Pipework Maintenance Programme

The Maintenance Programme outlines the actions to be taken to inspect steel pipelines used for high pressure gas transmission, using an inspection system working from inside the pipelines with the inspection equipment mounted on vehicles propelled by the gas flow.

On-line inspection is an acceptable method of inspection for pipelines.

The equipment used must measure within the limits necessary to judge the significance of previously unknown features, which could be defects likely to affect the structural integrity of the pipeline. The results of on-line inspection must be used to assess the structural integrity of a pipeline. This should enable a responsible engineer to make a comparison between the current condition of the pipeline and the requirements of the pipeline's original design or present usage, thus ensuring that the pipeline continues to operate within appropriate parameters and is fit for purpose.

The Maintenance Programme also includes inspection systems, which are carried out external to the pipeline. These include above ground pipework surveys, aerial surveys, vantage point surveys, for pipelines that cannot be aerial surveyed due to flying restrictions, road, rail and river crossing surveys.

Safety is at the heart of everything we do.

These surveys are in place to ensure we achieve the highest possible levels of safety for our employees and contracting partners and the public at large.