A proposed new pressure vessel design class

This paper gives the historical background to how these weld efficiencies were developed. The statistical significance of partial volumetric inspection is explored, considering the implications on the safety of the design. The comparative safety of partially volumetrically inspected welds and non-volumetrically inspected welds is challenged. A proposal is made for the introduction of a new design class based on a fabricator nominated weld efficiency and hydrostatic pressure testing to near yield conditions without volumetric inspection. While the paper is not conclusive in its findings, its purpose is to challenge the understanding of weld efficiencies and to encourage new developments.