National Gas Transmission owns and operates the gas National Transmission System (NTS) — a 5,000-mile pipeline network that transports gas from terminals and ports to every part of Britain.
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Main Methodology Document 
MIPI Enhancements Project Update - Jan 2019
Measuring gas network outputs - Outputs of our engagement to date
Measuring gas network outputs - Service Risk Framework
Measuring gas network outputs - Consequence of Failure
Measuring gas network outputs - Probability of Failure supporting document
Methodology for Network Output Measures - March 2018
Measuring gas network outputs - a summary of our new methodology
Mini Grouted Tee
Maintenance Programme 2017-18 Review