Research Papers: Materials and Fabrication

Crude Oil Corrosion Fatigue of L485MB Pipeline Steel

[+] Author and Article Information
Ľ. Gajdoš

Academy of Sciences of the Czech Republic,
Institute of Theoretical and Applied Mechanics,
Prosecká 76,
Prague 9 19000, Czech Republic
e-mail: gajdos@itam.cas.cz

M. Šperl

Academy of Sciences of the Czech Republic,
Institute of Theoretical and Applied Mechanics,
Prosecká 76,
Prague 9 19000, Czech Republic
e-mail: sperl@itam.cas.cz

J. Bystrianský

Institute of Chemical Technology,
Technická 5,
Prague 6 19000, Czech Republic
e-mail: jaroslav.bystriansky@gmail.com

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 9, 2014; final manuscript received January 19, 2015; published online February 24, 2015. Assoc. Editor: Marina Ruggles-Wrenn.

J. Pressure Vessel Technol 137(5), 051401 (Oct 01, 2015) (7 pages) Paper No: PVT-14-1162; doi: 10.1115/1.4029659 History: Received October 09, 2014; Revised January 19, 2015; Online February 24, 2015

An investigation was made into the fatigue properties of L485MB (X70) pipeline steel after 13 yr of exploitation as a crude oil pipeline material. Fatigue tests in zero-to-tension loading were carried out (i) in air, (ii) in crude oil, (iii) in a mixture of crude oil with rainwater, and (iv) in water separated from the crude oil phase. The aim of the investigation was to assess the degree of degradation of the fatigue properties of this steel due to the action of environments typical for crude oil processing and transport. The results are not directly comparable to any corrosion fatigue experienced by the crude oil pipeline, since the strain rate for the tests was higher by an order of five than the strain rate observed in typical loading cycles. The results showed that crude oil and a mixture of crude oil with rainwater had no aggressive effect on the steel in the sense of reducing its fatigue characteristics, while the separated water had an aggressive effect.

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Fig. 1

Microstructure of the steel in the transverse direction

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Fig. 2

Fatigue specimens of varying width (dimensions in mm)

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Fig. 3

A longitudinal section of the sealing cell (specimens of varying width were used in the experiments)

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Fig. 4

View of a specimen in the sealing cell in the grips of the fatigue machine

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Fig. 5

Fatigue specimens after failure in air (top), in oil (second from top), in a mixture of oil with rainwater (second from bottom), and in separated water (bottom)

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Fig. 6

An aggregate representation of the fatigue test results

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Fig. 7

A comparison of the S–N curves for L485MB steel in the tested environments

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Fig. 8

Dependence of the FSRF kf on life Nf




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