Session: DA-01-01 The Roger F. Reedy Memorial Symposium on Design & Analysis of Pressure Vessels and Components - 1

Paper Number: 105906

105906 - An Introduction to Asd and Lrfd and Its Application to Pressure Vessels and Piping 

This paper is an introduction to Allowable Stress Design, Allowable Strength Design (ASD) and Load and Resistance Factored Design (LRFD) and its application to pressure equipment.  Many new and experienced mechanical engineers have little to no previous exposure to LRFD which can result in misunderstandings between the mechanical and structural engineers.  It is important to have knowledge of the different methods and understand the proper application of the loads and load combinations.  An improper application can lead to a conservative or unconservative design.  This paper will attempt to provide the reader with an understanding of the difference between the methods and how to properly approach and apply each method.  The design methodologies, loads, load combinations and associated factors will be discussed and how they should be applied to the design of pressure vessels and piping.  Some history regarding the Specification for Structural Steel Buildings (AISC 360) will be provided noting how changes in the specification over the years have influenced the design codes for pressure vessels and piping.  Additionally, some background will be presented regarding the load combinations and loads provided by different versions of the Minimum Design Loads and Associated Criteria for Buildings and Other Structures, otherwise known as ASCE-7.  Lastly, ASD, LRFD and serviceability examples will be provided.

Presenting Author: Kenneth Kirkpatrick Fluor, Inc.

Presenting Author Biography: Kenneth Kirkpatrick is a Fluor Fellow and Technical Director based out of the Fluor Houston office. Kenneth is currently a Fluor SME and is a 25 year member of the Mechanical Analysis Support Team (MAST) at Fluor. Kenneth received his Bachelor of Science in Mechanical Engineering from the University of Houston and is currently a Professional Engineer in the state of Texas and Louisiana.

From 1988 – 1996 Kenneth worked in the oilfield industry. Kenneth worked in the drilling mud labs and provided product support for the downhole chemical injection and downhole pressure monitoring tools. While in the upstream industry, Kenneth was responsible for tracking fabrication and modifying equipment to meet the customer’s needs.

At Fluor, Kenneth’s primary experience is in ASME Section VIII pressure vessels including all aspects of design, fabrication and construction. Kenneth more than 25 years of problem-solving experience providing a multi-disciplinary approach and solving complex problems in a timely fashion.

Kenneth’s analytical experience includes fatigue, vibration, modal analysis, transient conditions, structural analysis of internals, structural analysis of vessel components, vessel rigging, vessel rigging, etc. Solutions include the implementation of the latest codes including ASME Section VIII Division 1, ASME Section VIII Division 2, API-579, AISC ASD, AISC LFRF, ASCE-7 and BTH-1. Kenneth utilizes classical engineering and advanced technologies to solve daily design, fabrication, construction and field problems.

Authors:

Kenneth Kirkpatrick Fluor, Inc.
Barry Millet Fluor, Inc.
Bryan Mosher Fluor, Inc.
Eric Wey Fluor, Inc.
Felipe Mejia Fluor, Inc.