A validated workflow for the design and certification of below-the-hook lifting devices integrating finite element analysis and physical proof testing

Abstract

This paper presents a comprehensive, standardized workflow for the design, analysis, fabrication, and validation of a 30-ton capacity spreader beam as a case study. The methodology integrates computational engineering with rigorous physical testing to ensure compliance with international safety standards, including ASME BTH-1 and OSHA. The process begins with defining requirements and proceeds through preliminary design, material selection, and detailed Finite Element Analysis (FEA) using Ansys. An iterative approach was employed to optimize the design, transitioning from an initial 6-inch pipe concept to a finalized 8-inch ASTM A106 Grade B pipe main beam with ST37 plate lugs. The optimized design achieved a safety factor exceeding 2.0, with a maximum von Mises stress below 100 MPa. The physical prototype was fabricated under strict quality control, including weld inspection via Liquid Penetrant (PT) and Magnetic Particle Testing (MT). Final validation was achieved through a successful 40-ton (133% of Safe Working Load) proof load test. The beam was subsequently certified for operational use, with recalibration required every six months. This work provides a validated, step-by-step guide for engineers, demonstrating a critical balance between analytical prediction and experimental verification in lifting equipment design.