I'm just trying to clarify if a pressure vessel to PD5500 requires PWHT. Referring to PD5500 Annex D Fig. D.1, we have a 30mm thick vessel, with a design reference temperature of -40C - but this is not on the graph !
When looking at PD5500 Table 4.5-1 as the vessel is less than 350mm thick (Group 1.1 material, EN 10028-3) this would indicate PWHT is NOT required.
But I'm not sure what to do with Annex D Fig. D.1 graph as this vessel is not on the chart
Any guidance would be appreciated.
Thank you