... ring compressor.These sturdy pumps are built for heavy duty,wet and humid applications where most other pumps' performance will ... the highest demands.Extreme conditions, which prevail in humid and wet processes, lead to lime scale or abrasion, and hence ... :1,Asphalt-thickening machines(steamrollers)2,Corrosion protection for water pipes3,Drying systems4,Dust extraction in the mining industry5, ...