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?