Jiaxing screw air compressor commissioning

If you’ve been in the compressed air business long enough, you’ve heard the following contradictory statements about the same project – usually given after start-up and a difficult customer call: Service ma. [pdf]

Rotary drilling rig process

A rotary drilling rig works by rotating a drill string, which applies downward pressure to a drill bit that grinds the earth. Drilling fluid or air is pumped down the drill string to cool the bit, carry cuttings to the surface, and stabilize the borehole. [pdf]