Damaging of Steel-Oil Pipes by Erosion and  Erosion -Corrosion Phenomena

MS.C.Mohammed Abdullateef Ahmed, Asst.lecturer; Prof. Dr. Sami Abulnoun Ajeel, Asst.

	Damaging of Steel-Oil Pipes by Erosion and Erosion -Corrosion Phenomena
Iraqi journal of mechanical and material engineering
Article 1, Volume 10, Issue 1, 2010, Pages 97-107
Authors
Asst.lecturer MS.C.Mohammed Abdullateef Ahmed; Asst. Prof. Dr. Sami Abulnoun Ajeel
Abstract
Erosion and erosion-corrosion have important role in oil fields especially in steel oil pipelines. Therefore; in the present work erosion and erosion-corrosion tests are studied individually to investigate the relation between erosion and erosion-corrosion processes and to quantify the synergy (that is caused by erosion) in realistic flow environments. The experimental work tests were done using special device which was designed and manufactured according to (G 73) ASTM. The experimental work tests were achieved using traditional weight loss technique to measure weight loss rates in (gmd) unit. Also the microstructure observations of the test specimens were studied. It was observed that whole tests were conducted on oil pipe (X 60) made of low carbon steel in plate form, tests were made on corrosion using 3.5 wt % sodium chloride. (NaCl) solution as sea water purged with CO2 gas as the corrosive medium in crude oil , but in erosion-corrosion 1 wt % silica sand was added as slurry to that medium, pure erosion using 1 wt % silica sand as the erodent in distilled water purged with N2 gas as anti corrosive medium to get erosion just during pure erosion , all tests above were done in pumped media and pumped media had constant pressure of 1 bar, flow rate Q = 36 L/min, temperature ≈ 25 ºC and pH = 4.4 for erosive-corrosive media but pH = 7.4 for erosive medium. After traditional weight loss technique was achieved, it was found that erosion rate (E.R) was smaller than that of erosion-corrosion rate(E-C.R)

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