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This Manual of Practice addresses the design of major pipeline or duct segments to be installed by horizontal directional drilling (HDD). HDD is a trenchless This Manual of Practice addresses the design of major pipeline or duct segments to be installed by horizontal directional drilling (HDD). HDD is a trenchless HDD pilot hole operations are not unlike those involved in drilling a directional oil well. Drill pipe and downhole tools are generally interchangeable and Under Obstacles, Including River Crossings,” and in the ASCE. Manual of Practice 108, “Pipeline Design for Installation by. Directional Drilling.” standardisation in design and procedures and to provide guidance to ensure construction (horizontal directional drilling, micro tunnelling and auger or