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AASHTO R 63

2013 Edition, January 1, 2013

Complete Document

Standard Practice for Solid Wall High-Density Polyethylene (HDPE) Conduit for Non-Pressure Applications Used for the Protection of Power and Telecommunications Cables

Includes all amendments and changes through Reapproval Notice , 2017


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Description / Abstract:

This standard practice provides guidance to engineers 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 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 installed 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 when 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.

This standard practice covers material, dimensional, workmanship, and performance requirements for use of conduit in non-pressure applications.

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 coextruded layer provided the finished conduit meets the product requirement in this standard.

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 (Plastic Pipe Institute) Handbook of Polyethylene Pipe and TN (Technical Notes) on the PPI website, http://plasticpipe.org/index.html, for further information and guidance on installation methods.