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.
Low-Pressure Chiller Leak Detection and Monitoring Low-pressure chillers are typically centrifugal chiller type refrigeration systems operating under a vacuum in the evaporator section of the system. The condenser and compressor sections could be at a slightly negative pressure or up to 15 psig positive pressure.