North American Oil & Gas Pipelines

JUN 2018

North American Oil & Gas Pipelines covers the news shaping the business of oil and gas pipeline construction and maintenance in North America, including pipeline installation methods, integrity management innovations and managerial strategies.

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Page 33 of 43

34 North American Oil & Gas Pipelines | JUNE 2 018 Engineering Challenges Associated with Waterbody Crossings By Glenn Duyvestyn T renchless crossings inherently present a greater number of risks and installation challenges than traditional open-cut construction methods. This is especially true for waterbody crossings where a unique set of engineering challenges must be overcome for a successful trenchless installation. Waterbody installations can consist of rivers, creeks, wetlands, har- bors, shoreline crossings or combinations thereof. Historically, water- bodies were crossed using open-cut practices with minimal mitigation measures for sediment control and environmental impacts (see p. 36). In today's age, these types of construction practices are often not pre- ferred by regulators, legislators and/or public entities pushing for the use of trenchless methods to complete waterbody crossings. Each trenchless technology carries an inherent risk associated with its specific method of installation. Often, horizontal directional drilling (HDD) construction methods are viewed as the preferred method for crossing any and all waterbodies. However, blind application of HDD methods to a waterbody crossing with disregard to crossing-specific risks has led to major failures, signifi- cant project delays, higher construction costs and greater environmen- tal impacts. Managing Risks When a lack of appropriate information exists, crossing unknowns can manifest themselves into undocumented project risks. These risks can lead to a greater probability of encountering a differing site condi- tion during construction, construction delays, higher costs, damage to corporate image, shareholder implications, and can potentially lead to ultimate project failure. Going under Water

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