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The reasons of initiation and development of local corrosion attack which is the most hazardous form of destruction of thin-walled tubes in level transmitters at oil processing units are examined. The protective effect of oil-based preservation materials with respect to nickel and copper-nickel alloys in hydrocarbon media containing chlorides and sulfur compounds has been studied. Laboratory studies and industrial tests have shown that the highest protective effect is provided by M-1 inhibitor at 5 mass% concentration in PES-5 silicone oil. The formulation is successfully used for the protection of torque tubes in liquid level transmitters at primary and secondary oil processing units.

international journal of corrosion and scale inhibition

Selection of inhibited preservative materials for corrosion protection of gage parts (level transmitter torque tubes in primary and secondary oil processing units) and experience in application of such materials