Otamerica, New Crude Oil Exports Jetty

Oiltanking Ebytem executed an engineering, procurement, and construction (EPC) contract. The jetty’s structures consist of large concrete pilecaps supported by 1 to 1.2 m dia. drilled shafts installed in silty sands. SGH peer reviewed the design for the jetty, featuring:

• A 1.8 km long access trestle connected to a double berth pier, forming an “L” in plan
• The trestle constructed with an array of 36 m long pipe galleries supported on pile bents
• An arrangement of strategically placed breasting and mooring dolphins, a service platform, and a loading platform, interconnected with walkways
• Support and conveyance for 2 to 20 in. dia. pipelines
• A loading platform with two marine loading arms on each side

SGH also provided engineering support during construction, which was challenged by:

• Silty sands that required pile driving analysis and crosshole sonic logging testing during the installation of drilled shafts and accomplished with two jacking platforms deployed to the site
• Staged construction related to placing large precast reinforced concrete elements and marine fluctuations due to the open sea exposure and semidiurnal tidal cycles