Thanks for that, but these are the standard sizing type articles, interesting but not quite what I was looking for. The articles I was looking for were specifically:

1. How to Size Relief Valves - Asu Mukerji, Chemical Engineering June 2nd, 1980
2. Relief Line Sizing for Gases (Part 1) - H. A. Duxbury, The Chemical Engineer, November 1979
3. Relief Line Sizing for Gases (Part 2) (Appendix) - H. A. Duxbury, The Chemical Engineer, December 1979

They covered some more practical considerations and some rather interesting insights into more unusual relief scenarios