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:
“Every Age has its own peculiar faith.... Any attempt to translate into facts the mission of one Age with the machinery of another, can only end in an indefinite series of abortive efforts. Defeated by the utter want of proportion between the means and the end, such attempts might produce martyrs, but never lead to victory.”
—Giuseppe Mazzini (1805–1872)
“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)
“angelheaded hipsters burning for the ancient heavenly connection to
the starry dynamo in the machinery of night,”
—Allen Ginsberg (b. 1926)