🔍 Key Concepts

• Fixed CO₂ fire extinguishing systems inspection and testing schedules • Difference between annual inspections and hydrostatic (pressure) testing • USCG / SOLAS requirements for high-pressure gas cylinders

💭 Think About

• Think about how often steel pressure vessels (like SCBA and fire extinguisher cylinders) are usually hydrostatically tested for safety. • Consider that CO₂ cylinders are high-pressure containers—would they be tested as often as portable extinguishers, or on a longer cycle? • Compare the options with what you know about typical hydrostatic test intervals: very frequent, moderate, or relatively long?

✅ Before You Answer

• Distinguish between visual/annual inspections and hydrostatic pressure tests—they are not the same interval. • Recall the typical test cycle used by the U.S. Coast Guard and classification societies for permanently installed high-pressure cylinders. • Eliminate answer choices that sound more like an inspection interval rather than a full pressure (hydrostatic) test interval.