The fuel oil strainers in the fuel oil service system of an automatically fired auxiliary boiler are permitted by the Coast Guard Regulations (46 CFR) to be either the simplex type or the __________.
• Fuel oil service systems for automatically fired auxiliary boilers under 46 CFR • Difference between simplex and duplex strainers in marine fuel systems • Common USCG‑approved fuel oil strainer arrangements used to allow cleaning without shutting down equipment
• Think about which option describes a strainer arrangement (how many and how they are piped) rather than the material or style of the filter element itself. • In continuous boiler operation, what type of strainer setup would let you clean or switch strainers without securing the burner? • Which choice matches what you commonly see on marine fuel oil lines feeding engines and boilers when uninterrupted service is important?
• Verify which choice refers to a piping/valve configuration (not a filter media type). • Ask: which type is specifically mentioned in 46 CFR for fuel oil service strainers as an alternative to simplex? • Eliminate any answers that mainly describe the filter material (what it’s made of) rather than the system arrangement.
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