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New seawater system be installed to provide seawater for the service on the converted FPSO?

asked Jul 13, 2014 in Operations by cuchiang (2,310 points)
Should existing seawater lift sea chests be sealed off and existing sea water pumps decommissioned and a new seawater system shall be installed to provide seawater for the service on the converted FPSO?

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answered Jul 13, 2014 by ekwuemesam (3,660 points)

Consider retention of the seawater lift chests and the followings:

  • Boroscopic inspection system capable of inspecting sea chest valves and sea chest condition without diver intervention during FPSO normal operation.
  • Replacement of all existing, retained, seawater cooling system shipside suction and overboard valves with high integrity type butterfly valves.
  • Additional isolation valves in the sea water crossover suction header so that essential cooling seawater is available at all times; even when one sea chest is under inspection (applicable for engine room only).
  • New reaction tank type MGPS to replace existing MGPS able to be maintained without closing sea chest.
  • Replacement of seawater cooling system shipside suction and overboard stub pipe pieces with minimum thickness equivalent to the adjacent side shell plate plus a corrosion factor of 3mm.
  • Bolt on type anodes inside sea chest box replaceable by divers.
  • Thorough inspection of existing PE coated seawater piping and replacement of any pipe that has suffered any pitting/grooving due to PE coating breakdown.
  • Minimum 6" shipside pipe pieces for easy ROV inspection.
  • Submission of new ICCP system covering underwater hull (including all new underwater structure and mooring equipment as well as the sea water suction system).
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