- Tong-il Boiler & Industries Co., Ltd. (TBI) and the following companies have agreements for cooperated production and engineering
- 1. National Oilwell Varco (Norway) - Vessels of Bulk Handling / Mud System, Top Side Structure
- 2. Aker Solutions ASA (Step offshore AS) - Vessels of Bulk Handling / Mud System, Top Side Structure
- 3. Rolls-Royce - Tank, Vessels, Rollers, Stabilizers, Container and etc
- 4. Nippon Steel Corporation - Dust Catcher, Duct, Heavy Structure and etc
