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OPTICAL GAS IMAGING FOR THE FAST DETECTION OF GAS LEAKS

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hes jan 19 7OPTICAL GAS IMAGING FOR THE FAST DETECTION OF GAS LEAKS

It’s a fact of life that corrosion and exposure to the elements considerably increase the likelihood of gas leaks in chemical liquid tanks and their associated pipework and plant.  This presents a big problem as non-compliance with increasingly strict safety and environmental regulations can lead to huge fines and loss of production. (Read More)


Thermal imaging is already well established as a favoured method for detecting faults and monitoring the health of electro-mechanical systems but with specialist IR cameras it is also a great way to spot the source of gas leaks.  The technology, known as optical gas imaging (OGI), allows thousands of connections and metres of pipework to be monitored in one scan.  Any escaping gas is visualised as plumes of smoke on the camera’s LCD so its source can be easily pinpointed and remedial action taken.

OGI cameras use spectral wavelength filtering and Stirling cooler cold-filtering technology to visualise the infrared absorption of gases such as methane, sulphur hexafluoride, carbon dioxide and refrigerants. The technique allows maintenance engineers to incorporate safer, more efficient and smarter leak detection and repair programmes (LDAR), not only saving money but more importantly improving the safety of company personnel and assets.
Unlike traditional thermal imaging OGI is qualitative, not quantitative. Due to the environment variants and background energy differential, an OGI camera alone cannot determine the specific type or amount of gas escaping through a leak. And it should also be noted that no single camera will see all gases so it’s important to understand the application and its need.  For example, a VOC/hydrocarbon OGI camera will not see sulphur hexafluoride (SF6) and a carbon monoxide (CO) camera will not see refrigerants.

The inspection company, The Sniffers, is a big fan of OGI. It is employed to monitor installations particularly in the oil and gas, petrochemical and chemical industries and provide advice on how to reduce emission and energy losses and maintain the integrity of the pipeline network.  Its engineers’ prime task is to seek out unwanted fugitive emissions and by using OGI they are able to inspect assets up to nine times faster than with traditional toxic vapour analysers (TVAs).  

“We’ve been performing LDAR projects for fugitive emissions around the world for more than 25 years and OGI is now an essential tool for us to get the job done quickly and safely,” explained project leader Bart Segers. “With a TVA probe, you have to approach your target really closely, which is not always possible or even safe.  With an OGI camera you can monitor large areas from a safe distance and get an overview of the entire target without having to build scaffolds.”

Another major benefit of OGI is speed.  Bart Segers continued: “At a typical site we have to monitor about 500 sources.  With a TVA probe, this would take a whole day but with our cameras (FLIR GF 320 models) I can manage this is just 1.5 hours.”

Optical gas imaging is the ideal solution for monitoring a variety of liquids and plant equipment.  The camera models The Sniffers use enables its inspectors to visualise around 400 different gases including methanol, ethanol and benzene.  As the cameras are also intrinsically safe they often allow the company to respond to an emergency without the need for hot work permits.  This is another big time-saver and means production can be up and running again in the shortest space of time.

Bart Segers concludes: “We can also take digital pictures and an HSM movie with the camera which comes in handy when you report to the customer. They provide immediate evidence and demonstrate the severity of the leak so appropriate action can be taken.”

For more details visit:
www.flir.com