SINGAPORE-BASED Hallin Marine has won a subsea construction project on the Lima platform off the coast of north west Java, the company has announced.

The company did not disclose the value of the contract, but said it centred on the installation of new control taps and a bypass for the main pipeline which supplies 60 per cent of Jakarta’s gas requirements.

Hallin will send its subsea operations vessel the Ullswater to provide full saturation-diving services to the project, using equipment built into the vessel, it said.

The Ullswater will also be equipped with a remotely operated submersible vehicle which will be used for underwater observation and process monitoring.

The Ullswater is fully equipped for wellhead servicing, inspection and construction diving as well as for remotely-operated vehicle support.

Also on site from the Hallin fleet will be the subsea operations vessel Carlisle which was recently mobilised for duty as a diving support vessel.

The Carlisle has a Hallin-designed-and-built modular System Acceptance Testing system permanently mounted on deck. The dynamic positioning class 2 vessel also boasts a four-point-mooring system and accommodation for 126 people.

Hallin work teams based on the two vessels will be performing removal of concrete coating on existing pipelines, pipeline integrity checks, spools installation, pre-commissioning assistance, installation of hot-taps at multiple locations and the fitting of underwater pipe-closure stopples.

Hallin chief executive John Payne said that Hallin had won the contract on the basis of its successful track record as an experienced offshore support service-provider and the company’s knowledge in managing this type of project scope in the region.

“Past Hallin operations have included riser installations in the Jangkar field, installation of rigid risers and flexible flowlines in the Belanak field and installation of subsea umbilicals in the Natuna gas field,” he said.

The company had allocated the Ullswater to work on the Natuna gas field, offshore Indonesia, in May, having signed a US$6 million contract with a major engineering procedure construction, installation and commissioning contractor.

The 30-day contract centred on an offshore construction campaign to support the laying of 4,200 metres of flexible pipelines and the installation of rigid risers at the Natuna platform, Hallin East Division managing director Rik Zwinkels said.

“The job scope includes provision of project management and engineering services, saturation diving services, pre-lay survey using Hallin’s C-ROV work-class remotely operated vehicle and the pre-commissioning of the pipelines,” he said.

The Natuna gas field is located about 1,100 kilometres north of Jakarta and has estimated recoverable reserves of around 46 trillion cubic feet.