NDT of pressure vessel, steel equipment, piping, and steel structure
- Unimit Engineering Public Co., Ltd.
- Patkol Manufacturing Co., Ltd.
- Thai Metal Product Industrial Co., Ltd.
- Toyo-Thai Corporation Ltd.
- Cryotech Co., Ltd.
- PSA Chemtech Co., Ltd.
- Best Tech and Engineering Corporation
- German-Thai Boiler Engineering Corporation
- Foster Wheeler Service (Thailand) Limited
- Nawarat Pattanakarn Public Co., Ltd.
- S.Siriseang Co., Ltd.
- Experteam Co., Ltd.
- STP&I Public Co., Ltd.
- Thai Takenaka International Co., Ltd.
- Scan-Inter Public Co., Ltd.
- Christiani & Nielsen (Thai) Public Co., Ltd.