Experimental Investigation of the Effects of Different Environmental Conditions on Pipelines Corrosion Rates
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Date
2019-08-03
Authors
Adeyanju, O.
Oyekunle, L.
Journal Title
Journal ISSN
Volume Title
Publisher
Society of Petroleum Engineers
Abstract
An estimate of about $18.5 million are expended by industries in Nigeria yearly on corrosion, the oil and gas
industry takes more than 65% of this cost due to the peculiar nature of their facilities and operational conditions. In
spite of the use of galvanized pipeline and application of the anti-corrosion coating of crude oil pipeline and other
metallic structure in the oil and gas industry, corrosion failures are still daily occurrences. These corrosive failures
have been attributed to the environmental conditions in which the pipeline and other metallic structures are
located. This research studies the rate of deterioration (corrosion rate) of carbon steel pipeline (flow pipe) under
five different environmental conditions, coated with different anti-corroding agents, and subjected to different
temperatures and pH values. Five Different environmental conditions through which pipelines are laid (Top soil +
Fresh water, Sea water bed sand + Sea water, Lagoon water, Seawater, NaCl solution (0.5M)) were simulated in
the laboratory. Different seventy gram (70g) samples of the carbon steel pipeline were used as the coupon
samples. Red oxide oil paint and tar paint were used as the anti-corroding agents. Water bath was used in
regulating the temperature and different concentration of HCL and NaOH were used to vary the pH. Weight loss
method was used to calculate the corrosion rates.
Results show that carbon steel resists corrosion better when buried in soil than when submerged in water; also
the corrosion rate is more in sea water than in the lagoon water of relatively smaller salinity. The rate of corrosion was observed to increase with: increase in temperature, increase in salinity, and increases in acidity and alkalinity.
Also the tar paint is more effective as anti-corrodant than the red oxide oil paint when applied to the carbon steel
pipeline under same environment conditions. The study successively reduced the corrosion rate of the 70g
coupon sample from 0.00127g/day when the sample were suspended in 0.5M, NaCl solution to 0.000104g/day
when pipeline coated with tar paint are buried in dry soil.
Description
Staff publications
Keywords
Research Subject Categories::TECHNOLOGY , Corrosion rate , Weight loss method , Anti-corrodant , Tar paint , Saline environment
Citation
Adeyanju, O.A. and Oyekunle, L.O. (2019). Experimental Investigation of the Effects of Different Environmental Conditions on Pipelines Corrosion Rates.