LTS Futures project creates blueprint for repurposing gas networks for hydrogen use

Pipeline technology specialist, STATS Group (STATS), has played a leading role in SGN’s LTS Futures world-first project where a live 18” high pressure hydrogen pipeline was safely isolated.

STATS patented BISEP® tool - which is widely deployed on global oil and gas assets - was successfully deployed and has been proven as a leak-tight line stopping technology which is safe to use on high pressure hydrogen pipelines.

Meeting UK Net Zero targets will be one of the toughest modern-day challenges. The SGN LTS Futures project investigated the potential of repurposing the Local Transmission System (LTS) from natural gas to hydrogen to drive forward this target.

The success of the trial is a significant development in the drive to meet net-zero emission targets and could lead to the repurposing of SGN’s 11,600km UK gas network from transporting hydrocarbons to hydrogen.

The project was part of SGN’s successful LTS Futures trial carried out on a representative 30km stretch of pipeline which runs from Grangemouth to Granton in Edinburgh.

SGN were delighted with the outcome and said the lessons learned on LTS Futures would “create a blueprint” for repurposing the entire LTS to hydrogen and provide a “resilient backbone” for a net zero energy system.

The scope of work included the installation of a DNV proprietary Grouted Tee, to provide access for STATS to perform hot tapping, line stopping, swarf (drill cuttings) dispersal, and completion plug installation. As part of the Live Trial, the STATS BISEP line stopping tool, delivered a fail-safe, 100 percent leak-tight double block and bleed isolation.

The BISEP had to be validated to operate safely and leak-tight in high pressure hydrogen, which presented unique operational parameters. Unlike traditional line stopping technology, BISEP guarantees zero-leakage isolation, significantly increasing safety and reducing environmental risks.

STATS worked closely with DNV who provided a Grouted Tee to provide a branch offtake and suitable for use with hydrogen - which provides an alternative to live welding.

Neil Mackay, Senior Business Development Manager said: “Through close collaboration, SGN and STATS have proven the BISEP tool as the world’s only double block and bleed isolation technology for high pressure hydrogen pipelines.

“For the first time, hot tapping and leak-tight line stopping operations have been successfully executed on a UK hydrogen pipeline, overcoming challenges of horizontal deployment, swarf dispersal, and hydrogen’s unique properties. This required not just process adaptation but also the development of new procedures, tooling, and assurance processes.”

The safe isolation and modification of pipelines like the one used in the LTS Futures trial is essential to the entire hydrogen transition. Until now, no proven hot tapping or line stopping method existed which could ensure that repair, maintenance or modifications can take place safely and efficiently. Not least the reduced emissions from the use of BISEP technology whether in use for hydrocarbon gas or hydrogen.

Neil Mackay added: “SGN provided leadership within the LTS Futures program, while STATS contributed world-class line stopping services, working alongside DNV to remove a fundamental barrier to hydrogen deployment.

“This innovation will support every UK network operator, benefit millions of customers, and accelerate decarbonization. It is a world-first, delivered through collaboration, innovation and ambition, resulting in a body of evidence and operational knowledge that is transferable across the UK gas networks and beyond.”

Earlier, SGN’S chief strategy and regulation officer, Tony Green, said: “This landmark project is a major milestone for SGN and the wider energy sector, showing that the UK’s gas infrastructure can be repurposed for a net zero future. It demonstrates both infrastructure and workforce readiness for hydrogen, with our skilled engineers gaining vital experience through the live trial. Collaboration has been crucial, and working closely with INEOS and other partners has turned a complex concept into a success.”