🔍 Key Concepts

• Circulating pump role in moving water through the generating tube coils and combustion chamber • Feed pump connection between the hotwell and the steam separator, controlled by level controller (LC) • Difference between pumps that must run continuously to protect equipment and pumps that can be level-controlled/intermittent

💭 Think About

• Trace the path of water from the hotwell through the feed pump to the steam separator. What activates or stops this pump according to the illustration? • Look at the water/steam path through the generating tube coils and back to the separator. Would stopping this circulation while firing be safe for the heating plant? Why or why not? • Which pump is clearly tied to a level controller (LC) and which one is simply in the main flow path with no on/off control shown?

✅ Before You Answer

• Identify which pump is associated with the level controller (LC) signal and therefore can cycle on and off with water level changes. • Confirm which pump is in the primary circulation loop through the hot section (generating tube coils/combustion chamber) and consider whether it must run at all times when the plant is in operation. • Make sure you distinguish between feedwater supply to the separator and circulation of water through the heater/boiler coils before choosing an option.