WRC local load analysis method is based off of analytical and experimental data and is only applicable for certain specific range of the ratios of the geometric parameters of the vessel eg. vessel wall thickness, nozzle thickness, nozzle diameter and vessel diameter. Whenever these ratio ranges are exceeded the WRC method is no longer valid and AutoPIPE Vessel issues an error message (eg. error code 52) and user may select another method of analysis available in AutoPIPE Vessel eg. PD 5500, EN or GOST.However, similar to WRC, these methods also impose limitations on critical geometrical parameter ratios hence in case where all these local load options are invalid, the user may use other methods eg. Finite Element Analysis to perform the analysis.