The tracer-probe test is conducted by placing the component under a vacuum and connecting it to the mass spectrometer. If a leak is present, the helium will be drawn into the part due to the differential pressure. The Hood test is conducted by placing the component under a vacuum and connected to the mass spectrometer.
The hood, which is normally made of a plastic material or bag, is then filled with helium to test a large area at one time. Helium leak tests and mass spectrometer testing is performed on many components in the nuclear, chemical and aerospace industries, among others.
It is imperative to ensure a component passes a helium leak test to ensure it is leak tight. Other components need helium leak tests to ensure that they are vacuum tight. The advantage of performing helium leak tests is the ability to find very small leaks in components. The presence of leaks in certain systems could be extremely hazardous both to personnel and to the environment.
Thank you for subscribing to our newsletter! Connect with us. Helium Leakage Test. A helium leakage test may also be known as a helium sniff test. Corrosionpedia Explains Helium Leakage Test Helium is an excellent tracer material choice for detecting leaks in industrial sealed containers because: It can penetrate through the smallest crack, hole or puncture due to its small atomic size.
It is chemically inert, non-flammable and non-toxic. Its presence in the atmosphere at 5 ppm is very minimal. It does not react with metal or any stored material and therefore doesn't cause corrosion or pitting.
There are two leakage testing methods: Vacuum testing, also called outside-in testing. Pressure testing, also called inside-out testing. Share this Term. Procedures 5 Ways to Measure the Hardness of Materials. Don't miss the latest corrosion content from Corrosionpedia! This means that careful engineering of the seals is necessary, particularly where complicated seals are required, such as right angled seals for 2 perpendicular faces.
One must also use helium leak tight valves and pipework and pay particular attention to the sizing of the vacuum pipework. There are a number of techniques to reduce the consumption of the helium gas. First of these is to mix the helium with another lower cost gas, either nitrogen or compressed air. This is only possible where the sensitivity of the test is not compromised by the mixing process.
The second of these is to re-use the helium from one test by extracting it from the device and then pushing it into the next device. This can often be implemented by a combination of a vacuum pump and simple air cylinder arrangement if the volume is not too large. The concentration of the helium can be monitored between cycles using a mass spectrometer or another sensor. If the concentration falls below an acceptable level, the helium should be removed and a new charge of helium is used.
The third technique is helium recovery. The helium is extracted into an intermediate holding vessel to then be compressed back to high pressure to recover the helium. We build all machines in-house, applying our extensive experience in specialised test and automated handling machines to the engineering projects we undertake.
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Your Name required. Your Email required. Your Phone. Your Message. Guide to Helium Leak Testing. Why use helium for leak testing? What are the benefits of Helium Leak Testing? Background Helium Concentration Helium can and will get everywhere if it can.
Helium leak testing at Lower Limits When testing at 1 x10 -9 and below, one may need to do additional things to be able to complete a viable test. The sequence might be: Evacuate both the part and chamber Back fill the test volume with certified clean dry nitrogen Re-evacuate Fill the part with the test gas Helium leak testing at high production rates When high volume production requires high vacuum, you must also consider the time taken to pump down to the required level of vacuum, this can be significant.
Helium Bombing for testing hermetically sealed containers When trying to test hermetically sealed containers, it would be good to try and insert some detectable helium in the assembly process prior to the final seal being made. Helium bombing and helium leak testing tooling.
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