Introduction

Prior to July 1978 several pedestal crane accidents which resulted Prior to July 1978 several pedestal crane accidents which resulted in considerable investigation by the Department of Energy. The outcome of the investigation resulted in legislative changes in crane operation, the most stringent being the requirement for inspection of the slewing ring bearings within a fixed period of time and thereafter at three yearly intervals.

Total Oil Marine (TOM), as a result of this legislation, commenced various studies to investigate the safest and most economical methods of completing the required inspection.

These studies confirmed that for TOM the best method would be to lift the cranes from the pedestals to provide maximum flexibility for undertaking all work envisaged. The lifting would be done, using a derrick crane for which the primary installation already existed on the north deck of the platform (MCP-01).

HISTORY

The intermediate manifold platform - MCP-01, is located midway between the Frigg Field and the shore terminal at St. Fergua Scotland. This prestress concrete structure incorporate the Jarlan breakwater wall prestress concrete structure incorporate the Jarlan breakwater wall concept.

The platform has two permanently mounted pedestal cranes which provide the means for lifting onboard the platform. These cranes are situated on the East and West sides of the platform at an elevation of 30m above the north deck.

Each crane is capable of lifting 132 long tons at radius of 28 feet, and is powered by a 565 h.p. Caterpillar D346 turbo-charged diesel engine.

The cranes were originally commissioned in the summer of 1975 and for the following two years were actively engaged in the construction of the platform, at times being utilized 24 hours a day in the very extreme platform, at times being utilized 24 hours a day in the very extreme conditions which have become an accepted hazard in the North Sea industry. The crane upper works rotate on fully enclosed anti-friction bearings, transmitting all radial, axial and moment loads to lower mountings.

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