Pipeline tends to move when operating temperature and pressure is higher than the temperature and pressure when the pipe is installed and tied in.
For long pipeline far away from the platform, the pipe is constrained so there is no expansion. (This is because the expansion of the pipeline is restrained by soil friction between seabed and pipeline and concrete weight coating.) However, for the pipeline near the platform, the pipe is partially constrained and it can expand freely towards platform. (The vertical riser leg is relatively flexible and does not provide much friction between seabed and pipeline)
For long pipeline far away from the platform, the pipe is constrained so there is no expansion. (This is because the expansion of the pipeline is restrained by soil friction between seabed and pipeline and concrete weight coating.) However, for the pipeline near the platform, the pipe is partially constrained and it can expand freely towards platform. (The vertical riser leg is relatively flexible and does not provide much friction between seabed and pipeline)
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