The carbon dioxide cylinders of all fixed fire extinguishing systems shall be retested and remarked whenever a cylinder remains in place on a vessel for __________. (small passenger vessel regulations)
• 46 CFR Subchapter T requirements for small passenger vessels • Hydrostatic test intervals for CO₂ cylinders in fixed fire extinguishing systems • Difference between inspection intervals and retest/remark intervals
• Look up the specific CFR section that addresses maintenance and hydrostatic testing of CO₂ cylinders on small passenger vessels—what number of years is explicitly stated? • Consider how often CO₂ cylinders must undergo hydrostatic testing compared with portable extinguishers—are fixed system cylinders usually tested more or less frequently? • Think about why the Coast Guard sets this time limit: what happens to cylinder integrity over time, and does that argue for a shorter or longer interval?
• Verify the exact year interval stated in 46 CFR for CO₂ cylinder retest and remark when the cylinder remains on board • Confirm that you are looking at fixed CO₂ systems (not portable extinguishers or other gas types) • Make sure the time is measured from the latest test date stamped on the cylinder, not from installation or vessel inspection dates
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