The standard strictly states that "equivalent" standards (like a modified API 6D) are not automatically acceptable. Unless a deviation is formally approved by the operator, the exact NORSOK L002 requirement applies.
Minimum allowable distances between pipes, structural steel, and electrical cable trays to prevent clashing and galvanic corrosion. norsok l002 pdf
Does not apply to risers, subsea pipework, sanitary systems, or land-based plants. Core Technical Requirements norsok l002 pdf
Always download the latest PDF and then check a "Change Log" at the front of the document to see if your specific design case has been altered. norsok l002 pdf