Largest refiner in Asia might temporarily store the oil or ship it elsewhere if waiver is not granted.
Tariffs will go into effect along with U.S. tariffs beginning on Sept. 15.
Two U.S. shale producers have challenged an energy pipeline operator's proposed surcharge for the Trump administration's 25% tariff on imported steel, raising the stakes for pipeline builders facing higher construction costs.
The report by OPEC also said oil inventories in developed economies rose in June, suggesting a trend that could raise the group's concern over a possible oil glut.
Frontline and Golden Ocean will acquire 15% and 10% interests in the joint venture respectively, while commodity trader Trafigura will contribute its existing physical bunkering activities and own the remaining 75%.
Imports could have averaged as much as 360,000 bbl/d.