🔍 Key Concepts

• 46 CFR 61 boiler inspection intervals and how often internal inspections are required • How many inspections fit into a 5-year period if the base interval is 2.5 years • What "no more than X years can elapse between any test or inspection and its immediate predecessor" means in terms of maximum spacing between dates

💭 Think About

• If the required interval is 2.5 years, how many times would you expect the boiler to be inspected over a 5‑year span? Sketch a simple time line (Year 0 to Year 5) and mark off 2.5‑year intervals. • Compare each choice’s number of tests in 5 years to what you get from your time line. Then check whether the maximum allowed gap in that choice is consistent with a 2.5‑year interval. • Ask yourself: If the regulation says 2.5 years, can the time between any two consecutive inspections be longer, shorter, or must it be no more than 2.5 years?

✅ Before You Answer

• Verify in 46 CFR 61 how the 2.5‑year interval is defined: is it a maximum time between inspections? • Check which options have a maximum gap that is greater than 2.5 years—those would conflict with a 2.5‑year required interval. • Confirm whether having more frequent inspections (shorter gaps than 2.5 years) could still satisfy a 2.5‑year requirement, and whether that affects the correct number of tests over 5 years.