Propeller Polishing Services Kamsar

A new or well-polished propeller has a smooth, mirror-like surface. Over months in service, the surface becomes rough through corrosion, erosion and fouling. Propeller polishing services in Kamsar restore this finish in the water, using specialised tools operated by a Diver. For a ship that cannot dry-dock for a long time, polishing is one of the most effective ways to recover performance.

What Polishing Does

Polishing removes a thin layer of metal and the deposits on it, leaving a smooth surface that water can flow over with less friction. Roughness is typically described by a value such as Rz or Ra, and standards such as ISO 484 give target finishes for new propellers. In-water polishing aims to bring the surface closer to these values, although it cannot match a workshop result exactly.

The Polishing Process

• Shaft locked and engine isolated, as for any propeller work.
• CCTV inspection and photographs of the blades as found.
• Cleaning of growth and hard deposits from all blade surfaces.
• Grinding of heavy roughness and removal of minor damage using underwater grinding tools.
• Polishing in stages with finer abrasives, to a smooth finish.
• Final inspection and photographs, with roughness comparison where measured.

Equipment

We use underwater polishing machines with rotating discs, driven by hydraulic or electric power, and a range of abrasive discs and brushes. The Diver works across each blade face, usually starting at the root and finishing at the tip. Finishing is done by hand where the machine cannot reach, such as near the hub or along the leading edge.

Expected Results

Industry estimates suggest that polishing a roughened propeller can recover several per cent of propulsive efficiency, and results as high as 5 to 10 per cent have been reported on severely roughened propellers. The result depends on the starting condition, the speed profile and the ship type. Owners can check the effect through noon-report data on speed and consumption before and after polishing.

Limits of In-Water Polishing

Polishing is not a repair for large bends, deep cracks or missing metal. If the survey shows structural damage, the propeller may need a workshop visit or a replacement. Polishing also takes away a small amount of metal each time, so the blade profile must not be altered. Our Divers follow set procedures to preserve the blade shape, and they stop and report if they find damage that polishing cannot cure.

Reports

After polishing, you receive photographs of every blade before and after, notes on damage found and a clear statement of the work done. If required, a roughness measurement can be made with a portable instrument before and after, giving the owner a measured result.

Order Polishing

Tell us the ship's propeller type, last polishing date and any concerns, and we will plan the work.

Recording Propeller Condition Over Time

Each polishing visit gives an opportunity to record the propeller condition. We photograph each blade, note the roughness and mark any damage. Over several visits, owners can see how quickly roughness returns and how it relates to trading conditions. This helps them choose the best polishing interval and decide when a propeller overhaul in a workshop becomes worthwhile.

When Polishing Is Not Enough

If the propeller is deeply pitted, badly eroded or damaged, polishing gives only a limited improvement. In that case, a workshop overhaul or replacement is more cost-effective. We assess the blades and tell the owner honestly if polishing will be worth it.

Frequently Asked Questions (FAQ)

Q1. How long does propeller polishing take?

Typically 3 to 6 hours for one propeller, depending on the roughness and the number of blades.

Q2. How much efficiency can polishing recover?

Industry reports cite several per cent in typical cases, and up to 5 to 10 per cent where the propeller was very rough.

Q3. Does polishing change the blade shape?

It should not. Only a thin layer is removed, and the Diver works carefully to preserve the profile.

Q4. What standard defines propeller finish?

ISO 484 sets accuracy and finish classes for propellers, which polishing tries to approach.

Q5. How often should a propeller be polished?

Many owners polish every 12 to 24 months, with cleaning in between, depending on trading and propeller condition.