1、Standard Practice for Solid Wall High-Density Polyethylene (HDPE) Conduit for Non-Pressure Applications Used for the Protection of Power and Telecommunications Cables AASHTO Designation: R 63-13 American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 2
2、49 Washington, D.C. 20001 TS-4b R 63-1 AASHTO Standard Practice for Solid Wall High-Density Polyethylene (HDPE) Conduit for Non-Pressure Applications Used for the Protection of Power and Telecommunications Cables AASHTO Designation: R 63-13 1. SCOPE 1.1. This standard practice provides guidance to e
3、ngineers in the specification of HDPE conduit used in buried applications for the protection of power cables for use in highways, airport lighting, traffic control, and fiber optic data and command and control applications in State Transportation Projects. This standard practice covers conduit used
4、in the following manner: HDPE pipe used as a casing for the protection of smaller individual conduits, innerducts, in road crossings; HDPE conduit in coils, on steel reels, or in straight sticks; and CIC (cable in conduit), when power cable (conductors), CATV (coaxial), or fiber optic cable is insta
5、lled in the conduit at the conduit manufacturing facility. HDPE pipe is commonly installed in standalone duct installations for the protection of power cable (conductors), CATV (coaxial cable), or fiber optic cable. HDPE pipe is commonly installed in standalone duct applications for road crossings w
6、hen the bury depth is sufficient to avoid degradation effects to the road. HDPE pipe is commonly installed in standalone duct applications parallel to the roadway. 1.2. This standard practice covers material, dimensional, workmanship, and performance requirements for use of conduit in non-pressure a
7、pplications. 1.3. HDPE conduit meeting the guidelines of this standard practice shall be outside diameter (OD)-controlled solid wall, with or without external or internal ribs. The sizing shall be Iron Pipe Size or Schedule as noted in Tables 6 and 7. The internal or external surface may contain a c
8、oextruded layer provided the finished conduit meets the product requirement in this standard. 1.4. This standard practice does not include guidelines for installation of HDPE conduit. Typical installation methods include trenching, plowing, and Horizontal Directional Drilling (HDD). Consult the PPI
9、(Plastic Pipe Institute) Handbook of Polyethylene Pipe and TN (Technical Notes) on the PPI website, http:/plasticpipe.org, for further information and guidance on installation methods. 2. REFERENCED DOCUMENTS 2.1. ASTM Standards: D570, Standard Test Method for Water Absorption of Plastics 2015 by th
10、e American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4b R 63-2 AASHTO D618, Standard Practice for Conditioning Plastics for Testing D638, Standard Test Method for Tensile Properties of Plastics D790, Standard Test M
11、ethods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials D792, Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement D1238, Standard Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plasto
12、meter D1505, Standard Test Method for Density of Plastics by the Density-Gradient Technique D1600, Standard Terminology for Abbreviated Terms Relating to Plastics D1603, Standard Test Method for Carbon Black Content in Olefin Plastics D1693, Standard Test Method for Environmental Stress-Cracking of
13、Ethylene Plastics D2122, Standard Test Method for Determining Dimensions of Thermoplastic Pipe and Fittings D2239, Standard Specification for Polyethylene (PE) Plastic Pipe (SIDR-PR) Based on Controlled Inside Diameter D2412, Standard Test Method for Determination of External Loading Characteristics
14、 of Plastic Pipe by Parallel-Plate Loading D2444, Standard Test Method for Determination of the Impact Resistance of Thermoplastic Pipe and Fittings by Means of a Tup (Falling Weight) D2839, Standard Practice for Use of a Melt Index Strand for Determining Density of Polyethylene D3350, Standard Spec
15、ification for Polyethylene Plastics Pipe and Fittings Materials D3485-02, Standard Specification for Smooth-Wall Coilable Polyethylene (PE) Conduit (Duct) for Preassembled Wire and Cable (Withdrawn 2011) D4703, Standard Practice for Compression Molding Thermoplastic Materials into Test Specimens, Pl
16、aques, or Sheets D4883, Standard Test Method for Density of Polyethylene by the Ultrasound Technique D6070, Standard Test Methods for Physical Properties of Smooth-Wall, Coilable, Polyethylene (PE) Conduit (Duct) for Preassembled Wire and Cable F412, Standard Terminology Relating to Plastic Piping S
17、ystems F1804, Standard Practice for Determining Allowable Tensile Load for Polyethylene (PE) Gas Pipe During Pull-In Installation F1962, Standard Guide for Use of Maxi-Horizontal Directional Drilling for Placement of Polyethylene Pipe or Conduit Under Obstacles, Including River Crossings F2160, Stan
