Our state of the art leak detection equipment constitutes a complete field bases system on proven hydrogen-gas technology in addition to correlation techniques and devices.

We are capable of detecting leaks in underground pipework covered by a varietyof materials such as; dirt, mud, gravel, snow, concrete, asphalt and various types of tiles and cobble-stone paving.

  • Water pipeline
  • Gas pipelines
  • Heating systems
  • Petrol stations
  • Gas-filled power cables
  • Telephone cables

Yes, it leaks ... but where?


Hydrogen is actually the lightest element in the universe. The gas is 15 times lighter than air, and its viscosity is only half that of air and helium. Hydrogen spreads so easy throughout the test object, penetrates leaks more readily and it vents away significantly easier than any other trace gas. If you are worried about background build-up, hydrogen trace gas is the gas to use. It is also the most inexpensive trace gas you can get. Some leaks are so large that they can be seen with the naked eye, while others are so small that you need an advanced vacuum system in order to detect them. Most leaks are in between these two extremes. The Hydrogen Method, which works on the basis of detecting leaks with the aid of a trace gas containing 5% hydrogen gas (in nitrogen), covers this entire range.

Hydrogen gas has a number of unique properties which make it an excellent trace gas for use in leak detection:

  • The lightest of all molecules
  • Lowest viscosity of all gases (easy to fill, evacuate and dissipate)
  • Low background (0.5 ppm)
  • Environmentally friendly and renewable
  • Inexpensive
  • Non flammable (when diluted 5% in Nitrogen)
  • Non toxic - non corrosive

Pure hydrogen should never be used as trace gas. We use a standard industrial grade mix of 5%hydrogen in nitrogen. This mix is inexpensive, non- flammable, easily available and still holds the important features needed for using hydrogen as trace gas.


Hydrogen gas has a number of unique properties which make it an excellent
trace gas for use in leak detection:

  • The lightest of all molecules
  • Lowest viscosity of all gases (easy to fill, evacuate and dissipate)
  • Low background (0.5 ppm)
  • Environmentally friendly and renewable
  • Inexpensive
  • Non flammable (when diluted 5% in Nitrogen)
  • Non toxic - non corrosive

Below you will find some facts about hydrogen
and diluted hydrogen as trace gas.

  • Hydrogen gas has the lowest viscosity, mainly because the Hydrogen
    molecule only weighs half as much as a single Helium atom.
  • Hydrogen spreads quicker in a given volume because of its high molecular velocity
  • It finds and passes through a leak faster
  • It is easier to flush out and vent away
  • Hydrogen molecules do not stick to surfaces as easily as Helium atoms.That is why you get less problems with background interference from gross leaks and residual gas in tested objects.


Can locate leaks
Is independent of variations in temperature
Is perfect for testing soft objects
Is independent of size of test objects’ internal volume
Has a high sensitivity (Pressure Decay from 10E-2 ml/s, Hydrogen Method
from 5x10E-7 ml/s)



It is a widespread misconception that the flammability of Hydrogen would make it impossible to benefit from its advantageous properties in leak testing. In fact, Hydrogen is only flammable in the concentration range 4% - 75% in air or oxygen, and can only detonate in the range 18% - 60% in air or oxygen.

By using pre-diluted Hydrogen one can avoid the flammable concentration range altogether. Standard Hydrogen/Nitrogen mixtures are for example commonly used as shielding gases for welding purposes.
Hydrogen can therefore safely be employed for leak testing if used at the right concentration. A suitable concentration to use is the standard 5% Hydrogen / 95% Nitrogen mixture which is available in industrial grade from most gas suppliers. The price is only a fraction of the price for helium.

The 5% mixture is classified as non-flammable according to international standard ISO 10156. This standard not only describes how flammability limits of gas mixtures are to be determined, but also states that Hydrogen/Nitrogen mixtures containing less than 5.7% Hydrogen are non-flammable, irrespective of how this mixture, in turn, is mixed with air.


Hydrogen is a naturally occurring gas which is totally non-toxic and has no adverse effects on the environment. Hydrogen can be found naturally or produced with very simple methods. In fact we all have some hydrogen being produced in our stomachs!
The normal background level of Hydrogen in air is 0.5 ppm, while the level of helium, which is another common trace gas, is 5 ppm.

Other trace gases either comes from finite sources, are expensive to produce or are potentially toxic. Therefore Hydrogen is the most environmentally friendly choice to make when considering Leak Testing with a trace gas. A fact important to remember if your company holds an ISO14001 certificate or similar.