OPTIMIZING THREAD ENGAGEMENT IN PUMP ASSEMBLIES: A FINITE ELEMENT ANALYSIS APPROACH
Keywords:
Thread Engagement, Pump Assembly, Finite Element Analysis, Pump Barrel-Head Connection, Thread Failure Analysis, Goodman Diagram, Nominal Material Condition, Least Material ConditionAbstract
Thread engagement in pump assemblies is critical in ensuring structural integrity, operational efficiency, and ease of maintenance. However, thread failures, improper engagement, and wear can significantly impact pump performance and reliability, leading to operational downtime and safety risks in critical applications. This study investigates the mechanical implications of reducing thread engagement on pump barrel-head connections within a pump assembly. Specifically, it compares stress distribution and fatigue characteristics between a baseline design (M33X1.5) with six engaged threads and a revised design (M33X1.5 and MJ33X1.5) with five threads. Finite Element Analysis (FEA) was done to evaluate M33X1.5 and MJ33X1.5 thread profiles under nominal (NOM) and least material conditions (LMC). The FEA simulations using ANSYS Mechanical 14.0 analyzed stress distributions and fatigue performance across different loading scenarios. Results indicate that reducing thread engagement from six to five threads increases stresses, particularly at the thread roots, thereby elevating the risk of fatigue failure. The study highlights the effectiveness of optimizing thread geometry, particularly with MJ33X1.5 profiles, in reducing stress and enhancing fatigue resistance. The Goodman diagram analysis confirms that all designs meet safety criteria under cyclic loading conditions, albeit with varying margins. Designs employing MJ series thread profile exhibit superior stress distribution and fatigue performance compared to M series thread profile, emphasizing the importance of thread profile selection in enhancing pump assembly durability. The findings underscore practical implications for pump assembly design and maintenance strategies. Maintaining an adequate number of engaged threads and optimizing thread profiles are crucial for reducing stress and ensuring long-term reliability under operational conditions. While this study provides valuable insights, future research should focus on experimental validation to corroborate FEA findings and explore additional factors, such as dynamic thermal cycles and pressure fluctuations, to assess pump assembly performance comprehensively.
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