🔍 Key Concepts

• 46 CFR requirements for automatic auxiliary boilers and their safety devices • Purpose of a fuel pressure limit control in preventing unsafe combustion conditions • Difference between automatic restart and manual reset after a safety shutdown

💭 Think About

• For safe combustion, think about whether too little or too much fuel pressure is more likely to cause poor atomization and unsafe burner operation in an automatic boiler. • When a safety device trips (like a fuel pressure limit control), should the system normally restart on its own or should an operator have to intervene? Why? • Consider what the CFR is trying to prevent: Is it more concerned about a brief normal fluctuation, or about a fault that might repeat if the system restarts automatically?

✅ Before You Answer

• Verify in 46 CFR whether safety shutdowns on automatic boilers generally require a manual reset before restart. • Check whether the regulation describes the fuel pressure limit control as responding to low fuel pressure or high fuel pressure for shutdown testing. • Confirm that the correct option matches both the direction of pressure change (raised vs lowered) and the type of restart (automatic vs manual).