18、dard Specification for Solid Wall High Density Polyethylene (HDPE) Conduit Based on Controlled Outside Diameter (OD) 2.2. National Electrical Manufacturers Association (NEMA) Standard: NEMA TC 7, Smooth-Wall Coilable Electrical Polyethylene Conduit 2.3. Underwriters Laboratories (UL) Standards: UL 6
19、51A, High Density Polyethylene HDPE Conduit Note 1In November of 2011, UL changed the specification numbers (no changes in the body of the specifications). Prior to November 2011, UL 651A was PVC and HDPE in stick form and UL 651B was HDPE in coiled form. As of November 2011, UL 651 now addresses PV
20、C in stick-form conduit and UL 651A addresses HDPE in stick-form and coiled-form conduit. UL 1990, Nonmetallic Underground Conduit with Conductors 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4b R
21、63-3 AASHTO 2.4. National Fire Protection Association (NFPA 70); National Electric Code: NFPA 70; National Electric Code (NEC), 2011: i. Article 353: High Density Polyethylene Conduit; Type HDPE Conduit ii. Article 354: Nonmetallic Underground Conduit with Conductors: Type NUCC 3. TERMINOLOGY 3.1. D
22、efinitionsGeneral terms used in this standard are as defined in ASTM F412, ASTM F2160, UL 651A, and NEMA TC 7. Abbreviations are in accordance with ASTM D1600, unless otherwise specified. 3.2. Definitions of Terms Specific to This Standard: 3.2.1. CATV and CCTV, ncable television and closed circuit
23、television 3.2.2. cell classification (cell class), nmethod of identifying thermoplastic materials such as HDPE, as specified in ASTM D3350, where the cell classification is based on six properties for PE. 3.2.3. CIC (cable in conduit), nwhen the power or fiber cable is installed during the extrusio
24、n process of the HDPE conduit. 3.2.4. conduit (duct), na tubular raceway for carrying power, communications, or other wires and cable. 3.2.5. EPEC A, nElectrical Polyethylene Conduit A. This type represents the nominal dimensions as specified in standard dimension ratio (SDR) 17. 3.2.6. EPEC B, nEle
25、ctrical Polyethylene Conduit B. This type represents the nominal dimensions as specified in SDR 13.5. 3.2.7. ESCR, nenvironmental stress crack resistance. Also termed as “Slow Crack Growth Resistance.” 3.2.8. FTTH, nfiber to the home. 3.2.9. HDD, nhorizontal directional drilling. 3.2.10. innerduct,
26、na conduit installed inside a conduit. 3.2.11. IPS (Iron Pipe Size), nIron Pipe Size convention for PE pipe. Based on OD-controlled pipe-SDR nomenclature. 3.2.12. ITS, nIntelligent Transportation Systems. 3.2.13. ovality, na conduits deviation from roundness as a consequence of coiling, handling, or
27、 installation. 3.2.14. NEC, nNational Electric Code. 3.2.15. Schedule 40/80, nThis type represents the nominal dimensions as specified in ASTM F2160, UL 651A, and NEMA TC 7 (EPEC-40, EPEC-80). 3.2.16. ribs, na series of ridges, longitudinal or spiral, along the inside or outside surface of a conduit
28、. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4b R 63-4 AASHTO 3.2.17. SCADA, nSupervisory Control and Data Acquisition systems. 3.2.18. SDR (standard dimension ratio), nthe ratio of the average O
29、D divided by the minimum wall thickness. 3.2.19. SIDR, na sizing system that denotes an inside diameter (ID)-controlled conduit. SIDR sizing is noted in ASTM D2239. Note 2This is a pressure pipe specification, and in this standard, ONLY the dimensions of the conduit are to be used. Tables 1 and 2 in
30、 ASTM D2239 list conduit dimensions. 3.2.20. trade size, nthe nominal diameter of the conduit (pipe). Refer to the particular specification for dimensions and tolerances. 3.2.21. true size, ndenotes the use of a sizing system that requires a nominal inside diameter to be equal to or greater than the
31、 stated nominal size of the conduit (that is, a 11/4-in. conduit has a minimum ID of 1.25). 4. SIGNIFICANCE AND USE 4.1. SignificanceHigh-Density Polyethylene (HDPE) conduit is a protective pathway for telecommunications and power cables used throughout the infrastructure. The inherent properties of
32、 HDPE such as chemical resistance and stress crack resistance are well suited for infrastructure systems, as these require long service life. Because of HDPE coilable conduits long lengths, flexibility, and tensile strength, it is ideally suited for HDD (horizontal directional drilling) installation
33、 methodologies and construction by plowing along highway rights-of-way. HDPE “sticks” (20- to 40-ft lengths) are used for larger sizes ranging from 6 to 12 in. and sometimes larger when the installation requires multiple pathways (innerducts) to run through one service pathway. 4.2. UseThe following
