UNDERWATER ENGINEERING SEALS AND BEARINGS

MAINTENANCE AND REPAIR AFLOAT

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Summary

ä  Wärtsilä offer tailored and managed solutions for the underwater repair and maintenance of the Stern Tube Seals and Bearings.

ä  Our underwater repair and maintenance solutions help to minimise emergency repair cost, reduce down time and maintain schedules.

ä  Our solutions offer planning, equipment supply and repair supervision providing OEM assurances and dedicated project management.

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What can we do?

Underwater S&B Scope

Wärtsilä offer an extensive range of services that can be performed underwater, these include: •  Inspections •  Bearing wear down measurement •  Split water lubricated bearing removal •  Entanglement removal •  Rope guard work (Removal / Repair / Installation) •  Aft Seal repair •  Aft Stern tube blanking

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Repairs and Maintenance Afloat

Repairs Equipment failures are never planned and typically come when least expected. Performing critical repairs to stern tube seals and other equipment while keeping the vessel in service enables uninterrupted operation and continuity of performance. An extensive range of both Face type and Sealing ring type seals can be repaired afloat. This can be achieved either wet or via the instal-lation of a hyperbaric habitat allowing Lip type sterntube seals to be bonded insitu.

Maintenance Docking vessels is expensive! One option is to overhaul and maintain the seals underwater. Our products and capability provides a cost effective alternative solution for seal specific dockings. This allows operators to reduce downtime, maintain schedules and extend time between dry dockings

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Wet Repairs / Maintenance

What is it? Divers work directly on the product insitu while fully immersed. Scope of Work: •  Seal Repair (subject to seal configuration and

scope of work) •  Bearing wear down readings •  Rope guard removal/installation and modifications •  Blanking of open sterntubes for inboard seal work Repair/Maintenance can be preformed without stern tube oil contamination (subject to seal configuration) Minimises vessel schedule disruption

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Dry (Habitat) Repairs / Maintenance

What is it? Divers work directly on the seal in a dry environment using a Habitat installed between Propeller and Stern Tube Scope of Work: •  Seal Repair inc component bonding •  Seal removal and replacement /

retro fit. Repair / Maintenance can be performed without stern tube oil contamination. Maximises repair scope capability

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How we do it?

Way of Working

As part of the exceptional standards of support expected from an OEM we produce a detailed and comprehensive project proposal upfront. This document contains the scope of work, time frames and complete cost estimation based on duration and complexity of work. As well as identifying all spare parts and any specialist tooling.

Project Plan Project

Proposal

Project Procedure

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Additional work

Wartsila S&B offer a dedicated technical team to fully project manage the best solution. The team is equipped to deliver the best possible and most cost effective project. In addition they are able to provide specific project consultancy including RCA work, production of maintenance programs or scope extension including addition propulsion based tasks.

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Why choose underwater?

Typical Costs and Financial Savings

Vessel Type Problem Repair type Cost € (includes parts and labour)

Financial savings to customer.

Cruise Ship Outboard Seal Leakage

Visual inspection to confirm damage to Seal

40k

Cruise Ship Foreign object damage to outboard seal. High water ingress

Habitat repair. Full seal overhaul including secondary sealing arrangement replaced

350k Dry Dock Cost Cruise cancellation

Off shore supply vessel

Oil leakage due to fishing line damage

Habitat repair. All 3 sealing ring removed and replaced

200k Dry Dock Cost Lost revenue off hire.

Container Vessel

Oil Leakage Habitat repair. Inspection of assembly and replacement of damaged sealing ring

250k Dry Dock Cost Off Loading Reloading

Cruise Ship Excessive water ingress and foreign object damage to seal assembly

Wet repair. Full primary interface and bellows removal and replacement

250k Dry Dock Cost Cruise cancellation or itinerary changes

Cruise Ship Rope Guard Damage Removal and replacement of Rope Guard

126k (excluding parts)

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Examples

Cruise Ship Repair

• Wärtsilä was contacted by a large Cruise operator with reports of high levels of water ingress through the port side Wärtsilä Oceanguard outboard seal. Due to the design of the seal it was possible to manage the leakage with no risk of water entering the sterntube oil.

• A diver inspection of the seal highlighted damage to the Silicone Carbide interfaces and a substantial amount of fishing line around the seal. Working in conjunction with the diving team and the Customer, Wärtsilä compiled a detailed repair plan to perform an extensive seal overhaul underwater.

• An afloat repair was performed within the confined restrictions of a hyperbaric habitat (a large fabric bag retained to the propeller and Sterntube filled with air, creating a dry environment for the divers to work on the seal).

• After much planning, training and preparation, a team of Wärtsilä representatives and divers joined the vessel in Rhodes to undertake this overhaul. The repair was successfully completed, without the need to dry dock, allowing the ship to set sail and with no detrimental affect to the cruise schedule.

• Warm and positive praise and feedback was received from the customer with respect to all elements of the job.

Oil Lubricated

Cruise & Ferry

Type: Passenger vessel 6,260 dwt

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Crane Platform Maintain

• There are only a very few dry docks in the world where this platform could be docked due to its depth, having a seal that can be repaired anywhere was a great benefit to the owner. In 2000, the platform was retrofitted with fully split Wärtsilä Sternguard seals (previously called Cedervall KR) due to the fact that these seals were fully serviceable under water.

•  In autumn 2008, the owner contacted Wärtsilä S&B to ask if an overhaul could be made to the seals without docking the vessel. The overhaul was done afloat resulting in huge cost savings and a very happy customer.

Oil Lubricated Offshore

Type: Crane platform (largest in the world)

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