🔍 Key Concepts

• Semi-portable vs. portable fire extinguishers on tank vessels • USCG weight thresholds that change an extinguisher’s classification • Where to find this in 46 CFR Subchapter D or I (tank vessel fire protection)

💭 Think About

• First, recall the typical weight range for truly hand-portable extinguishers that one person can easily carry and operate. • Think about why the Coast Guard would define a “semi-portable” class: it’s still movable, but no longer practical as a simple handheld unit. What weight range makes sense for that? • Compare the answer choices and eliminate any that seem too light to require extra mounting or hose, and any that seem so heavy they would normally be considered fixed systems instead.

✅ Before You Answer

• Check the exact weight cutoff in the applicable CFR table for fire extinguishers on tank vessels. • Verify which weight range is explicitly labeled as “semi-portable” rather than “portable” or “fixed”. • Confirm that the gross weight (cylinder + agent + hardware) is what the rule is talking about, not just the weight of the extinguishing agent.