hdd large diameter pipeline crossings of highways
TRANSCRIPT
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HDD Large Diameter Pipeline Crossings of HighwaysProtecting Everyone’s Assets
Chris Mills, PEMarc 9, 2018
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General Stakeholders on HDD Highway Crossings Owners (DOTs & pipeline companies) Traveling public Engineer Various agencies Contractor
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HDD Stakeholder Needs Pipeline companies
– Transfer product from point “A” to point “B”
DOTs– Keep highways operating safely for traveling public
Engineers– Identify risks of installing HDD at proposed location– Design HDD to be feasible, reduce risk– Make recommendations on how to mitigate identified risks
HDD Contractor– Follow best industry practices to complete HDD installation
while mitigating risks
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Engineering Considerations Is proposed HDD alignment feasible? What type subsurfaces will be encountered during
drill?– Complete geotechnical exploration with soil borings and
laboratory testing
Does site location allow for proper layout of workspaces and are they accessible?
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Engineering Identify risks and design HDD to reduce risks Inadvertent drilling fluid returns surfacing “Dry hole” from entry and exit point elevation
differential and cause hole stability issues
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