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Boiler tube failures occur in steam generation boilers due to subcritical Short Term Overheating (STO). In general, sub-critical STO occurs when design parameters are often marginally and critically discounted. This leads to frequent failures of the boiler tubes that affect the sustainability of power generation. A commercial Computational Fluid Dynamics (CFD) software, ANSYS Fluent 19.0®(Multiphase flow), was used to successfully analyze the locations where the phase boundary of energy transfer on the tube material occurs. A number of heat transfer velocity parameter changes were numerically analyzed to determine the integrity operating window in which the tube could perform, with further analysis done to predict the useful life when operating in this sub-critical STO zone. Numerical analysis is limited to a horizontal carbon steel water tube of 36.6 mm ID operating at 17.6 MPa with a uniform heat flux.