DIVING STATUS UNDERWATER SERVICES

441, Konstantinoupoleos St Acharnes 136 77, Greece

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+30 210 571 9252

DIVING STATUS was established in Greece in 1976 with a significant focus on delivering subsea commercial diving services for the shipping and the oil & gas industry.

DIVING STATUS is an international marine contractor that delivers underwater inspection, underwater hull cleaning, propeller polishing, NDT inspection, ROV inspection, underwater welding & cutting, ship repairs, anchor recovery and many more.

DIVING STATUS has invested in powerful sophisticated equipment and intensive training programs to deploy experienced, qualified technician/diver teams and Naval Engineers, who can provide underwater services according to IMO, ADCI and US NAVY.

Following our customers’ needs, our company expanded in the Cyprus (DIVING STATUS – Cyprus) and Malta (DIVING STATUS – Malta) providing underwater services at any vessel that passes in the Mediterranean & Black Sea.

PROPELLER POLISHING

The presence of even immature barnacles or tubeworms on the propeller causes a severe loss in propulsion efficiency. The technical solution on this problem is removing all calcium deposits and any basal plates with propeller polishing. Propeller polishing should be carried out to maintain the propeller surface roughness at or near-equal to Rubert scale A.

In service, regular underwater cleaning and reconditioning of the surface of a propeller is done with a small rotating disk that can easily conform to the complex shapes of the blades without gouging the surface. This tool removes all fouling and produces a very fine surface scratch pattern in the range of 1 to 2 μm. This is similar to what would be expected of a newly manufactured blade surface. Any large nicks or damage, especially to the leading edges or tips, should also be repaired and smoothed out.

 
diver polishing propeller
 
diver polishing propeller
 
 
 

To easily assess the condition of the surface it is common to use a comparison guide like RUBERT SCALE SHIP PROPELLERS ROUGHNESS GAUGE that provides actual surface roughness examples for visual and tactile comparison. The specimens are labeled A to F, with A and B representing expectations for the roughness after polishing.

 
propeller
 
 
propeller
 

Necessary equipment:

  • Polishers
  • Handheld brushes
  • Abrasive & Diamond Discs
  • Rubert scale comparator (Ship Propeller Roughness Scale)

Materials of Cleaning Discs:

  • Diamond
  • Silicon Carbide
  • Aluminum oxide

The bristle size, abrasive grit and matrix and density of the fiber can make these discs more or less aggressive.

PROPELLER POLISHING GUIDELINES

  • Our purpose is to remove fouling and provide a smooth surface.
  • Extreme care must be taken to retain the proper contour of the 3-inch area adjacent to the propulsor leading edges, trailing edges and tips.
  • Localized fouling concentrations should be spot-cleaned
  • The personnel shall be familiar with the critical areas and areas of high curvature geometry.
  • Positive control of the equipment to prevent tool motors, housings and controls from contacting the propulsors surface
 
 

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