Leak Detection Technology

Why Technology Matters in Leak Detection

Leak detection has evolved dramatically from the days of guesswork and exploratory demolition. Modern technology allows us to see through walls, hear through concrete, and detect gas escaping through microscopic pipe failures, all without causing any damage to your property. The equipment we use is not available to general plumbers or handymen. It requires specialist training, regular calibration, and years of experience to interpret the results correctly.

At Leak Detect London, we use a multi-technology approach on every survey. No single piece of equipment can find every leak in every situation, which is why we carry a full complement of detection technology to every job. By cross-referencing results from different methods, we achieve a level of accuracy that gives you confidence the leak has been found before any repair work begins.

Thermal imaging cameras detect infrared radiation emitted by every surface. When water leaks from a pipe, it changes the temperature of surrounding materials. Hot water heating leaks create warm spots on floors and walls, while cold water leaks produce cooler areas. Our FLIR T-series cameras have a thermal sensitivity of less than 0.04 degrees Celsius, meaning they detect temperature differences invisible to the human eye. The camera produces a colour-mapped thermal image where different temperatures appear as different colours, making leak locations immediately visible. We use this technology on every survey because it provides a rapid overview of the entire property, highlighting areas of concern that we then investigate in detail with acoustic or tracer gas equipment.

When water escapes from a pressurised pipe through a crack, hole, or failed joint, the turbulence creates a characteristic sound. This sound travels along the pipe wall and through the surrounding soil, concrete, or screed. Our ground microphones amplify this sound by thousands of times while electronic frequency filters strip out background noise from traffic, appliances, and other sources. By systematically moving the microphone across the surface, our engineers identify the point where the leak sound is loudest, which is the point directly above the leak. For long pipe runs, we use digital correlator technology. Two sensors are placed on the same pipe at known access points, and the correlator calculates the exact leak position by measuring the time difference between the sound arriving at each sensor. This gives precision to within 10 centimetres, even on pipes buried several metres underground.

Tracer gas testing is the most sensitive leak detection method available. We drain the pipework and fill it with a safe, inert gas mixture of 5% hydrogen and 95% nitrogen at controlled pressure. Hydrogen molecules are the smallest of any element, far smaller than water molecules, which means the gas escapes through even the tiniest leak that water might only seep through slowly. Once the gas is in the system, we use a highly sensitive molecular hydrogen detector at the surface above the pipework. The detector measures hydrogen concentration in parts per million, allowing us to pinpoint exactly where the gas is escaping and therefore where the pipe has failed. The gas is completely safe, non-flammable at this concentration, non-toxic, and dissipates harmlessly into the atmosphere.

We use professional Protimeter moisture meters in two modes. In non-destructive mode, the meter uses radio frequency signals to measure moisture content below the surface without making any contact mark. This is ideal for painted walls, tiled floors, and decorative surfaces where no damage is acceptable. In pin-type mode, two small pins are pressed into the material surface to measure electrical resistance, which correlates directly with moisture content. This gives more precise readings and is used on exposed plaster, timber, and areas where surface finish is not a concern. By taking systematic readings across walls and floors, we build a moisture map that shows exactly where moisture levels are elevated and how the moisture is distributed. This mapping reveals the pattern of water migration and helps us trace the moisture back to its source, distinguishing between rising damp, condensation, and active pipe leaks.

Endoscope cameras are miniature video cameras mounted on flexible or rigid probes that we insert into pipes, wall cavities, ceiling voids, and other enclosed spaces. The camera transmits a live video feed to a handheld screen, allowing our engineers to visually inspect the internal condition of pipework and identify the exact point of failure. Flexible endoscopes can navigate bends and junctions in pipework, while rigid borescopes are used for straight-line inspection of shorter sections. The cameras include LED illumination so they work in complete darkness, and we can record video and capture still images for inclusion in reports. For pipe inspection, we can identify corrosion, joint failures, cracks, root intrusion, and displaced connections without excavating or removing the pipe.

Pressure testing is the foundation of every leak investigation. We isolate individual plumbing circuits using existing valves or temporary isolation equipment, then pressurise each circuit to its normal working pressure using a digital gauge accurate to 0.01 bar. We then monitor the pressure over a set period, typically 15 to 30 minutes for an initial test. If the pressure drops, we know that circuit has a leak, and the rate of pressure drop indicates the severity. By systematically testing each circuit in the building, including cold water supply, hot water, central heating, underfloor heating, and any other pressurised systems, we determine exactly which system is leaking before deploying any detection equipment. This prevents wasted time investigating the wrong system and ensures our acoustic, thermal, or tracer gas survey is targeted at the correct pipework from the outset.

Technology Comparison

Our Multi-Technology Approach

The real power of our service comes not from any single piece of equipment but from the way we combine technologies to build a complete picture. A typical survey might begin with pressure testing to confirm the leak and identify the affected system, move to thermal imaging for a rapid overview of the property, then use acoustic detection to pinpoint the exact pipe failure, and finish with moisture mapping to document the extent of damage for your insurance claim.

This multi-technology approach is what separates professional leak detection from the guesswork that some plumbers offer. Every technology has strengths and limitations, but by combining them intelligently, we achieve detection rates that consistently exceed 95%. When you book a survey with us, you get access to the full range of equipment and the expertise to use it effectively. Learn more about our specific detection services on our water leak detection, thermal imaging, and acoustic detection pages.

Leak Detection Technology FAQs