Helium Leak Testing


Aptest NDT Services we supply Helium based solutions; we can offer a range of different Helium leak test solutions to meet our customers’ requirements. We specialise in Helium leak testing, which, among all, represent the ideal solution for leak testing. This method is characterised by a very high level of sensitivity, quantifiable and reliable results, and the possibility to partly or fully automate the process, integrating it directly into the manufacturing line too if required.


Helium Leak Detection

A Helium Leak detector, also known as a Mass Spectrometer Leak Detector (MSLD), is used to locate and measure the size of leaks into or out of a system or containing device.   The tracer gas, helium, is introduced to a test part that is connected to the leak detector.  The helium leaking through the test part enters through the system and this partial pressure is measured and the results are displayed on a meter.


Helium Leak Testing Services for Power Plants:

If you are in the power generation industry,  regular helium leak testing can catch leaks before your plant loses efficiency and costs you significant money.

Loss of efficiency is the main reason power plants should leak test their condenser vacuum systems. We can help you identify and locate the source of problems quickly, so you can minimize unit downtime and increase unit profitability.


Hard Vaccum Test:

he hard vacuum test involves filling the test part with helium, placing it in a test chamber connected to the the analyzer cell and removing air from the chamber.The detector measures the flow of helium escaping from the part through all the leaks at the end of the test cycle. The leak cannot be located


Sniffing test:

The sniffing method involves pressurizing the tested part with helium. The detector samples the helium escaping from the part via a LDS (long distance sniffer) probe. The sniffer probe is moved over potential leak areas and the leak can be located.


Spraying test:

The spraying method (inboard testing) involves removing air from the test part, connecting it to the analyzer cell and then spraying helium over the outer surface. Potential leaking areas are sprayed with helium. The detector measures the flow of helium penetrating the part, and the leak can be located.


Spraying test:

  • 1. System is tested at, or close to, working pressure
  • 2. Leaks are detected and quantified, which enables immediate repair or monitoring over time
  • 3. Improves & Extends the safe operation of process plant and equipment
  • 4. Assures that the environment is not contaminated
  • 5. Detecting hazardous hydrocarbon leaks assures the health of personnel
  • 6. Helps maintain compliance with strict safety standards