TUNNEL ALLOWS LANDFALL APPROACH FOR TROLL PIPELINE

12/04/1995
Frode HoveReinertsen Engineering ANS Hans KuhlmannA/S Norske ShellTrondheim, Norway A 4-km landfall tunnel was constructed to provide an approach to the rugged Norwegian coast for 36 and 40-in. offshore pipelines in Troll Phase I development. The tunnel terminates in 165 m of water with three vertical shaft connections to the seabed. Construction consisted of two main elements: 180 Metric ton tie-in spools installed between the offshore pipelines and the piercing shafts Prefabricated 450 Metric ton riser bundles installed in the vertical tunnel piercing shafts. SEABED ROUTING Troll Phase I development (Norske Shell) consists of an offshore production platform in 303-m water, ...
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