What the Libra zodiac sign is all about: Libra is the seventh of the 12 zodiac signs, which begins its cycle in early fall every year during Libra seasonâwhich falls around September 23-October 22.
How it works. This schematic shows the component parts of a typical leak-down tester. The gauge on the right is held at a standard pressure by adjusting the pressure regulator while the gauge on the left shows an example reading of 85-or 15% leakage.
Leaks in underground pipelines can be detected by the injection of a radioactive isotope. This is achieved by adding a small amount of a radioisotope which is a source of beta radiation to the fluid.The area above ground where a high intensity of beta radiation is detected will pin point the leak source in the pipeline. This saves time as the correct area is dug up.his is achieved by adding a small amount of a radioisotope which is a source of beta radiation to the fluid. The area above ground where a high intensity of beta radiation is detected will pin point the leak source in the pipeline. This saves time as the correct area is dug up.