MM "A" School Test 2
Below 15psi (~14PSI)
600/14PSI AUGMENTING VALVE STARTS TO OPEN WHEN AUXILIARY EXHAUST PRESSURE DROPS BELOW WHAT PSI?
Relief, Safety
A _______ Valve lifts and resets at the same pressure, and a _______ valve lifts at a set pressure, and reseats at a significantly lower pressure.
16psi
At what pressure does the main or auxiliary condenser unloading valves start to open?
18psi
At what pressure is the main or auxiliary condenser unloading valve fully open?
Removing
De-aeration is the process of _____ dissolved oxygen from the water.
Lay up duration, Planned Maintenance to be completed, Shore support, Planned repairs to be completed.
Determining idle boiler lay up depends on what considerations?
1.)Atmosphere 2.)Bilge 3.)Uptake
Escape steam piping system directs excess steam to what locations?
Generation Phase, Expansion Phase, Condensation Phase, Feed Phase
Four phases of the basic steam cycle? (In order)
Chemical ➡️ Thermal
Fuel oil burned converts _______ energy to _______ energy in the boiler firebox.
Hand easing gears
How do you operate boiler safety valves manually?
Over speed trick valve
If a Main Feed Pump is in an over speed condition, what protects it from damage?
Nozzle, Blade
In a Rateau Stage, steam flows through the _____ first, then through the _____.
Generating Tubes
Largest bank of tubes that makes the most amount of steam in the boiler are called?
1.) Surface 2.) Continuous 3.) Bottom
List the 3 blowdowns the Navy conducts:
1. Type of design and construction 2. Type of arrangement of staging 3. Direction of steam flow 4. Repetition of steam flow 5. Division of steam flow 6. Type of exhaust
List the six classifications of a turbine?
Redirect steam flow
Moving blades of a turbine convert kinetic energy of steam to mechanical energy. What do fixed blades do?
S.H.I.T 1.(S)uper (H)eater 2.Safety 1 (I) 3. Safety (T)wo
Name the 3 boiler safety valves. What is the safety valve lifting order?
1.) Shell pressure relief valve 2.) vacuum breaker
Name two safety devices on the dft?
Thermal, Kinetic
Nozzles convert _______ energy of steam into _______ energy.
Warmup/ Bypass Valve
Sudden temperature changes in steam piping develops stress. What allows the controlled warm up of downstream piping and equalization across valves?
True
T/F: In a helical flow turbine, steam is directed into the steam buckets, into a reversing chamber and then back into the steam buckets.
15PSI
The DFT operates at what pressure?
600/14
The ________ augmenting station is used to augment Auxiliary Exhaust.
Steam drum
The automatic feed water control valve opens and closes as needed to control water level in what component?
DFT
The auxiliary exhaust system is usually the main cause of an unstable _____?
15psi
The auxiliary exhaust system operates at what pressure?
300-450
The auxiliary exhaust system operates at what temperatures?
Non-condensing gases
The auxiliary exhaust system provides a means to recover steam from?
Feed Phase
The bottom half of the DST is what phase of the basic steam cycle?
Radiant heat
The superheater is protected from what type of heat?
4
The vacuum breaker is set at approximately __"H20
Main steam stop
The valve that isolates 600 Main steam from the boiler is called?
30
To prevent over pressurizing the de-aerating feed tank shell, the relief valve is set at ___PSI
Kinetic ➡️ Mechanical
Turbines convert the _______ energy of the steam to ________ energy to perform useful work.
Expansion loop
What allows thermal expansion or contraction of steam system piping?
Heated Air, Desicant
What are methods of Dry Lay-Up?
1.)Pre-heat water 2.)Remove oxygen (deaerate) 3.)Provide storage
What are the 3 functions of the DFT?
1.) Normal 2.)Relief 3.)Maintenance/Safety
What are the 3 positions of the CERV?
Wet, Dry
What are the two categories of idle boiler lay-up?
Downcomers
What boiler tube brings feed water from the steam drum down to the water drum and lower heads?
De-superheater
What boiler tube is located in the water drum?
Spray Nozzle
What component divides the condensate into a fine mist, providing a large surface area for the steam in the pre-heater compartment to act upon?
Distilling plant
What components use auxiliary exhaust?
Engineering Operation(EO); Sequencing System (SS), Procedures (P), Casualty Control (CC)
What does EOSS, EOP, EOCC stand for?
Allows boilers in one Main Machinery Room (MMR) to supply steam to More than one MMR.
What does cross-connected mean?
Operating two propulsion plants that are independent.
What does split plant mean?
