Navy Shipboard Drainage, Boilers & Steam Turbines: Systems and Operations

What type of fuel is the stripping and reclamation system used for?

Diesel Fuel Marine (DFM)

What is the purpose of the OCM?

To monitor effluent water quality downstream of an Oil/Water Separator (OWS) or a secondary treatment system.

Where is acceptable processed water discharged?

Overboard

What device continuously monitors and indicates the cumulative gallons of waste oil discharged by the OWS System?

Flow Totalizer

Where are the two sensors installed on the Oily Waste Holding Tank (OWHT) that control the operation of the OWS System?

One sensor is mounted at the upper liquid level, and the other at the lowest liquid level.

Where is the OCM mounted and why?

Downstream of an Oil/Water Separator (OWS) or a secondary treatment system to monitor the effluent water quality.

What is designed to transmit power between two components?

Flexible Couplings

What eliminates excessive mechanical stress of the pump shaft and extends the life of rotating machinery?

Coupling and shaft alignment

What occurs in the process of alignment?

Adjusting a piece of machinery so the centerline of its shaft is accurately positioned.

What is considered the amount of change in relative shaft position that occurs when horizontally mounted machinery changes from room temperature to operating temperatures?

Thermal Growth

Who authorizes alignment methods?

NAVSEA

What is the main function of the shipboard drainage systems?

Removal of normal waste water

What system is used to empty fuel tanks that have been ballasted with seawater?

Main Drainage Systems

What is the purpose of the eductor?

Takes suction from the drainage main to the discharge piping leading overboard.

What characteristic is unique to the secondary and special drainage systems?

They function independently of the main drainage system.

Where is weather deck drainage piping in larger ships located?

In compartments above the water line.

True or False: The fresh water drain system collects condensate and consists of two separate, independent systems.

True

What system minimizes the possibility of discharging pollutants overboard?

Oily Waste Transfer System (OWTS)

How is oily waste created?

Discharge from Lube Oil (LO), fuel purifier, jet propulsion fuel (JP-5) and separators.

What is a large percentage of oily waste composed of?

Water

What are tanks equipped with?

An air escape, a high-level alarm, and a sounding tube overflow.

Where does the OWS discharge to?

Oily Waste Holding Tank

What equipment activates a three-way solenoid valve to divert the flow back to the Oily Waste Holding Tank (OWHT) if oil concentration exceeds the preset limits?

Oil Content Monitor (OCM)

What is steam that has been heated above its saturation temperature?

Superheated Steam

What is the purpose of combustion gases in a D-type water tube boiler?

Heat the water

Do drum-type boilers have one or more water drums and two or more water headers?

False

What type of energy turns the shaft and drives the ship?

Mechanical

In which phase of the basic steam cycle does liquid boil?

Generation

What phase of the basic steam cycle occurs in the Main Turbines?

Expansion

What phase does steam enter as it leaves, or exhausts, from the Low Pressure Turbine?

Condensate Phase

What phase preheats water and pumps it back to the boiler?

Feed Phase

Are F-type boilers conventional steam boilers?

False

What two drums do propulsion boilers contain?

Steam and Water

What is the definition of boiler operating pressure?

Constant pressure at which the boiler operates.

What chemical does the Navy use to chemically treat boiler water?

Chelant

What is the outer layer of refractory material?

Firebrick

What is the primary advantage of superheating?

Greater Temperature Differential

When do safety valves allow steam to escape from the boiler?

When the pressure rises above specified limits

What is reseating pressure?

The pressure required for the valve to shut.

What component in the boiler determines the safety valve pressure limits?

Steam Drum

What valve part does pressurized steam enter?

Nozzle

What valve system uses boiler pressure to stay seated?

Greno Industrial-Supply Safety Valve

What can cause a discrepancy in the valve opening at its specified limits?

Simmering

What do steam turbines convert?

Thermal energy into Mechanical energy

What carries the moving blades that convert steam kinetic energy into rotating mechanical energy in a steam turbine?

Rotor

What is the purpose of the casing in a steam turbine?

Controls and contains steam

What type of steam flow is described as moving fluid in rotation around the turbine's axis?

Radial Flow

What type of steam flow is described as flowing in the direction that is almost parallel to the axis of the turbine shaft?

Axial Flow

What type of steam turbine converts energy from the steam system through a reduction gear, shaft, and propeller to propel the ship?

Reaction

What equipment do impulse turbines drive?

Forced Draft Blowers

What is the classification of a turbine if steam flows in only one direction?

Single Flow Unit

What is Lube Oil heated to during warm-up procedures?

90°F

When alternating the main engine for warm-up, how long should the shafts not be idle?

Longer than 3 minutes

Should steam be admitted to operate the turbine before the exhaust system has been prepared?

False

How many minutes within bringing the boiler on-line should a boiler water sample be obtained?

30

What system provides a means to remove sludge or total solid concentration?

Bottom Blowdown System

If the steam drum is below 100 PSI, what should not be conducted?

A bottom and header blowdown

What type of blowdown is conducted when water chemistry tests indicate unsatisfactory conditions?

Surface Blowdown

What blowdown clears the boiler of sludge, oil, grease, or suspended solids?

Surface Blowdown

What is the exception of conducting surface blowdown when water chemistry results indicate unsatisfactory?

High Steam Drum Water Level

What produces all steam for the ship in normal ship operation?

Boilers

What steam supplies the 150 PSI steam system?

600 PSI Desuperheated Steam

What is the purpose of the steam drum within the boiler?

Receives feedwater from the economizer and is a place for the accumulation of saturated steam.

What is the purpose of the screen and rearwall tubes in the boiler?

Protects furnace refractories, which allows for higher heat release.

After steam leaves the superheater through the inlet and outlet header, where does the steam travel when it splits in two directions?

Main Engines and Desuperheater

What is the purpose of the boiler plant fuel burner system's six individual burners?

To release the fuel.

How many steaming hours should waterside inspections not exceed?

4,000 Hours

Where is information recorded when inspecting the condition of parts?

Engineering Log

What test is conducted prior to opening the boiler for routine inspection?

Operational

What event should be scheduled to coincide with a strength and integrity inspection?

Depot Level Overhaul

Do contractors conduct the planned maintenance inspections on a boiler?

False

What officer should be fully cognizant of the general conditions of each boiler?

Engineering Officer