Rack Phase Difference

The difference in elevations between the chords of any one leg.

Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global Standards

Rack Phase Difference

Relative difference in the position of adjacent leg chords within a leg measured parallel to the longitudinal axis of the chords. NOTE This is the out-of-plane distortion of the plan-frame.

Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards

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