Before well repairing operation, it is often necessary to install the jack-up very close to the existing spudcan pits, which called footprints. The spudcan is prone to slide towards the footprint in this process, which can lead to damage of legs, jacking system and the hull structure. RPD (Rack Phase Difference) system can monitor the rack vertical phase difference of adjacent chord of truss type leg. In this paper, the RPD calculation principle is studied and an available analysis method of critical RPD applicable to spudcan sliding condition is obtained. The method can provide useful guidance to the designers and operators.
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