In assessing risks of standard sulfide stress cracking (SSC) of low alloy steels under field
conditions, the environmental effects in fitness-for-purpose (FFP) testing has focused on the H2S partial
pressure, pH, and temperature. To gain information on additional variables, the literature has been
reviewed and new test methods developed. Conclusions are presented on the effect of a number of
variables, including (1) reduced H2S at high CH4 pressure, (2) flow, (3) solution composition, including
the effect of CO2. The focus is the link between corrosion reactions and the resulting level of absorbed
hydrogen. Reasons for the lack or correlation between NACE method A tensile tests and fracture
mechanics tests with DCB specimens are presented. Laboratory environments are contrasted with the
very different environmental conditions of a condensing water phase that occurs following a
tubing/connection/packer failure.