Oil and Mining
Chevron Pacific Indonesia (Caltex), Chevron Indonesia Company (Unocal), Total E & P Indonesie, Pertamina (Region Sumatra, Jawa & KTI ), Conocophillips Indonesia, Elnusa Tristar (Ramba) , Energy Equity, Pertamina-Talisman (Tanjung and Ogan Komering), Medco, Vico, CNOOC, Santos (Sampang) Ltd., BP West Java, Golden Spike, Petrochina International, Chevron Geothermal Salak, EMP Kangean, Kondur Petroleum S.A, Star Energy.

Industries
PT. Indoalumunium, PT. Indah Kiat, Tbk., Pusri, PT. Kalimantan Pacific Industri, PT. Kalimantan Pacific Amonia, Petrokimia Gresik, Kelian, Semen Padang, Tripolyta , Styrindo Mono Indonesia, Indo Bharat Rayon, Polytama Propindo, Pupuk Kalimantan Timur, Kaltim Pharna Industri, Imeco Inter Sarana , Sayap Mas Utama, Universal Respati Turbine Engineering.

Reputable Contractors
PT. Rekayasa Industri, Siemens Indonesia, Guna Nusa, PT. IKPT, HESS, PT. TRIPATRA, PT. Krakatau Engineering, Rotary Engineering (Singapore).