McCoy et al. (see references) reported the following lessons learned from the event:There are two general lessons to be learned from thisincident. These are lessons that have been learned beforeand unfortunately, will probably have to be learnedagain. They are:1. Small design modifications executed to solve an immediate problem, can compromise the basic safety design of a whole process equipment. Sometimes, as in this case, several suchchanges have an additive effect. 2. Operating procedures must aim in first instance at protecting people and equipment,and only secondarily at protecting the catalysts.At many years from this event, a more generic historical view can be concluded. Pigtails are a weak components of a reformer, and have initiated repeatedly similar accidents. However, improvement based on their whole lifetime, from material selections and metallurgy (micro-structure) to cycling behaviour up to inspections, have reduced significantly their negative effects on the reformer operation, as reported by the second article of 2014 among the references.