AMSE P-1, Guidelines for Pressure Boundary Bolted Flange Joint Assembly, is a MUST have (and read) for process safety professionals managing piping systems that have bolted flanged joints. In fact, Chapter 15, JOINT DISASSEMBLY, has some specific requirements that a facility should adopt as part of its Line Break SWP for flanged joints.
HINT: the old trick of the first nut loosened being down and away from the worker is no longer a “trick” it has become part of the RAGAGEP
(emphasis by me)