The backfill shall be thoroughly compacted and evened off with the adjacent soil level. Selected fill dirt or sand shall be used if soil conditions are as discussed above. The fill dirt or sand shall be used in filling four (4) inches above the pipe. The remainder of the backfill shall contain no lumps or rocks larger than one (1) inch. The top six (6) inches of backfill shall be free of rocks or gravel particles over one-half (1/2) inch in diameter, subsoil or trash. Open trenches or partially backfilled trenches shall be kept to a minimum and effort shall be made to completely backfill that trench opened each day. The Contractor will be responsible for restoration of all settlement for a period of one year from acceptance. S. The irrigation controller shall be mounted inside the specified cabinet securely, level and plumb at the specified location shown on the contract drawings according to manufacturer's recommendations. Electrical conduit PVC sweep ells shall be used for the entering and exiting of the 24 volt control wires into the conduit entering the controller. Controllers shall be connected to the appropriate valves as indicated on the contract drawings. Electrical power supply to the controller shall be installed according to local electrical codes and shall be provided by contractor. Provide grounding per manufacturer s recommendations. T. Rain and freeze sensors shall be installed according to manufacturer s recommendations and shall be installed at locations approved by Owner. U. Clean area and remove all debris and excess materials from site. V. Install pre-fabricated enclosure over backflow preventer. Place on 4 thick concrete pad sized to accommodate attachment per manufacturer s requirements. Provide electrical connection and install heater or heat cable. Cherokee Springs Plaza Underground Sprinkler System

10 3.5 TESTS A. Static Pressure Test 1. The entire main line system shall be constructed to successfully withstand, when completed, a full static pressure or 100 psi (whichever is greater) for a period of 6 hours with no resulting flow or pressure loss. 2. The testing for leakage shall be conducted with the observation of the Owner and all pipe, joints and appurtenances will be inspected while the system is under test pressure and leaks corrected as directed. The testing shall extend over a period of up to six (6) hours to allow for a complete inspection. B. Performance Test 1. Upon completion of the irrigation system installation including all pressure tests, Contractor shall conduct a performance test of the complete system to ensure that all components are functioning properly. Performance test shall consist of operating the system through a complete irrigation cycle per day for two (2) consecutive days. Contractor shall be at the site to monitor the performance tests and make any adjustments and corrections as needed during the testing period. 2. The Contractor shall balance and adjust the various components of the system so that overall operation of the system is most efficient. This includes adjustments to pressure regulators, part-circle sprinkler heads and individual station adjustments on the controllers. 3. Repair grades and re-dress mulch in planted areas disturbed by final testing and adjustment. END OF SECTION Cherokee Springs Plaza Underground Sprinkler System