Definition(s)
Air Gap
To physically separate or isolate a system from other systems or networks (verb).
Extended Definition: The physical separation or isolation of a system from other systems or networks (noun).
Source: NICCS™ Portal Cybersecurity Lexicon, National Initiative for Cybersecurity Careers and Studies (https://niccs.us-cert.gov/glossary) as of 11 November 2015, Global Standards
Air Gap
The clearance between the highest water surface that occurs during the extreme metocean conditions and the underside of the cellar deck.
Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Air Gap
Clearance between the highest water or ice surface that occurs during the extreme environmental conditions and the lowest exposed part not designed to withstand wave or ice. impingement
Source: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Global Standards