Compliance with emission legislation especially pertaining to NOx was ensured
primarily through excess air control using an actuated stack damper. New stacks were also fitted to both furnaces.
PROJECTS, ENGINEERING & CONSULTANCY
The St. Fergus Gas Terminal (SFGT) processes natural gas extracted from the UK and Norwegian Continental shelves via the FUKA and Vesterled pipelines respectively. The FUKA Pipeline gas is processed through the Phase 3 facilities at the terminal whilst the Vesterled pipeline gas is processed via the Phase 2 facilities.
The Phase 3 gas processing facilities use hot oil as the heating medium to provide continuous heating for the process and utility heat exchangers. The hot oil is heated using fuel gas in 2-off natural draft API 560 type furnaces each with a design duty of 14MMkcal/hr – issues pertaining to the safety and reliability of the Phase 3 furnaces (F-901 and F-902) were identified following HAZOP and SIL reviews.
A Furnace Upgrade Project was sanctioned to reduce the risks associated with the start- up, normal operation and shutdown of the furnaces to bring them to ALARP (as low as reasonably practical) status.
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