Gas Services
Radius Subterra delivers specialist pipeline engineering services for gas transmission, distribution, and industrial networks.
Our teams provide safe, efficient and compliant solutions for live connections, flowstopping, testing, maintenance, and replacement across the UK and beyond.
Our teams provide safe, efficient and compliant solutions for live connections, flowstopping, testing, maintenance, and replacement across the UK and beyond.
Flowstopping
Our teams deliver safe, controlled flowstopping on gas mains using bag-off, squeeze-off, and advanced stopple systems, including folding-head and Minimuss line-stop technology. These methods enable live gas network interventions, minimise disruption, and provide secure, temporary containment for repairs, diversions, and asset upgrades.
Pipeline Repair & Maintenance
Radius Subterra offers rapid-response pipeline repair and maintenance services for polyethylene (PE) and metallic gas assets, including leaking fittings, damaged sections, valve installations, and reinforcement works. All repairs follow gas industry specifications, using specialist tooling and controlled procedures to reduce risk, downtime, and excavation requirements.
Under Pressure Connections
We deliver safe, fully live under-pressure connections on polyethylene (PE) and metallic gas mains of all materials, diameters, and pressure classes. Our capabilities include standard and bespoke electrofusion branch saddles and purpose-designed metallic under-pressure tees, enabling new feeds, bypasses, and network upgrades without shutdowns or service disruption.
Pipework Installation & Mainlaying
We install new polyethylene (PE) and metallic gas mains for both distribution and industrial networks, covering all pressures from low to intermediate. Our teams deliver open-cut and alternative installation methods, covering jointing, tie-ins, and commissioning. All work follows strict gas-sector standards with full reporting, including weld records, pressure tests, as-built data and asset traceability.
Pressure Testing
We carry out full pressure testing and commissioning for new and existing gas pipelines, ensuring network integrity, regulatory compliance, and operational readiness. Our technicians deliver controlled, traceable testing with digital reporting, giving stakeholders confidence that pipeline assets are safe, reliable, and ready for connection or return to service.
Pipe Cutting
We provide precision cold-cutting of metallic and polyethylene (PE) gas mains using engineered, spark-free equipment for both longitudinal and circumferential cuts. Our controlled methods protect inserted PE pipelines, reduce operational risk, and support safe replacement and connection. Every operation is planned, monitored, and fully recorded to ensure compliance and safe execution.
Manufacture & Fabrication
Our in-house engineering capability produces specialist fittings, fabricated components, and bespoke solutions for gas networks. We manufacture polyethylene (PE) fabrications, metallic under-pressure tees, completion plugs, stopple tees, adapters, and project-specific assemblies to meet complex operational requirements. All items follow controlled welding, machining, and QA processes, ensuring full compliance for live gas operations.
Engineering & Project Management
We provide end-to-end project engineering support for gas infrastructure works, managing planning, design reviews, technical assurance, and on-site coordination. Our teams oversee risk assessments, construction sequencing, temporary works, and operational delivery to ensure safe, compliant, and efficient execution across all gas sector projects.
Pipe Lining
We provide specialist pipe lining services for gas networks, rehabilitating metallic pipelines to restore integrity, seal defects and extend service life. Our close‑fit lining techniques minimise excavation and disruption while maintaining safe, compliant operation across distribution and specialist gas infrastructure.
We deliver pre‑insulated pipework solutions for specialist gas infrastructure where temperature control, protection and mechanical integrity are essential. Our teams manage installation, repair and replacement works on complex assets, ensuring insulated systems perform reliably in energy centres, plant interfaces and controlled environments.
Case Studies
Discover the prowess of Radius Subterra through our latest case studies.
Witness how we excel in tackling intricate pipeline challenges with innovative solutions and state-of-the-art technology. Stay tuned for more videos showcasing our commitment to engineering excellence.
Faced with severe leaks in a critical 1500mm trunk main, Radius Subterra provided an innovative pipeline rehabilitation solution using their close-fit PE liner system. This approach restored the pipeline’s integrity
Discover how Radius Subterra’s precision engineering revitalises a historic London waterway with cutting-edge pipeline solutions, installing a bespoke branch saddle onto a live water main in Finsbury Park. This job
Radius Subterra partnered with Anglian Water to solve leak issues in a hard-to-reach 10” water pipeline in East Anglia. Using their innovative Rolldown & Slipline method, Subterra maximised pipe bore
Case Studies
Discover how Radius Subterra delivers safe, innovative and technically assured solutions across the UK’s most challenging pipeline environments.
Faced with severe leaks in a critical 1500mm trunk main, Radius Subterra provided an innovative pipeline rehabilitation solution using their close-fit PE liner system. This approach restored the pipeline’s integrity
Discover how Radius Subterra’s precision engineering revitalises a historic London waterway with cutting-edge pipeline solutions, installing a bespoke branch saddle onto a live water main in Finsbury Park. This job
Radius Subterra partnered with Anglian Water to solve leak issues in a hard-to-reach 10” water pipeline in East Anglia. Using their innovative Rolldown & Slipline method, Subterra maximised pipe bore
What our client’s say about us
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