INVETIGATION OF THE CORROSION OF COLLECTION PIPE OF DEHYDRATED NATURAL GAS TRANSPORT

J Chin Soc Corr Pro

2000, Vol. 20

Issue (6): 374-378 DOI:

Failure Analysis

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INVETIGATION OF THE CORROSION OF COLLECTION PIPE OF DEHYDRATED NATURAL GAS TRANSPORT

Liewei Liu;;;

华中科技大学化学系

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Abstract New processes of dehydration with triglycol are applied in the transport of natural gas in Sichuan-east Datianchi oil/gas field.Accidents of cracking and perforation still occurred in the collection pipe of natural gas transport. The spot loss-sample and corrosion product collected form the pipe were analzed with X-ray diffraction, electron probe microscopy analysis (EPMA),scanning electron microscope and thermal analysis. The analysis results show that the collection pipe of natural gas transport suffered severe hydrogen sulfide corrosion though new processes of dehydration had been introduced. The pattern of corrosion showed fron loss-sample was pitting corrosion. The composed of FeS, FeS2, Fe3S4,and Fe9S8, some ferrous oxide composition and something else.Thermal analysis of corrosion product sample shows that a strong exothernic reaction exists between 170℃ to 350℃, the enthalpy value(△H) is about -256.8J/g.

Key words: dehydration corrosion product hydrogen sulfide scanning electron probe thermal amalysis

Received: 20 September 1999

ZTFLH:

TG172.9

Corresponding Authors: Liewei Liu

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Cite this article:

Liewei Liu. INVETIGATION OF THE CORROSION OF COLLECTION PIPE OF DEHYDRATED NATURAL GAS TRANSPORT. J Chin Soc Corr Pro, 2000, 20(6): 374-378 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2000/V20/I6/374

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