System and method for cutting of offshore structures
AssigneePetroliam Nasional Berhad (Petronas)
InventorMohd Izzat Mohd Thiyahuddin
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Abstract
A system for cutting an underwater structure, the system comprising: a cutting head, said cutting head comprising: an abrasive water jetting nozzle; a cryogenic nozzle; said abrasive water jetting nozzle and cryogenic nozzle mounted in fixed spaced relation; said cutting head arranged to position tips of the nozzles proximate to a cutting surface, and arranged to form a cutting zone defined by the nozzle tips and cutting surface; wherein a water repelling shield is located about said cutting zone and arranged to hinder water entering said cutting zone.
Claims11
A system for cutting an underwater structure, the system comprising:
- a cutting head, the cutting head comprising:
- an abrasive water jetting nozzle;
- a cryogenic nozzle;
- the abrasive water jetting nozzle and the cryogenic nozzle mounted in fixed spaced relation;
- the cutting head arranged to position tips of the abrasive water jetting nozzle and the cryogenic nozzle proximate to a cutting surface of the underwater structure, and arranged to form a cutting zone defined by the nozzle tips and the cutting surface;
- and
- wherein a water repelling shield is located about said cutting zone and arranged to create arid conditions in the cutting zone.
A method for cutting an underwater structure, the method comprising the steps of:
- placing an abrasive water jetting nozzle and a cryogenic nozzle in fixed spaced relation to form a cutting head
- positioning the cutting head proximate to a cutting surface of the underwater structure;
- forming a cutting zone defined by tips of the abrasive water jetting nozzle and the cryogenic nozzle and the cutting surface;
- locating a water repelling shield about the cutting zone;
- creating arid conditions in the cutting zone;
- and
- cutting the cutting surface using an abrasive water jet emanating from the abrasive water jetting nozzle.
Dependencies are inferred from the claim text.