Machinery
Modern diving compressors are three- or four-stage-reciprocating air compressors that are lubricated with high-grade compressor oil (a few use ceramic-lined cylinders with O-rings, not piston rings, requiring no lubrication). Oil-lubricated compressor operators must only use lubricants specified by the compressor's manufacturer. Special filters are used to clean the air of any residual oil (see "Air purity").
The compression process helps remove water from the gas, making it dry, which is good for reducing rust in diving cylinders and freezing of diving regulators, but causes dehydration, a factor in decompression sickness, in divers who breathe the gas.
Read more about this topic: Diving Air Compressor
Famous quotes containing the word machinery:
“Totalitarianism is never content to rule by external means, namely, through the state and a machinery of violence; thanks to its peculiar ideology and the role assigned to it in this apparatus of coercion, totalitarianism has discovered a means of dominating and terrorizing human beings from within.”
—Hannah Arendt (1906–1975)
“There has been something crude and heartless and unfeeling in our haste to succeed and be great. Our thought has been “Let every man look out for himself, let every generation look out for itself,” while we reared giant machinery which made it impossible that any but those who stood at the levers of control should have any chance to look out for themselves.”
—Woodrow Wilson (1856–1924)
“We saw the machinery where murderers are now executed. Seven have been executed. The plan is better than the old one. It is quietly done. Only a few, at the most about thirty or forty, can witness [an execution]. It excites nobody outside of the list permitted to attend. I think the time for capital punishment has passed. I would abolish it. But while it lasts this is the best mode.”
—Rutherford Birchard Hayes (1822–1893)