Browse Issue Articles in this Issue "It is better to be safe 100 times than dead once."-Mark Twain Analysis of spring operated pressure relief valve proof test data: Findings and implications Chemical safety board investigation reports and the hierarchy of controls: Round 2 Consequence assessment of anhydrous ammonia release using CFD - probit analysis Corrosion of sedimentary liquids on internal bottom plate of tanks among coal liquefaction process Corrosion under insulation revisited: Aren't we about to finish that project? Don't walk the line-dance it! Editorial December 2018 Instructions to Authors Issue Information - TOC Know Your Limits Our Process Safety Journey Continues: Operational Discipline Today Probability and Frequency Derivation Using Dynamic Fault Trees Safeguards: A key process safety tool in jet fuel management from refinery to aircraft wings Safety & Health News The "Other Women in Process Safety" Tributes Received in Honor of M. Sam Mannan ZABU 1: An Adventure in Accident Investigation By Jack O.Philley, Blurb Publishing, Katy, TX, 244 pages, $16.49 (softcover), ISBN: 9781389026904