Key Learning Outcome: The participants will understand how the Pseudo Dry Gas technology facilitates long deep-water tiebacks made possible by seal-less pumps and qualified by using an integrated digital advisor
Pseudo Dry Gas technology is proposed as an alternative concept for transporting multiphase fluids (gas, condensate and water) for long deep-water subsea tieback developments while delivering significant reductions in Scope 1 and 2 emissions in excess of 90% by the mitigation of compression. The basis of the PDG system is to remove the liquid of the main pipeline using piggable liquid removal unit(s) coupled with new FA design techniques.
An Omnirise seal-less magnetic drive pump boosts the liquid phase in small separate pipeline changing the shape of the internal resistance curve of the tieback from a quadratic function to a linear function over the operational envelope, allowing the pipeline to operate like a “pseudo” dry gas system.
The current work involved the qualification of a 180bar rated PDG unit, the seal-less subsea pump and the supporting subsea control system for flow loop testing undertaken at National Engineering Laboratories, UK. This development program is supported by Operators inclusive of Petronas and Woodside in conjunction with the Net Zero Technology Center, bringing the technology to TRL8 (NASA). All testing data from the various systems was integrated into a digital advisor system allowing cooperation between all stakeholders and disciplines during qualification.