34、 lists the different areas for each segment, but use is not limited to the list: 1. Telecommunicationsfiber optics, CATV, CCTV or FTTH, along highway rights-of-way, Intelligent Transportation Systems (ITS). 2. Data AcquisitionSCADA (Supervisory Control and Data Acquisition) Systems for Positive Trai
35、n Control Technology, pipeline control, weigh stations and SMART bridges (structural monitoring), Intelligent Highway Systems (ITS), traffic control and highway monitoring systems, road condition sensors, and security. 3. Power Systemselectrical cables rated for 600V to 69kV (distribution and transm
36、ission lines), highway lighting systems, Intelligent Transportation Systems (ITS), traffic control and highway monitoring systems, and airport lighting systems. Note 3Power conductors rated at 90C and medium voltage cable rated at 105C are permitted for use with HDPE conduit. Per NEC Code 2011, Arti
37、cle 353, conductors or cable rated at higher temperatures are permitted, provided they do not operate at a higher temperature than the rating for HDPE conduit. 4. InstallationHDD, plowing and open cut; underground either direct buried or concrete encased, new installations, existing installations, a
38、nd additions/alterations. 5. HDPE (HIGH-DENSITY POLYETHYLENE) CONDUIT REQUIREMENTS 5.1. Material Requirement (Resin)Each of the conduit standards outlined in this document uses the minimum HDPE resin specification for extruding the conduit. The HDPE resin compounds used in manufacturing HDPE conduit
39、 meets or exceeds the minimum cell classification. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4b R 63-5 AASHTO 1. For ASTM F2160 and D3485, and NEMA TC 7, the minimum cell classification requirem
40、ent is PE 334480C or E, providing all other material requirements are met in ASTM D3350, Table 1, as cited below. 2. For UL 651A and UL 1990, the minimum cell classification requirement is as follows: a. UL 651APE 336620C stick pipe as described in ASTM D3350, Table 2, as cited below. b. UL 651A or
41、UL 1990PE 334420C or E coilable pipe or CIC as described in ASTM D3350, Table 3, as cited below. Material properties are typically supplied by resin manufacturers, but it is the responsibility of the conduit manufacturers to ensure the resin is suitable for the intended use. Table 1Minimum Cell Clas
42、sification PE 334480C or E (ASTM F2160 and D3485 and NEMA TC 7) Cell Description ASTM Value 3 Density D1505 0.940 g/cm33 Melt Index D1238 96 h, using Condition B, 10% Igepal solution as described in ASTM F2160, Section 4.1.3.3 0 Not Pressure Rated N/A N/A C Carbon Black D3350 Condition C requires mi
43、nimum 2% carbon by weightto ensure storage 1 year E UV Stabilized Color D3350 Condition Eto ensure storage 1 year Table 2Minimum Cell Classification PE 336620C (UL 651A and UL 1990 Stick Pipe) Cell Description ASTM Value 3 Density D1505 0.940 g/cm33 Melt Index D1238 24 h, using Condition B, 100% Ige
44、pal solution as described in ASTM D3350 0 Not Pressure Rated N/A N/A C Carbon Black D3350 Condition C requires minimum 2% carbon by weightto ensure storage 1 year Table 3Minimum Cell Classification PE 334420C or E (UL 651A and UL 1990 Coilable pipe and CIC) Cell Description ASTM Value 3 Density D150
45、5 0.940 g/cm33 Melt Index D1238 24 h, using Condition B, 100% Igepal solution as described in ASTM D3350 0 Not Pressure Rated N/A N/A C Carbon Black D3350 Condition C requires minimum 2% carbon by weightto ensure storage 1 year E UV Stabilized Color D3350 Condition Eto ensure storage 1 year 5.2. Col
46、ors Used in Conduit Applications: 5.2.1. Color SelectionThe key colors for HDPE conduit applications are shown in Table 4. Other colors can be used for HDPE conduit applications and are available on request. When selecting a color for HDPE conduit, it is best to reserve those listed in Table 5 for p
47、iping applications, especially in regard to the color yellow. This will prevent confusion when 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4b R 63-6 AASHTO determining which utility is running thr
48、ough the conduit or pipe. The colors listed in Table 5 are the standardized color code recommended by the American Public Works Association (APWA). These colors are used in the pipe applications, other than conduit, throughout the infrastructure system. Table 4Colors for Conduit Applications ColoraA
49、pplications RED or Black with Red Stripe Electric Power lines, cables, conduit and lighting cables ORANGE or Black with Orange Stripe Communication, alarm or signal lines, cable or conduit aAdditional colors are available on request. Table 5APWA Recommended Uniform Color Code Color Applications YELLOW Gas, oil, steam, petroleum, or gaseous materials BLUE Potable water PURPLE Reclaimed water, irrigation, and slurry lines GREEN Sewers and drain lines 5.2.2. Methods to C
