Some lifts have exposure that will be considered not acceptable for normal lifts, this could be exposure to persons, dangerous materials, chemicals, critical structure, pressurized pipes in live plants, wellhead or pipelines. The common for these are that the consequence of a failed lift is much larger than for instance, damage of the lifted object itself, or the immediate surroundings. These lifts are all in the category of high risk as per NORSOK standards and requires measures.
Lifting appliances and lifting operations in the category as listed above, shall be designed and planned so the probability and consequence are reduced. NORSOK R002 Annex K (informative) describes possible methods and applicable means.