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Gas processing plant
Customer Success Story

Ormen Lange gas field

World's largest subsea transformer

The Ormen Lange gas field is located in the North Atlantic, 120 kilometers northwest of Kristiansund, where the depths vary between 800 and 1,100 meters. The reservoir is 3,000 meters below sea level, covering an area 40 km long and 8-10 km wide. The field does not feature any conventional offshore platforms. Instead, three subsea templates on the ocean floor are connected directly by two 30 inch, 120 km long pipelines to the onshore process terminal at Nyhamna.

Hitachi Energy supplied automation, electrification, large variable speed drive system, telecommunications and operator training systems. 

Hitachi Energy also delivered a subsea transformer for pilot testing for Ormen Lange. The special subsea transformer is designed for transformers up to 100 MVA filled with mineral oil. The subsea transformer pressure compensator is made by a double inner metallic bellow, made by SMO, and an outer bellow made by rubber. Hitachi Energy uses a two barriers design for the compensators that is qualified and tested for 30 years of operation. The transformer can be situated at depths down to 1,100 m.

Main data
Customer:  Shell
Site:  North Atlantic, Norway
Customer need:  Reliable power, aumation, safety and information management system
Scope :
Subsea transformers
- Rated power 20/20MVA
- Rated voltages no load 132/22.5 kv
- Insulation levle LI650-AC275-SI540 / LI170-AC70
Application:  Subsea
Customer benefits:  - Improve the flow of compressed natural gas through a 1,200 kilometer-longer pipeline to the United Kingdom.
- Provide reliable power to ensure the operation of the 2nd largest gas fields on the Norwegian continental shelf.
Commissioning year:  2014