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, ...

Why Register?

Non-subscribers can only view whitepapers by providing name, home and email address, phone number and other information and comment on/rate articles.

Why Subscribe?

Oil & Gas Journal subscribers with login credentials can access these premium features of OGJ Online:

  • Current Issue – an html version of the current week's issue of Oil & Gas Journal.
  • Past Issues – An Electronic OGJ Archive. A keyword-searchable archive of all issues of Oil & Gas Journal dating back to 1990; also searchable by issue date.
  • Market Journal – a weekly round-up of the oil and gas markets, with observations from leading analysts.
  • Editor's Perspective – a short article of insight and opinion by the Editor of Oil & Gas Journal.
  • OGJ Industry Stats – quick access to current industry statistics from Oil & Gas Journal.
  • OGJ Survey Downloads - quick access to exclusive reports from Oil & Gas Journal.


Subscriber Help or Subscribe

Oil & Gas Journal Subscribers: Have your subscription number (from the mailing label on the cover of your Oil & Gas Journal) and e-mail address ready to set up your online account through Customer Service Assistant.

If you're not an Oil & Gas Journal subscriber, start a subscription and gain access to the subscriber areas of OGJ Online now.

Stay Connected