- ALSTOM John Thompson Boilers
- Applied Thermo
- Armstrong Steam
- BCL Ltd
- Bessie Global Management Practice
- CARAB Technologies
- Combustion Technology
- Court Fabrics
- COVEC
- ESKOM
- SANS
- SAPPI
- SiVEST
- TFD
- Thermal Energy Systems
- Tiger Brands Langeberg
- Combustion Technology
- Court Fabrics
- COVEC
- ESKOM
- Exxaro
- IDC
- Kelvin Power Station
- Middelburg Ferrochrome
- MITTAL
- TUV
- York Timbers
- PAITON
- Palabora Mining Company
- PARMALAT
- Pioneer Foods
- PRO-TEC
