The BP Indonesia operates Tangguh gas field in Berau Bay in the province of Irian Jaya, Indonesia. The natural gas field contains over 500 billion m³ (17 Tcf) of proven natural gas reserves, with estimates of potential reserves reaching over 800 billion m³ (28 Tcf).

Saipem as the main contractor for the project subcontracted Gunanusa to fabricate two Gas Production Facilities (GPF) platforms (VR-A and VR-B), each deck weight is 1200 tonnes, including each jacket (1900 tonnes) and pile (1300 tonnes).

The BP Tangguh facilities have a 40 years long term corrosion protection, which was accomplished by using Thermally Spray Aluminum (TSA) on the structures

The project was completed in October, 2006.