Thermal ➡️ Mechanical
What energy conversion takes place in the expansion phase?
Chemical ➡️ Thermal
What energy conversion takes place in the generation phase of the basic steam cycle?
HP: Single LP: Double
What flow type is the HP/LP Turbine?
Refractory
What insulates the boiler and minimizes heat loss?
Removes combustible gas from furnace; Electric Force Draft Blower (FDB)
What is a furnace purge and what is used to conduct one?
Steam bucket
What is another name for a turbine blade?
Safety Valve- Resets at a significantly lower pressure Relief valve- Resets at the same pressure
What is the difference between a safety valve and a relief valve?
+3/-3
What is the maximum temperature differential between the upper and lower halves of the dft?
Allows to flex; Prevents cracking and breaking
What is the purpose of an Expansion (piping) loop?
Buoyancy
What is the purpose of inter-bottoms?
Provides positive-head suction to the Main Feed Pump (MFP)
What is the purpose of the Main Feed Booster Pump (MFBP)?
Pumps feed water to boiler 150-200PSI Above boiler operating pressure
What is the purpose of the Main Feed Pump (MFP)?
Dumps excess exhaust to the atmosphere
What is the purpose of the auxiliary exhaust atmospheric unloading valve?
Protects the non-condensing turbine casing from over-pressurization by functioning as a relief valve.
What is the purpose of the combination exhaust relief valve (CERV)?
2 valve protection, isolates HP/LP Turbine
What is the purpose of the main engine guarding valve?
Vents foreign material from entering main engine
What is the purpose of the main steam strainer?
Steam around reducing valve
What is the purpose of the reducing station bypass valve?
1.)Locks in the atomizer and prevents cutting in just fuel 2.) Enables you to cut off one burner
What is the purpose of the safety shut off device (SSD)?
Prevents changes in water level caused by roll of ship
What is the purpose of the swash plates in the dft?
Prevents swirling motion of water
What is the purpose of the vortex elminator?
600/14 Augmentor
What is used to augment the Auxiliary Exhaust system?
Spring hangars
What is used to hold and support pipes?
Auxiliary exhaust hp drain
What is used to pre heat condensate in the DFT?
Sootblowers
What is used to remove soot from boiler tubes?
Constant- Speed Governer
What limits the speed of a main feed pump?
Economizer
What preheats incoming feed water 100F-200F?
Wye Strainer
What prevents foreign particles from entering a reducing valve?
Shell pressure relief valve
What safety device prevents the dft from over pressurizing?
Vacuum breaker
What safety device protects the dft from collapsing?
Screen wall tubes
What set of boiler tubes protects the superheater?
Diaphragm Air Pilot Control Valve
What type if reducing valve use LP Air to control outlet pressure?
Steam Atomization
What type of atomization are you going to use after you light off?
Air Atomization
What type of atomization are you going to use if you are the first boiler to light off?
Radial - Perpendicular Flow Axial - Parallel Flow Helical - Tangent Flow
What type of steam flow is a radial, axial, and helical turbine?
Sky valve
What valve dumps excess auxiliary exhaust pressure to the atmosphere?
Bulkhead isolation valve
What valve separates two of the same systems from compartment to compartment?
Cross connect
What valve separates two of the same systems from one MMR to another MMR?
SSD
What would you use to secure 1 or 2 burners?
Fuel oil quick closing valve
What would you use to secure all fuel flowing to an applicable boiler?
Steam Atomization, Steam Smothering, Superheated Protected Steam (SPS)
Where does 150PSI De-Superheated steam go to?
De-superheater
Where does 600PSI Auxiliary steam come from?
Superheater
Where does the 600 Main steam come from?
Non-Condensing Turbine
Where does the auxiliary exhaust come from?
Bottom
Which blow down cannot be done while the boiler is online?
De-Superheater
Which component produces 600PSI Auxiliary steam?
Feed Water Drain
Which drain system is located inside of the MMR and operates below 150PSI?
LP/Hotel
Which drain system is located outside of the MMR and operates below 150PSI?
HP Drain
Which drain system operates above 150PSI and goes to the DFT?
Rear wall and Side wall
Which set of boiler tubes protect refractory?
Main Steam Stop
Which valve provides a means to isolate the boiler from the Main Steam system?
1.) Make up feed 2.)Excess condensate dump valve
Which valves control DFT water level?
NAVSEA
Who sets boiler safety valves?
Too much fuel not enough air; 2min
Why do we get heavy black smoke and how many minutes to secure?
Too much air not enough fuel; 1min
Why do we get white smoke and how many minutes to secure?