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The digital twin being developed for Jansz-lo will allow for a long-term predictive maintenance and performance optimization strategy, reducing the need for intervention and lower operating costs.

Source: Aker Solutions train in the SCS 2.0 system.”

Building upon the Åsgard experience, the Aker Solutions and MAN Energy Solutions alliance aims to deliver a true well stream compression system boosting the liquid and gas mixture that arrive from subsea wells without the use of scrub- ber and pump. “This will further reduce the size, weight and cost and thus make the high capacity centrifugal subsea com- pression system even more attractive,” Nyborg said.

“The well stream system will include a ? ow conditioning unit, a subsea compressor with auxiliary systems, a cooler and associated controls and high voltage equipment. The need for a separate liquid pump, with its high voltage power supply, is removed as all liquid is routed through the compressor. There are tremendous savings in reducing the umbilical scope and high voltage power supply accordingly, in particular on long distance step outs at deep waters.”

The ? ow rates for Jansz-Io are up to three times those at Ås- gard, requiring three compressors operating in parallel from one scrubber in one train. Aker Solutions was not able to share details on the subsea footprint, but said the power requirement per train is three times the 11.5 MW Åsgard train. The Jansz-

Io compression station is located approximately 140 kilome- ters northwest of the onshore terminal at Barrow Island (the step out for Åsgard was around 40 kilometers).

Early execution of a technology quali? cation program for the water depth (1,400 meters) and increased design pressure (285 bar) has been ongoing since 2017.

Nyborg said the proven Åsgard technology is applied for

Jansz-Io but with added lessons learned from commissioning and feedback from operation to support further optimization,

JULY/aUGUST 2019 OFFSHORE ENGINEER 35