Natural gas transmission pipelines are far more susceptible to external corrosive attack than similar operating oil pipelines. To explain the difference, it is proposed that the internal liquid content of the natural gas transmission pipeline may actually promote corrosive chemical reactions on the outside steel surface of the pipeline.
Natural gas pipelines often contain liquids that can interfere with the proper operation of pipeline related equipment such as compressors, regulators, meters, and processing equipment. These liquid contaminants normally include hydrocarbon condensate, lubricating oils, glycols, water, and other chemicals used in the treatment, dehydration or compression of natural gas.
Canadian gas-plant tests of a new design for in-line gas pipeline liquid separators (“drips”) have shown that efficiency of free liquid separation in a pipeline can be increased by a factor of close to ten. The newly developed drip also allows passage of pipeline inspection gauges (PIG) while working at higher separation efficiency. Drips are commonly used to separate free liquid in natural gas transmission pipelines. A limitation of available current drips is that, in order to allow free passage of pipeline inspection and cleaning pigs, the drips are not designed to reduce the velocity of the gas as in scrubbers or separators.
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