Two Case Studies are used to illustrate the use of pressure pulsing in the detection and removal of blockages from long subsea pipelines. It is confirmed that pulsing is potentially capable of releasing blockages that have proved able to resist steady pressures of greater overall amplitude. However, it is also shown that significant hurdles remain in the use of pulses for the accurate location of blockages in long lines. Several contributory causes of the underlying difficulties are identified and an appeal is made to readers and conference delegates to consider possibilities for research to reduce the uncertainties.
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