In all cases the product should be installed to the alignment and elevations shown on the drawings within prespecified tolerances. However, tolerance values are application-dependent. For example, in a major river crossing a tolerance of 12 feet from the exit location along the drill-path centerline may be an acceptable value. However, this tolerance is not acceptable when installing a product line between manholes. Similarly, grade requirements for water force mains are significantly different than those on a gravity sewer project. It is advisable to establish tolerance limits for various applications that are acceptable from the design point of view and at the same time achievable using current tracking and steering capabilities of HDD equipment.
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