Vessel, equipment, piping for maintenance and turnaround modification Vessel certification, quality inspection on construction
- Paper: Siam Kraft, Phoenix, Kimberly-Clark
- Sugar: Eastern Sugar, Buriram Sugar, Khon Kaen Sugar
- Cement: Siam Cement, Siam City Cement, Jalaprathan Cement
- Latex: Goodyear, Bridgestone, Safeskin, Thai Synthetic Rubber
- Food: Dairy Plus, Nestle, Dutchmill, Thainamthip, Sermsuk