LEAK TESTING (LT)
Leak Testing (LT) is used to detect and locate through leaks using bubble technique according to bubble test procedure EN 1593. The bubble test it is an efficient and safe leak testing procedure of the welding seams of containers, pipes and many other welded structures.
The basic principle of this method consists of creating a pressure differential across a leak and observing for bubbles in a liquid medium located on the low-pressure side. The sensitivity of the method is dependent on the pressure differential and the liquid used for testing. As long as the pressure differential can be maintained across the tested area, this method can be used.
Under a sealed vacuum pressure chamber, foam shows up where air flows through leak path. To ensure that even small leaks become visible the vacuum in the pressure chamber must be maintained for at least 30 seconds.