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SK Innovation is the parent company of SK Energy, which operates two refineries, one in Incheon and another in Ulsan.
The restart dates of the 40,000 barrels per day (bpd) RHDS -- a unit which processes feedstock from a crude unit for gasoline-making unit residue fluid catalytic cracker (RFCC) -- was not immediately clear, she said.
One of SK Energy's RFCC, a 57,000 bpd unit, is currently under maintenance since late May. The unit is to restart in mid-July.