TYPES OF LEAK TEST WHAT IS BUBBLE LEAK TEST- LET'S DISCUSS!!!

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TYPES OF LEAK TEST:
Refrigerant Sniffers: There are a number of available instruments that have been tuned to detect a range of refrigerant chemicals. The units are generally used as sniffers on air conditioning assemblies, freezers, coolers systems and the like. They can be used to locate leaks. One can also use these devices to perform an accumulation test and then get quantitive results for a leakage value but this is not as common as helium or hydrogen testing.
Other tracer gases, e.g. SF6. As mentioned above helium and hydrogen are the most common tracer gases to be used. To realize the reason for this try to remember your Periodic Table, the two smallest elements are Hydrogen and Helium, this makes them the most searching gases for leak detection.
Dye Penetration Testing: This uses a water additive dye, such as “Pelican Ink Test” or a UV dye. Unfortunately, this tends to be a destructive test. It is mostly used when the two parts can be separated and then observed to see where the dye reached. This is often used for the testing of blister packs in the pharmaceutical sector.
Ultrasonic Testing: As a gas flows out of a larger leak, it can generate Ultrasound. This can be detected with ultrasonic microphones. There is also a variation of this in which an ultrasound emitter is placed inside a sealed volume. Both these techniques are used to locate leakage. Ultrasound is used because it dissipates easily and quickly so it gives a good directional capability to locate the leaks.
Ultrasonic Bubble Testing: This is similar to Water Submersal Testing but in this case instead of observing the bubbles, ultrasound emitters and receivers are placed in an array above the submerged parts. Ultrasound travels easier through water than air. By detecting the echo from the bubbles, one can measure the distance to where the bubble was detected.
Thermal Imaging Camera: Some of the latest thermal imaging cameras can be used to detect leakage. This is mostly applied to larger structures. The leaking gas may need to be higher (or lower) in temperature than the majority of the gas in the camera image. Also some gases at the same temperature also give off a different thermal signature, if the camera system is tuned to this you can see the leakage. This may be used for detecting leakage in large structures like pipelines etc.
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