Socrates 8.0
also assists you in determining the viability of carbon steels
versus CRAs through a rigorous evaluation of general corrosion
susceptibility of steels with or without inhibition in the operating
environment. The system determines a steel corrosion severity
index, a measure of the overall corrosive severity of the environment.
The steel corrosivity index is a synergistic parameter that combines
the effect of different variables that influence corrosion rate
in steels listed further below in this section. The corrosion
severity index represents the corrosion rate in carbon steels
in mpy (See Appendix II for more
information about steel evaluation in Socrates).
In material
selection, it should be realized that conventional steels can
be significantly more economical than CRAs in low severity environments
or in greater severity environments when used with proper chemical
inhibition. Therefore, before considering CRAs, it is important
to first evaluate whether steels can be used in oil field environments
without being susceptible to sulfide stress cracking. Relevant
parameters in steel evaluation include:
