Tracer gas leak detection across London

When thermal imaging and acoustic detection have ruled out the obvious but the leak still hasn't shown itself, tracer gas is the technique that closes the case. The principle is simple: hydrogen molecules are roughly half the size of water molecules, so they escape through any leak point that water can pass, usually faster and more reliably than the water itself. Detection probes calibrated to parts-per-million sensitivity reveal the gas as it emerges, even through 50mm of screed, floor finishes, plaster or insulation.

We use a 5% hydrogen / 95% nitrogen industrial tracer mix, the same standard used by Cadent Gas, Thames Water and other UK utility infrastructure operators. The mix is non-toxic, non-flammable (well below the lower explosive limit of 4%), inert to building materials, and harmless to human and animal occupancy. It's the safest and most precise leak-locating method available.

How we deliver

No surprises, no upselling. The exact path every job follows.

1. 1
   System depressurisation & drain-down
   All water removed from the suspect system.
2. 2
   Tracer gas introduction
   5/95 H₂/N₂ mix introduced at low controlled pressure (typically 0.2 bar).
3. 3
   Surface scan with sniffer probe
   Sensitive electronic detector run across all suspect surfaces.
4. 4
   Pinpoint isolation
   Where improved readings detected, micro-survey to identify exact leak point.
5. 5
   Verification scan
   Repeat scan to confirm location is repeatable and not a false positive.
6. 6
   System recommissioning
   Gas vented. System re-pressurised with water. Final integrity test.
7. 7
   Insurance-grade written report
   Located leak point marked on plan. Recommended access cut.