Published by department of transportation
-2.08 IRRIGATION SUPPLY LINE
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- 20-2.08B(2) Copper Pipe Supply Line
- 20-2.08B(4) Drip Irrigation Tubing
- 20-2.08B(5) Plastic Pipe Supply Line
- 20-2.08C(2) Galvanized Steel Pipe Supply Line
- 20-2.08C(4) Plastic Pipe Supply Line
20-2.08 IRRIGATION SUPPLY LINE20-2.08A General20-2.08A(1) SummarySection 20-2.08 includes specifications for installing irrigation supply line. 20-2.08A(2) DefinitionsReserved 20-2.08A(3) SubmittalsSubmit a certificate of compliance for polyethylene pipe and plastic pipe supply line. 20-2.08A(4) Quality AssuranceSolvent cement must comply with local air quality management district provisions. 20-2.08B Materials20-2.08B(1) GeneralConcrete for thrust blocks must be produced from commercial-quality aggregates. The concrete must contain at least 295 pounds of cementitious material per cubic yard. 20-2.08B(2) Copper Pipe Supply LineCopper pipe must be Type K rigid pipe complying with ASTM B88. Fittings must be wrought copper or cast bronze either soldered or threaded. Solder must be 95 percent tin and 5 percent antimony. 20-2.08B(3) Galvanized Steel Pipe Supply LineGalvanized steel pipe supply line and couplings must be standard weight complying with ASTM A53, except that the zinc coating must not be less than 90 percent of the specified quantity. Except for couplings, the fittings must be galvanized malleable iron, banded and threaded, and comply with ANSI B16.3, Class 150. Joint compound must be nonhardening and noncorrosive. Do not use pipe thread sealant tape. 20-2.08B(4) Drip Irrigation TubingDrip irrigation tubing must be virgin polyethylene plastic complying with ASTM D2737. The drip irrigation tubing must be distribution tubing with preinstalled in-line emitters. If preinstalled in-line drip irrigation tubing is not shown, you may install emitters that match the distribution specifications shown. The emitters must be barbed or threaded-type outlet devices with dual silicone diaphragms. When tested under ASTM D2122, the wall thickness of polyethylene tubing must have the thickness shown in the following table:
The polyethylene tubing fittings must be leak-free, compression type and have female sockets with an internal barb to provide a positive pipe-to-fitting connection that will not separate at the designed pressure. 20-2.08B(5) Plastic Pipe Supply LinePlastic pipe supply line must be PVC pipe that is NSF approved. Schedule 40 plastic pipe supply line must comply with ASTM D1785. Class 315 plastic pipe supply line must comply with ASTM D2241. PVC gasketed bell joints must comply with ASTM D2672, ASTM D2241, ASTM D3139, and ASTM F477. For solvent-cemented type joints, the primer and solvent cement must be made by the same manufacturer. The primer color must contrast with the color of the pipe and fittings. Solvent-cemented fittings for schedule 40 plastic pipe supply line must be injection molded PVC, schedule 40, and comply with ASTM D2466. Solvent-cemented fittings for class 315 plastic pipe supply line must be injection molded PVC, schedule 80, and comply with ASTM D1784 and ASTM D2467. Fittings for a supply line placed in an irrigation conduit must be schedule 80. Fittings for a plastic pipe supply line larger than 4 inches must be ductile iron complying with section 20-2.13C(2)(b). If UV-resistant plastic pipe supply line is required, the pipe must be homogeneous, a uniform color, and manufactured of: 1. At least 80 percent vinyl chloride resin with UV stabilizers 2. Non-PVC resin modifiers and coloring ingredients 3. Coloring ingredients with UV stabilizers
20-2.08C Construction20-2.08C(1) GeneralCut pipe straight and true. After cutting, ream out the ends to the full inside diameter of the pipe. Prevent foreign material from entering the irrigation system during installation. Immediately before assembling, clean all pipes, valves, and fittings. Flush lines before attaching sprinklers, emitters, and other terminal fittings. Reuse water from waterline flushing for landscape irrigation if practicable. Pipe supply lines installed between the water meter and backflow preventer assembly must be installed at least 18 inches below finished grade measured to the top of the pipe. Where a connection is made to existing supply lines, belled and gasketed fittings or compression fittings may be used. Install a thrust block at each change in direction on the main supply line, terminus run, and at other locations shown. Where supply lines cross paved ditches more than 3 feet deep at their flow line, install galvanized steel pipe for the entire span of the ditch. 20-2.08C(2) Galvanized Steel Pipe Supply LineCoat male pipe threads on galvanized steel under the manufacturer's instructions. 20-2.08C(3) Drip Irrigation TubingInstall drip irrigation tubing on grade and under manufacturer's instructions. If preinstalled in-line drip irrigation tubing is not shown, install emitters under manufacturer's instructions. Install a flush valve and an air-relief valve if recommended by the drip valve assembly manufacturer.
For solvent-cemented type joints, apply primer and solvent-cement separately under the manufacturer's instructions. Wrap the male portion of each threaded plastic pipe fitting with at least 2 layers of pipe thread sealant tape. Install plastic pipe supply line mains with solvent-cemented type joints not less than 18 inches below finished grade measured to the top of the pipe. Install plastic pipe supply line laterals with solvent-cemented type joints not less than 12 inches below finished grade measured to the top of the pipe.
20-2.08D PaymentThe payment quantity for any type of supply line pipe or drip irrigation tubing is the length measured along the slope. Directory: esc esc -> Biblical Eschatology Presentation by: D. Paul Beck May 4, 2016 Ground Rules esc -> Mikael Håfstrӧm Screenplay by Miles Chapman and Arnell Jesko esc -> Escort affinity Program for Audi Club Members esc -> Preliminary entry form pistol esc -> Application form esc -> Request from Asian and Pacific Training Centre for Information and esc -> Constitution of the engineering student council university of maryland esc -> Subdisciplines of Earth Science Geology; study of the earth Download 6.74 Mb. Share with your friends:
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