David Thornton, P.E., Principal Engineer and Technical Advisor, Equity Engineering Group, has over 35 years of experience as a specialist in pressure vessel, piping, and tank design/analysis. He has worked both as an owner-user, and a consultant, providing engineering support to refineries and chemical plants worldwide. Currently with the Equity Engineering Group, his work has included mechanical engineering quality control for a $500 million clean fuels expansion of a Middle East refinery, FFS evaluations, Fracture mechanics evaluations, High Temperature Creep Analysis and Life Assessment, Fatigue, Structural Reliability, and Risk Assessment, etc. He is also responsible for training engineers and inspectors in API Fitness-For-Service API 579-1/ASME FFS-1, Pressure Vessel Design, and Piping Design and Analysis. Mr. Thornton serves as a member of the joint API/ASME technical committee responsible for the development of FFS assessment techniques. He earned his Bachelor’s degree in Civil Engineering at Drexel University, Philadelphia, PA in 1975, and his Master’s degree in Theoretical and Applied Mechanics at Cornell University, Ithaca, NY in 1980. Mr. Thornton is a licensed professional engineer in a number of states. J. Ryan Jones, P.E., is a consultant and Director of the Mechanical Engineering Business Unit at The Equity Engineering Group, Inc. and has over 15 years of experience in the petrochemical and refining industries. Mr. Jones brings a depth of experience covering the full project life-cycle including design/procurement activities, construction/commissioning activities, plant maintenance activities, and failure analysis/ Fitness-For-Service/ decommissioning activities in petrochemical environments. Mr. Jones uses advanced engineering principles and analysis tools to solve design or operational problems in the most practical, cost-effective manner. Mr. Jones is a member of the ASME Post Construction Code Committee for Repair of Pressure Equipment and Piping (ASME PCC-2). Mr. Jones earned his Bachelor Degree in Mechanical Engineering at The University of British Columbia, Canada. He is a registered professional engineer in a number of Canadian Provinces. David A. Osage, P.E., is internationally recognized for his expertise in the design of new equipment and as an industry expert and leader in the development and use of FFS (Fitness-for-Service) technology. He is the President and CEO of The Equity Engineering Group, Inc., and has over 30 years of experience in the refining and petrochemical industries. As the lead investigator and principal author of the new ASME B&PV Code, Section VIII, Division 2, Rules for Construction of Pressure Vessels: Alternative Rules, he developed a new organization and writing style for this code and was responsible for introducing the latest developments in materials, design, fabrication, and inspection technologies. These technologies include new models for materials behavior suitable for use in a construction code, updated design-by-rule methods, modern design-by-analysis procedures including the introduction of elastic-plastic analysis methods, and a new fatigue method for welded joints. Mr. Osage received a Certificate of Acclamation from ASME for this work. He has served on several ASME B&PV VIII Code Committees. Mr. Osage earned his Bachelor and Master’s degrees in Mechanical Engineering from the Stevens Institute of Technology in 1977. He is a registered professional engineer in Ohio.