🔍 Key Concepts

• 46 CFR requirements for boiler water level indicators on auxiliary and main boilers • How water columns, gage glasses, and test cocks may be arranged to satisfy the primary water level indication requirement • Material and minimum size requirements for boiler external piping and valves

💭 Think About

• Look at the illustration and decide whether the Magnetrol arrangement is meant to be the only water level indicator, or part of a system that also includes a gage glass or test cocks • Compare each choice with what 46 CFR actually says about pressure limits, pipe sizes, valve materials, and the use of test cocks in place of a gage glass • Ask yourself which option sounds like a very specific regulatory requirement you might see word‑for‑word in the CFR, rather than a broad or loosely worded claim

✅ Before You Answer

• Verify in 46 CFR what the minimum pipe size must be between the drum and the water column for boilers in this pressure range • Check whether cast‑iron is permitted for any shutoff or stop valves directly connected to the boiler drum at these pressures • Confirm the exact wording in 46 CFR on when three test cocks may or may not be accepted as the primary water level indicator, and whether this is tied to a specific pressure limit