Forth Replacement Crossing

Vibration Calculations

Vibration Monitoring

Pipeline Protection

THE CHALLENGE

IKM was contracted by BP to undertake vibration monitoring assessments for works being undertaken on the Forth Replacement Crossing.  The monitoring was required during work near the BP-operated Forties Pipeline System which is in close proximity to the new crossing.

THE SOLUTION

Before beginning vibration assessments, IKM’s environmental team prepared a site-specific monitoring methodology, established to ensure that the ground surrounding the pipeline would be monitored effectively and that vibrations detected stayed within the limits set out in previous reports. The monitoring was then undertaken at various locations along and adjacent to the pipeline so that a representative reading could be taken of the pipe vibrations whilst construction took place.

To ensure safety, equipment used to monitor the vibration levels was wired to an alarm system and flashing beacon, to alert site personnel if the levels reached the vibration limit. In the case of compaction activities, the beacon would flash to alert workers when compactor plant or equipment was operated within 500mm of the pipeline. When limits were exceeded, IKM advised operatives to increase the distance from the pipeline, to reduce ground-borne vibrations to acceptable limits.

The monitoring results showed that the PPV recorded for the majority of the works was within predicted limits and where it was exceeded was generally due to unexpected obstructions, such as large stones.

Client
BP Exploration Ltd

Client
BP Exploration Ltd

Location
Kinneil to Dalmeny

Location
Kinneil to Dalmeny

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