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One thing you may not notice about your NASH pump is its ability to remove solids and dust from incoming air. The air actually gets "scrubbed" by the liquid ring. NASH once did a scientific tests at a laboratory showing the ability of the NASH compressor to remove contaminates such as bacteria, lint, dust and other pollutants from the incoming air stream. The results showed the pump's ability to remove up to 99% of bacteria and dust in the incoming air. The tests proved the air leaving the compressor was actually cleaner than the incoming air.
In vacuum processes, this can cause some complications. For instance, if you carry over sand into the vacuum pump, centrifugal force will sling it to the outside of the pump casing as shown in the diagram at the right. In a year, this sand will go around a 1200-rpm pump 630 million times! Erosion takes place and can cut through the 2" thick cast iron body of the pump.
To solve this, you should install, a unique feature developed by NASH called, a lobe purge. This will remove the solids and prevent erosion. The newer NASH pumps already have tappings for easy lobe-purge connections; others like the CL Series require minor modifications.