May 2014
Gas Transmission
Above Ground Installation Integrity Decision Support Tool
May 2014
Jan 2016
National Grid Gas Transmission
Tony Stonehewer
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Network Innovation Allowance
Gas Transmission Networks
The project scope is designed to develop a risk based model for prioritisation of high pressure gas above ground installation integrity management and maintenance activities. Taking into account the threats posed by different damage mechanisms such as corrosion, vibration, over pressure, low temperature, fatigue assessments  on individual installations, this type of prioritisation system is a new  concept and will better enable the prioritisation of resources to the highest risk installations.

This work will determine how National Grid can best make decisions for prioritising maintenance and inspection for high pressure gas installations to maintain their availability for use by customers whilst meeting our safety obligations.

The project will use information from around the world including Europe, US and Asia from research bodies such as EPRG and PRCI to define the appropriate risk profile and consider the various options for above ground installation inspection and management. The work will consider the location, the failure mechanism likelihoods for installation assets and the prevention and mitigation measures in place for individual assets and the entire installation.

National Grid’s expenditure on the inspection and maintenance of its National Transmission System above ground assets is in the region of £4M per annum. The tool will be able to rank installations against each other for their propensity for failure and will help National Grid make informed choices for investing funds in maintenance and/or inspection activities for higher risk installations and ensure that we can continue to meet our customer and safety obligations in the most efficient way.

The project will therefore deliver both a specific piece of new equipment and also a novel operational practice

To develop a decision support tool for above ground installations, which would be fully validated and used to prioritise resources to the highest risk installations.

Delivery of the model, report and supporting guidance on how to use the model to make informed decisions.