NORSOK M-501 Standard

For carbon steel operating below 120°C. This covers structural steel, exteriors of equipment, vessels, piping and valves (un-insulated)

For the internal surface of carbon steel tanks

For use under fire protection

For carbon & stainless steel submerged or in the splash zone

For bulk supplied carbon steel valves operating up to 150°C

For carbon steel operating above 120 °C. This covers insulated surfaces, vessels, piping, flare and crane booms

For walkways, escape routes and lay down areas

For un-insulated stainless steel, aluminium, galvanised steel and insulated stainless steel piping or vessels operating below 120°C

For structural carbon steel with operating temperature below 80°C in fully dry and ventilated areas

Full details of the NORSOK M-501 can be read here