The performance of the pipeline in the corrosive environment changes

Pipeline in the corrosive environment changes in petrochemical industry, the performance of pipeline media such as ships, offshore oil platform, a lot of corrosive, in fact, the dangers of metal corrosion is very common, but also is very serious, the corrosion cause direct or indirect losses. Metal, for example, the stress corrosion and corrosion fatigue and corrosion tend to major catastrophic accident, and the metal corrosion will cause a lot of metal consumption, waste lots of resources. Basically has the following several kinds of corrosion medium. 1) chloride and chloride corrosion of carbon steel pipe is basically uniform corrosion, and accompanied by hydrogen embrittlement, corrosion of stainless steel is pitting corrosion and intercrystalline corrosion. Prevention measures can choose appropriate materials, such as the use of carbon steel and stainless steel composite pipe. As many as 250 (2) sulfide sulfur in crude oil, on the metal corrosion of coating steel pipe hydrogen sulfide (H2S), mercaptan (R - SH), sulfide (R - S - R), etc. High H2S content in the liquefied petroleum gas in our country, causing cracks in container, some production of the 87 days that happen through cracks and later by the magnetic particle inspection, inner surface circumferential weld crack, 417 ball in vitro surface crack, so the high content of H2S stress corrosion caused by deserve attention. Japan

Welding society and high pressure gas safety association rules: H2S content in the liquefied oil should be controlled under 100 x 10-6, but our country liquefied petroleum gas H2S content in an average of 2392 x 10-6, Japan more than 20 times higher. (3) naphthenic acid naphthenic acid is of organic compounds in crude oil, when the temperature exceeds 220 ℃, began to occur corrosion, 270 ~ 280 ℃ maximum corrosion; When the temperature exceeds 400 ℃, the naphthenic acid in crude oil has finished vaporization. Stainless steel 316 l (00 cr17ni14mo2) is an effective material for naphthenic acid corrosion resistance, they can be used for high temperature naphthenic acid corrosion environment.

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