Tunnel allows landfall approach for Troll pipeline

Journal Article · Mon Dec 04 00:00:00 EST 1995 · Oil and Gas Journal

OSTI ID:136985

Hove, F ^[1]; Kuhlmann, H ^[2]

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1. Reinertsen Engineering ANS, Trondheim (Norway)
2. A/S Norske Shell, Trondheim (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 1 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, and prefabricated 450 metric ton riser bundles installed in the vertical tunnel piercing shafts. The paper describes the seabed route, the tie-in design approach, and construction on the seabed and underground. First gas is scheduled to flow in April, 1996.

• OSTI ID: 136985
• Journal Information: Oil and Gas Journal, Vol. 93, Issue 49; Other Information: PBD: 4 Dec 1995
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
NORWAY
PIPELINES
CONSTRUCTION
TUNNELS
OFFSHORE SITES
NATURAL GAS
TRANSPORT
ROUTING
EQUIPMENT INTERFACES