Hey Lawrence,
What edition of D1.1 was the change from "E" (effective throat) to "S" (weld size")? - speaking generally, not to this particular situation. When I took my CWI exam, this was the way these letters were designated in the weld symbols....I know it has since changed. It trips me up now when looking at PJPs and I have to grab my A2.4 to refresh my memory because it reverts back to the old way of designating weld sizes/depth of prep/effective throat...etc