Sludge 02
Sludge 02 : (a) Acid sludge. Material of high specific gravity formed during the chemical refining treatment of oils by sulphuric acid, and usually separable by settling or centrifuging. Also known as Acid Tar. (b) Engine sludge. The insoluble degradation product of lubricating oils and/or fuels, formed during their use in internal combustion engines and deposited from the oil on to engine parts outside the combustion space. Water may or may not be present in such material. (c) Tank sludge. Material which collects at the bottom of storage tanks containing crude oils, residues, or other petroleum products. Such sludge usually contains water. See: B. S. and W
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