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Rack Phase Differential Monitoring (RPD)[RPD]monitoring system provide extremely accurate, automated and real time management for safely and speedily lowering and positioning the legs of jack up rigs in all types of seabed terrain. Our Simulator automatically shuts down the jack up process if the operator does not respond fast enough to warning signals.
Rack Phase Differential Monitoring, Managing and Cope with it (RPD)[RPD]
[wiki/Rack_phase_difference] When a jackup positions its spudcan - i.e. the shoe mounted at the bottom of the leg - onto the seabed the mass of the vessel pressing down onto the seabed will cause a reaction force. If the seabed is inclined, or the spudcan does not travel straight through the soil due to the consistency of the soil layers encountered during leg penetration, the forces acting on the chords will be unequal which causes a chord - and the rack attached to it - to move ever so slightly up- or downwards. This up- or downwards displacement is the Rack Phase Value (RPV), and can be positive or negative. The sum of the absolute values of the RPV is the Rack Phase Difference.
This relative displacement between the racks causes additional loading on the leg members, which induces additional stresses between
• the rack and pinion teeth that are meshing during the jacking operation, which increases rack and pinion wear
• the rack teeth and the upper and lower leg guides, which increases rack wear on the tips
• the welded connections between bracings and chords
The RPD limit should be clearly defined by the designer of the jack-up rig, and is subject to narrow design and as-built tolerances. The better the design tolerances are followed during construction, the lower the RPD will likely be during jacking operation1s, and the less wear the system will encounter. Excessive loading may result in failure of structural members in case the RPD reaches more than the allowable value.
[wiki/Rack_phase_difference]
• cracks in welds between structural members
• buckling of bracings
• shearing off of rack and pinion teeth
• deformation of the leg guide plate supporting structure
• damage on the drives (e.g. internal planetary gear damage, damage on bull gears, shearing off of shaft keys, ...)
Rack Phase Difference (RPD)[RPD], Watch your RPV's RPDs a FREE course by [email protected] | www.RigMoveMasterClass.com Rack Phase Difference, Rack Phase Differential, RPD, RPV, Rack Phase Value, Rack Phase Variation, Rack Phase Differential Monitoring (RPD)[RPD] RPV's, RPD's. Free RPD Course Lesson 1 of 4. What is RPD, What is RPV, How to Calculate RPD, How to measure RPV, Why RPD management, How to manage RPD, How to Cope with RPD, RPD Training, Rpd Training and guidance, Rpd Monitoring, RPD Monitoring Systems. R.P.D [RPD] [Rack Phase Differential Monitoring (RPD)] [Rack Phase Differential Monitoring