Seibu Oil operates the Yamaguchi refinery, which is located in Yamaguchi, Japan. It is an integrated refinery owned by Idemitsu Kosan, Ube Industries, and others. The refinery, which started operations in 1962, has an NCI of 10.02.

Key processes of the refinery

Crude Distillation Unit (mbd): 120
Vacuum Distillation (mbd): 44
Catalytic Cracker (mbd): 28
Reformer (mbd): 49
Hydrotreater (mbd): 161
Isomerization (mbd): 7

The capacity of the refinery is expected to remain the same as mbd by 2030.

Maintenance activities at Yamaguchi refinery

The Yamaguchi refinery witnessed two incidents during the period 2015-2020.

About Seibu Oil

Seibu Oil is a privately-held petroleum refining company. The company offers various products including crude oil, liquefied petroleum gas (LPG), octane, propylene, gasoline, naphtha, jet fuel, as well as xylene, benzene, kerosene, gas oil, bunker fuel, and asphalt. It is also involved in the import and supply of petroleum products and petrochemicals. The company primarily operates in Japan, where it is headquartered in Tokyo.


Information on the refinery is sourced from GlobalData’s refinery database that provides detailed information on all active and upcoming, crude oil refineries and heavy oil upgraders globally. Not all companies mentioned in the article may be currently existing due to their merger or acquisition or business closure.

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