- General Knowledge
- Engineering
- Nuts & Bolts
- Materials
- P&ID Symbols
- Standards and Specifications
- API – American Petroleum Institute
- ASME – American Society Of Mechanical Engineers
- ASTM – American Society for Testing and Materials
- BSi – British Standards Institution
- IEC – International Electrotechnical Commission
- JIS – Japanese Industrial Standard
- MSS – Manufacturers Standardization Society
- NFPA – National Fire Protection Association
- AWS – American Welding Society
- Pipefitting
- Welding
- Rigging
- Iron Workers