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51313-02493-Fatigue Crack Growth Performance of a Pipeline Steel in H2S Gas

Picture for Fatigue Crack Growth Performance of a Pipeline Steel in H2S Gas
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Product Number: 51313-02493-SG
ISBN: 02493 2013 CP
Author: Colum Holtam
Publication Date: 2013
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Oil and gas fields can contain significant amounts of hydrogen sulphide (H2S). The fatigue resistance of C-Mn pipeline steels exposed to sour environments (i.e. those containing H2S and water) is significantly degraded in comparison with the performance in air; the endurance limit is lower and the fatigue crack growth rate (FCGR) is higher. However in the absence of moisture H2S gas is generally considered to be an inert environment and in-air performance can be assumed. Considering the paucity of published data the basis for this assumption is unclear.

This paper explores the FCG behaviour of API 5L X65 pipeline steel parent material. FCGR tests have been conducted in H2S gas under conditions of increasing applied stress intensity factor range (DK). The results suggest that FCGRs are significantly higher than those observed in air. These data also provide a useful comparison with similar tests performed in wet H2S environments and gaseous hydrogen. The underlying mechanism responsible for the observed behaviour which is not well understood is also investigated.
 

Oil and gas fields can contain significant amounts of hydrogen sulphide (H2S). The fatigue resistance of C-Mn pipeline steels exposed to sour environments (i.e. those containing H2S and water) is significantly degraded in comparison with the performance in air; the endurance limit is lower and the fatigue crack growth rate (FCGR) is higher. However in the absence of moisture H2S gas is generally considered to be an inert environment and in-air performance can be assumed. Considering the paucity of published data the basis for this assumption is unclear.

This paper explores the FCG behaviour of API 5L X65 pipeline steel parent material. FCGR tests have been conducted in H2S gas under conditions of increasing applied stress intensity factor range (DK). The results suggest that FCGRs are significantly higher than those observed in air. These data also provide a useful comparison with similar tests performed in wet H2S environments and gaseous hydrogen. The underlying mechanism responsible for the observed behaviour which is not well understood is also investigated.
 

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