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Picture for Long-Term Performance of a Subsea Wet Insulation Material at 180 °C Continuous Operation Temperature
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Long-Term Performance of a Subsea Wet Insulation Material at 180 °C Continuous Operation Temperature

Product Number: 51321-16210-SG
Author: Eileen Wan/Espen Ommundsen
Publication Date: 2021
$20.00
Picture for Low Temperature Effect on Sulfide Stress Crack Initiation in Low Alloy Steels
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Low Temperature Effect on Sulfide Stress Crack Initiation in Low Alloy Steels

Product Number: 51319-12856-SG
Author: Brian Chambers
Publication Date: 2019
$20.00

Exposure temperature has a known effect on sulfide stress cracking (SSC) where elevated temperatures permit the use of oil country tubular goods (OCTG) in sour conditions that would not be survivable at lower temperatures. In order to assess SSC susceptibility NACE MR0175 / ISO15156-2 and API 5CT advise or require the use of room temperature NACE exposure tests in H2S-containing brines and consequently the bulk of qualification data on OCTG has been obtained at these conditions. Previous publications have demonstrated the effect of lower temperatures e.g. 40°F testing on KISSC values of low alloy steel using double cantilever beam (DCB) tests showing a reduction on sour toughness when the temperature is lowered from 75°F to 40°F. This KISSC data provides a clear indication of SSC severity at 40°F on crack propagation; however very little data is available pertinent to crack initiation at temperatures lower than 75°F.In this work several crack initiation tests were performed in mild sour conditions and demonstrated that at low temperature crack initiation susceptibility is increased. Details of the results are discussed within the context of traditional SSC qualification tests and materials selection standards along with the theoretical understanding of SSC fundamentals. Cracking tendency and time-to-failure are reviewed within the context of environmental and material parameters that are altered by the exposure temperature including hydrogen diffusion corrosion rate dissolved H2S concentration and the behavior of hydrogen traps.