Definition(s)
Primary marking
Primary marking is defined as marking of major structural members and systems that need to be identified for operational, installation, and retrieval purpose.
Source: API Recommended Practice 17H, Remotely Operated Tools and Interfaces on Subsea Production Systems, Second Edition, June 2013 (Addendum 1, October 2014). Global Standards
Primary marking
Primary marking is defined as the marking of major structural members and systems that need to be identified for operational, installation and retrieval purposes. Recommended character height for marking of symbols is 170 mm (6,693 in) to 500 mm (19,685 in).
Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global Standards