🔍 Key Concepts

• Fuel oil service system components on marine auxiliary boilers • Difference between duplex and simplex strainers in piping systems • Common vs. uncommon strainer types actually used in shipboard fuel systems

💭 Think About

• Ask yourself: if one side of a duplex strainer can be taken out of service for cleaning while the other stays in operation, what is the basic, simpler arrangement called when there is only one housing? • Which of these choices (bag, Perry, simplex, absorbent) is a standard classification used in piping/strainer diagrams on marine fuel systems? • Consider what the purpose of a fuel oil strainer is—does it usually absorb fuel, filter with disposable bags, or pass it through a single or dual screen?

✅ Before You Answer

• Verify which type is routinely shown on fuel oil service system schematics for boilers (look for "___ strainer") • Eliminate any option that sounds more like a consumable filter medium rather than a standard, hard-piped marine strainer body type • Confirm that the correct choice is the one that is a basic, single-chamber counterpart to a duplex strainer