| System 1 (pre-qualified) | Carbon steel with maximum operating temperature < 120°C (248°F) Structural steel Exteriors of equipment, vessels, piping and valves (not insulated) |
| System 2 | Carbon steel surfaces exposed to operating temperatures > 120°C (248°F) |
| System 3A-3G (System 3B pre-qualified) | Internal surface of carbon steel tanks |
| System 4 (pre-qualified) | Walkways, escape routes and lay down areas |
| System 5A (pre-qualified) | Epoxy-based fire protection |
| System 5B (pre-qualified) | Cement-based fire protection |
| System 6A | Uninsulated stainless steel when painting is required. Aluminum when painting is required |
| System 6B | Hot-dipped, galvanized steel when painting is required |
| System 6C | Insulated stainless steel piping and vessels at temperatures < 150°C (302°F) |
| System 7A (pre-qualified) | Carbon and stainless steel in the splash zone |
| System 7B (pre-qualified) | Submerged carbon and stainless steel ≤ 50°C (122°F) |
| System 7C (pre-qualified) | Submerged carbon and stainless steel > 50°C (122°F) |
| System 8a |
Structural carbon steel with maximum operating temperature ≤ 80°C (176°F) in internal and fully dry and ventilated areas |
| System 8b |
Structural carbon steel with maximum operating temperature ≤ 80°C (176°F) in fully dry and ventilated areas |
| System 9 | Bulk-supplied carbon steel valves with maximum operating temperature up to 150°C (302°F) |
NORSOK Approved Paints
Download the manufacturer specifications for NORSOK M-501 certified systems below:
Carboline | Hempel | International Paints | Jotun | PPG | Sherwin Williams
Guide To Working In Confined Spaces