🔍 Key Concepts

• 46 CFR Subchapter F requirements for inspection intervals of pressure vessels • Meaning of a pressure vessel being listed on the Certificate of Inspection (COI) • Differences in how air, hydraulic, and refrigeration receivers are treated under marine engineering rules

💭 Think About

• Look at which of these items is clearly defined and regulated as a pressure vessel in 46 CFR Subchapter F, not just as part of a system • Think about which of these tanks, if it failed, would present the greatest stored-energy hazard and therefore justify a longer-period internal inspection (as opposed to only external checks) • Consider whether all pressure vessels on the COI have the same inspection interval, or whether some systems are treated more like piping/components than stand‑alone pressure vessels

✅ Before You Answer

• Verify in 46 CFR Subchapter F which types of pressure vessels are explicitly called out with a 5‑year internal inspection interval when the vessel is on an annually inspected ship • Confirm whether hydraulic accumulators and heat exchangers are treated the same way as air receivers or refrigeration receivers under the regulations • Check the wording in the regs for any distinction between air receivers and other system components in terms of required inspection frequency