Omaha 3rd Grade Stationary Engineering Practice Exam 2026 – Complete Test Prep

The use of cast iron for pressure applications is primarily governed by the material's ability to withstand stress without failure. Cast iron is typically used in applications where the pressure does not exceed 15 psi. At this pressure level, cast iron structures can support the load without significant risk of cracking or failing due to internal stresses.

When the pressure exceeds this limit, the likelihood of mechanical failure increases substantially. This is because cast iron, while strong in compression, is more vulnerable to tensile stress, which can lead to fractures. Therefore, regulations are in place to ensure that cast iron is not used in high-pressure applications, making 15 psi the maximum safe threshold.

In practical terms, engineers and operators need to adhere to these safety guidelines to avoid potential hazards in stationary engineering applications, ensuring that the materials used can safely accommodate the pressures they are subjected to.