1. Steam Boilers - Chapter Objectives .... Page 1/1

Describe the steam boilers used in marine practice, relating various components of these boilers, their functions, the associated boiler mountings and the safety devices.

• Classify marine propulsion boilers and enumerate their characteristic differences.
• Identify the following components in boiler, label the significant parts, and describe the function of the components, their constructional details and operational importance in the steam cycle:

• Water and steam drums
• Tubes
• Headers
• Downcomers & Risers
• Membrane walls
• Refractory
• Furnaces
• Economizers
• Superheaters
• Attemperators
• FD Fans
• Air preheaters
• Boiler mountings
• Safety devices
• Soot blowers

• Describe the principles involved in boiler automation and control system and enumerate the functions and working of following sub systems:

• Overall steam load-based control for boiler
• Combustion and draft control
• Feed water and level control
• Steam temperature control
• Fuel oil & fuel gas control

• Explain the needs for boiler & feed water treatment.

• Describe the types of boiler & feed water treatment undertaken on board.
• Relate the test carried out to ascertain the condition of boiler water.
• Explain the purpose of blow down and distinguish the difference between surface blow down and bottom blow down.
• Enumerate the problems which could be encountered if the boiler water treatment is not monitored and dosed.