Bontang LNG Plant Operational Strategy to Manage Ethane Refrigerant Inventory during Low NGL Extraction

摘要

Badak LNG experience declining feed gas flowrate and shifting gas composition into lower NGL content. As consequence, times required for bullet replenishment has become approximately 50 times slower and potentially cause start up delay due to lack of refrigerant for make-up. In other hand, during very low ethane rundown from process train, significant amount boil off gas (BOG) generated along the pipelines which lead to excessive ethane loss to fuel gas and lower ethane liquid accumulated in storage bullet. As mitigation one bullet was reactivated to buffer sufficient amount of inventory and bullet operating pressure is raised to expedite replenishment time during very low NGL extraction.