pitch wrote:
How do they purge the air that exists at atmospheric pressure when the tires are initially mounted? That's right, they don't.
Good question so I had to go looking to find out and there is a way to purge the air. From Get Nitrogen Institute:
The most common method used to fill tires with nitrogen is to first purge the tire of the existing air, down to 3 psi, and then refill the tire with nitrogen. This purge/fill cycle is often repeated to achieve the desired level of nitrogen purity (GNI recommends 93.4 percent in a typical passenger tire) and to remove any moisture in the tire. Any nitrogen dealer will have the nitrogen generating equipment that produces the nitrogen and a device that purges your tires of the air inside them.I was just at a big name tire shop and got looking to see what they do for their compressed air system. They don't have an air dryer of any sort and nothing to drain condensed moisture from the lines.
