PROPELLER POLISHING
The underwater propeller polishing and the maintenance of smooth sur faces is vital in order to save energy and optimize the performance of the vessel. A rough propeller leads to power loss, which increases fuel con sumption. Studies have shown than propellers may be polished every 2/3 months to sustain the vessel’s peak efficiency.
HULL CLEANING
A significant operating cost for the Owners/Charterers is the fuel. A reduction in fuel consumption will be reflected in a direct reduction in ope rational costs as up to 70% of a ves sel’s energy is required to overcome hydrodynamic resistance (Drag). Regular maintenance of the hull and propeller surfaces will minimize drag therefore, improving the vessel’s performance.
Cleaning the hull regularly prevents bio fouling build up therefore, leng thening the effective life of the anti-fouling coating and sustaining the anti-corrosive coating system for longer period. Removing calcareous growth at its first stage reduces the likelihood of external hull corrosion and pitting. During every cleaning, Global Underwater Services SL care fully inspect each aspect of the hull.
DOUBLER PLATE
A small piece of plate attached to a larger area of plate that requires loca lized strengthening, usually at the attachment point of a stiffener. Also, a flat plate welded to a plated structure that has suffered damage.
BLANKING & PLUGGING
Blanking or plugging is performed to enable crew members to conduct internal repairs.
TRANSDUCER REPLACEMENTS
Transducers can fail and replacement is necessary for correct readings and the safety of the vessel; this is another feature repair Global Underwater Services SL can conduct for the ves sel’s smooth operation.
ENTANGLEMENT REMOVAL
Entanglements on the propeller shaft can cause adverse issues for the per formance of the vessel as rope guards and stern seals can be damaged. It is imperative entanglements are remo ved immediately in order to avoid larger issues, resulting in increased costs.
ANODE REPLACEMENT
Cathodic protection is a method for preventing corrosion on submerged metallic structures. The technique is based on converting active areas on a metal surface to passive, in other words making them the cathode of an electrochemical cell. The simplest method to apply cathodic protection is by connecting the metal to be pro tected with another more easily corroded metal to act as the anode. Zinc, aluminum and magnesium are the metals commonly used as anodes therefore, anode maintenance is essential
Class Inspections
Class In-Water Survey and general hull inspections for in-lieu of dry-dock, to postpone dry-docking, sales/purchase, damages evaluation, etc.
Visual, photographic and cctv-monitor coverage with divers to surface communication system and full hull technical written divers report complete with video recording and still photos.
Tail-shaft weardown readings and rudder pintle clearances measurements.
Ultrasonic thickness plates measurement.
