SF6 is a highly effective insulating gas, but it is also a potent greenhouse gas with global warming potential many thousands of times higher than CO2. M3 based leak sealing gives transmission operators a way to significantly reduce SF6 emissions from ageing equipment without forcing outages.
We back every claim with data, test evidence and clear assumptions.
50+
Seals Placed
On electricity substations across the UK.
15,000+ tCO2e
Emissions Saved
Sealed while the leak was flowing.
Up to 10 bar
Flowing gaseous leak can be sealed.
0
Requirement To De-Gas
If its safe to work in the area, we will deploy without an outage.
Reversibility
Metal seals that do not close off future options
M3Cast for SF6 leak sealing creates a solid metal seal, but it is not a permanent modification. The alloy can be reheated and removed, so equipment can still be inspected, overhauled or replaced later. RW Seals has safely removed seals on electricity substations.
Alloy can be reheated and safely removed
Original component can be accessed and inspected
Supports long term replacement and decommissioning plans
Every SF6 project follows a structured process, delivered under ISO 9001:2015 and Achilles UVDB. You always know what stage you are at and what happens next.
01
Initial enquiry
Get in touch with your SF6 leaks and we will review photos and videos to make an initial assessment.
02
Survey and Feasibility
Survey the leak and confirm feasibility.
03
Design, Development and Testing
If we don't have a mould of the right size or shape, we will design, develop and test the solution.
04
Site Readiness
Work with you on site arrangements and RAMS.
05
Deployment
Deploy on your site through our appropriately trained team.
06
Reporting
Provide you with a report of the seal including asset tags and ID as required.
Development and Field Demonstration of M3 Technology for Transformer Oil Leak Sealing
National Grid Electricity Transmission (NGET) asked RW to investigate engineered solutions for sealing transformer oil leaks—an issue faced globally across transmission and distribution networks.
Rawwater provides on site SF6 leak repair services. Our experienced engineers manage the repair from start to finish. If you’re interested in a different service model, we’re happy to discuss tailored solutions to meet your needs.
The timeline depends on the complexity of the leak and site access. Developing a custom solution from scratch may take weeks, whereas repairs using pre-existing solutions can often be completed in a few days. We work closely with customers to minimise downtime and keep operations running smoothly.
Yes. If it’s safe for us to work in the area, our team can repair the leak without shutting down the system or de-gassing the equipment. This reduces costs associated with outages and gas handling, which can be significant.
Absolutely. SF6 seals can be reversed safely on site if required, and we can guide your team to this for temporary fixes. Our experience ensures that reversibility is safe and does not compromise system integrity.
We operate on a reasonable endeavours basis. While we don’t provide formal guarantees, our track record demonstrates consistent and reliable results across multiple sites and applications.
