Tracer gas explainedSeptember 12, 2019
When it comes to gas supply lines it is paramount that your system is well maintained and without any leaks, however at some point a leak will occur over time.
Generally you would instantly identify when you have a gas leak as you would smell it, but in some cases you could have a gas leak and not even know, as was the case with our latest leak detection.
Detect the Leak was instructed via our clients insurance company to undertake a trace and access on a gas supply line that services the heating system, after our client discovered they had a gas leak when replacing the boiler.
This was one of the instances where there has been a gas leak that has gone unnoticed without a smell to indicate a leak.
This is why Detect the Leak was appointed to carry out the leak detection, as we have all the latest technology to trace, locate and undertake repairs.
Arriving on site the gas supply line was traced from the meter towards the rising gas main at the rear of the property, finding the line to be running under cobble paving and slate slabs and stairs.
Therefore the use of tracer gas technology was used to locate the leak.
Disconnecting the gas meter and isolating the rising main into the house, we were able to charge the line to 500 millibar with tracer gas (5% hydrogen in Nitrogen) and monitor the pressure gauges.
Within 2 minutes we noticed a drop in pressure of 300 millibar, this confirmed the leak to be outside and below ground as suspected.
Keeping the line charged at 500 millibar and using our gas detecting monitor, we scanned along the route of the supply line for a detection of gas.
This proved to be successful as we detected a gas signature emanating out the ground where the gas supply line rises out of the ground.
With a positive leak positioning we had the confidence to lift the slate slabs knowing it was a matter of digging one hole to undertake a repair (no need for time consuming & unnecessary digging to locate the leak, saving on costs and minimising damage).
On completion of the excavation we uncovered a defective 32mm electrofusion weld t-piece.
The supply line was repaired, and the system tested finding no further drop in pressure which suggest there to be no further leaks.
In this instance, our client was lucky to have discovered there was a leak on the system from changing the boiler.
A yearly pressure test on your gas supply line is what we at Detect the Leak would suggest, this could save you on those utility bills especially if you have a leak that you are not aware of.