GUIDANCE MANUAL FOR THE INSPECTION AND MAINTENANCE

OF TANKER STRUCTURES

A joint publication from the Tanker Structure Co-operative Forum (TSCF)

and the International Association of Independent Tanker Owners (INTERTANKO)

Michael Osborne, Consultant

Regulatory requirements

Classification:

ISM:

“…….subject to normal maintenance”

“10.1 The Company should establish procedures to ensure that the ship is maintained in conformity with the provisions of the relevant rules and regulations and with any additional requirements which may be established by the Company. “

Erika – Dec 1999

.

Prestige – Nov 2002

The Need for Guidance on Maintenance

• Education

• Consistency

• Class

• EMSA

Inspection and Maintenance Plan

• Spaces to be inspected

• Frequency of inspection

• Record results

• Acceptance Criteria

• How to do it (access and details)

Corrosion and fractures in the air (vapour) space at the top of the tank (due to sun on deck).

Pitting of upper surfaces of horizontal structure and bottom plates.

Coating condition (where applicable) and anode wear.

Fractures in way of deck and bottom transverse toe connections to longitudinal bulkheads.

Guidance for Inspection of Cargo Tank

Fractures in way of stringer toe connections to longitudinal bulkheads and bottom transverses.

Fractures in way of centreline girder connections bottom transverses and bulkheads.

Erosion under suctions.

Condition of pipework, valves and fittings.

Condition of access structure (ladders and Platforms etc.).

Cargo tanks (cont’d.)

Who provides documentation for the maintenance of transport vehicles ?

Aircraft ? Designer/Builder

Road Vehicles ? Designer/Builder

Marine Diesel Engines ? Designer/Builder

Ship Structures ? ???????????

The Shipbuilders’ Role

Design for reduced maintenance

Provide advice on areas for inspection

Design for ease of inspection

Provide sketch maps

Provide advice on areas for inspection:

The Shipbuilders’ Role

Design for reduced maintenance

Provide advice on areas for inspection

Design for ease of inspection

Provide sketch maps

Provide access for inspection

The Shipbuilders’ Role

Design for reduced maintenance

Provide advice on areas for inspection

Design for ease of inspection

Provide sketch maps

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D e ck P la tin g

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B o ttom S h e ll

Route through a tank

Conclusion

There is a need for more guidance on the maintenance of tanker structures

Shipbuilders can assist by:

Improved designBetter information for ownersProvision of pro-formas