In accordance with 46 CFR 61, what is the interval in years between when boiler drum safety valves must be tested on a fire-tube boiler operating at less than 150 psig as witnessed by a marine inspector?
• 46 CFR Part 61 – Periodic Tests and Inspections of Machinery • Differences in test intervals for fire-tube vs. water-tube boilers • Specific wording in the regulation about safety valve tests witnessed by a marine inspector
• Locate the exact section in 46 CFR Part 61 that covers boiler safety valves and note any distinctions based on boiler type and pressure range • Compare the required interval for safety valve tests on fire‑tube boilers under 150 psig with intervals for other boiler types or higher pressures • Ask yourself whether the regulation uses a simple whole‑year interval or a less common fraction, and why that might be
• Verify you are in 46 CFR 61.05 (or related boiler test/inspection sections), not another part of the CFR • Confirm the text specifically refers to fire‑tube boilers operating at less than 150 psig and not all boilers in general • Double‑check the stated interval in years for tests witnessed by a marine inspector, and that you are not confusing it with the interval for other boiler inspections or internal examinations
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