American Society of Mechanical Engineers (ASME) Practice Exam 2026 - Free ASME Practice Questions and Study Guide

The commonly accepted pressure limit for using cast iron for handhole plates is 250 psi. This value is established based on the material properties of cast iron, which typically has adequate strength and ductility to safely withstand pressure up to this limit. Cast iron is known for its durability and resistance to wear, but as a brittle material, it has limitations when it comes to high-pressure applications.

In practical terms, using cast iron handhole plates at pressures exceeding 250 psi may introduce risks of cracking or failure due to stress concentrations that can occur in the material. Hence, adhering to this limit helps ensure operational safety and reliability in pressure vessel applications.

Understanding this limitation is crucial for engineers and operators in the field, as it guides the selection of appropriate materials for specific pressure ratings in engineering design and compliance with safety standards.