| A | B |
|---|
| 108.1 State the type and location of the boilers onboard. | 2 D type 600 psi with the superheater outlet temp of 620 degrees aft fireroom port and starboard |
| 108.2a Describe the function of the following major components: Superheater | increases efficiency of propulsion turbines, sends saturated steam to superheated steam, Safety relief valves rated @ 720 psi, outlet temp is at 620 degrees |
| 108.2b Describe the function of the following major components: Economizer | aids in circulation of boiler feedwater & steam, feedwater flows through tubes before entering steam drum |
| 108.2c Describe the function of the following major components: Steam drum | changes water to steam |
| 108.2d Describe the function of the following major components: Water drum | stores boiler water, treated scum settles in water drum & is blown over the side |
| 108.2e Describe the function of the following major components: Furnace | where fuel is atomized & boilers lit, bricks het up to 1500 degrees for producing steam |
| 108.2f Describe the function of the following major components: Soot blowers | blows soot from furnace out stacks |
| 108.2g Describe the function of the following major components: turbine forced draft blowers | provides wter to furnace, sucks air into plenum chambers to aid in combustion, steam driven forced draft blower |
| 108.2h Describe the function of the following major components: Light off blower | electric for light off purposes |
| 108.2i Describe the function of the following major components: Boiler safety valve | release of stem when pressure above max op temp |
| 108.3a Describe the following methods of combustion control: Automatic | at control board |
| 108.3b Describe the following methods of combustion control: Remote | at control board |
| 108.3c Describe the following methods of combustion control: Local | controlled air manually adjust valves |
| 108.4 State the function of the Chelant Boiler Water Treatment system | 30 gal hydraulic tank, uses nitrogen pressure to force chemicals into DFT, maintains boiler water purity which reduces corrosion in boiler, keeps water free of O2 |
| 108.5a State the location and function of the following feedwater components: Deaerating feed tanks | removes air from condensate enters DFT and comes in contact with Aux exchange steam |
| 108.5b State the location and function of the following feedwater components: Main feed pumps | Ops level, steam provides high pressure to boiler |
| 108.5c State the location and function of the following feedwater components: Main feed booster pumps | lower leve, electric, provides positive suction to feed pumps. |
| 108.5d State the location and function of the following feedwater components: Feedwater control valve | maintains water level in steam drum |
| 108.6 State the purpose and normal operating pressures of boilers onboard. | to provide min team for propulsion, provides aux steam for distilling plants, laundry, galley, and heads |
| 108.7a Discuss the purpose of the following automatic boiler controls: Feedwater control | maintains boiler level automatically at +/- 1 |
| 108.7b Discuss the purpose of the following automatic boiler controls: Fuel Oil (F/O) control | maintains fuel oil at an adequeate supply for combustion |
| 108.7c Discuss the purpose of the following automatic boiler controls: Combustion air control | operates @ 115-125 psi |
| 108.7d Discuss the purpose of the following automatic boiler controls: Air lock | comes in at 85 psi (alarm) by control panel, goes into airlock at 65 psi |
