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MK2 SWE > Auxillary > Flashcards

Auxillary Flashcards

1
Q

What device transfers heat from one fluid to another?

A

Heat exchanger

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2
Q

What is the most common type of heat exchanger used in the Coast Guard?

A

Shell and tube

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3
Q

The fin and tube heat exchanger is an air cooled condenser in AC/R systems. What increases the surface area and aids in transferring heat?

A

The fins

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4
Q

How does a condenser work in an AC/R system?

A

It changes refrigerant from a vapor to a liquid as heat is transferred from the vapor to the surrounding water

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5
Q

Corrective maintenance is conducted conditionally on heat exchangers when?

A

Fluid is leaking from the heat exchanger or the system is not operating within normal parameters

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6
Q

Before draining, cleaning, and inspecting a heat exchanger that is part of an AC/R system who must recover the refrigerant?

A

AN EPA certified technician

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7
Q

What is generally the best method for cleaning tubes because it removes all soft fouling?

A

High-pressure water jet

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8
Q

Where can you find all the information you need about heat exchangers?

A

NSTM, Chapter 254

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9
Q

Backflushing is only required on what kind of plate type heat exchanger?

A

Seawater cooled

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10
Q

What do you never want to do on a plate type here exchanger while it is running?

A

Tighten or loosen the plate pack

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11
Q

Exercise extreme caution when handling plates because?

A

The edges can be extremely sharp. Always wear gloves

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12
Q

How do you want to remove the plates and a plate type heat exchanger?

A

Tilt them toward the rear of the unit until the top slot is free of the guide bar.

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13
Q

How do you want to clean the plates on a plate type heat exchanger?

A

With a fiber brush and clean water

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14
Q

What is the primary goal for expecting plate type heat exchangers?

A

To detect for leaks

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15
Q

Not more than how much percent of a heat exchanger can be plugged before it has to be replaced?

A

10%

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16
Q

How much time do you allow that he served here after you replace the gaskets?

A

12 hours

17
Q

What are the two types of auxiliary boilers?

A

Fire tube and water tube boilers

18
Q

Third vantage of fire two boilers are what?

A

Inexpensive to build

Simple to operate

And less maintenance

19
Q

The disadvantages of the fire tube boilers is what?

A

Long warm-up time

And weight of the unit compared to the amount of steam produce

20
Q

The advantages of the water tube boilers are what?

A

Les warm-up time in the ratio of size and weight to steam produced

21
Q

The disadvantages of the water tube are what?

A

Requires more maintenance and are expensive to build

22
Q

The temperature at which water boils is called what?

A

Boiling point or saturation temperature

23
Q

As Steve gives up his he returns to its liquid state it is called what?

A

Condensate

24
Q

What is used in the auxiliary boiler to produce a controlled fire in the combustion chamber?

A

The burner unit

25
Q

What is installed in the tank to prevent the pump motor and solenoid valve from becoming energized in the event the condensate tank water is low?

A

Float switch

26
Q

During normal operation of a auxiliary boiler the level in the sight glass should be what?

A

Half full

27
Q

What is an alternative method for checking the boiler water level in the event the sight glass is inoperative?

A

Tri-cocks

28
Q

When are blow downs done?

A

Daily or when the total dissolved solids’s is above 1000 ppm

29
Q

On an auxiliary boiler what is the primary device to control the start and stop of the burner?

A

Operative pressure control switch

30
Q

What safety device is designed to shut down the burner in the event the operative pressure control does not secure the boiler at the normally prescribed cut out. of 26 PSI?

A

High limit pressure control switch

31
Q

What are the three general warning lights on the control panel on the boiler?

A

RED = Flame out

BLUE = Low water

WHITE = Power on light

32
Q

What is installed on the boiler to prevent short cycling due to changes in water level due to the ships motion?

A

Adjustable time delay

33
Q

What is the electrical control that controls the start up and shutdown sequence of the boiler?

A

Flame safeguard control (FSC)

34
Q

What is the device where a high-voltage spark is created which ignites the fuel delivered from the nozzle?

A

Ignition electrode

35
Q

On a boiler what delivers a high quantity of air for combustion?

A

Squirrel cage blower

36
Q

The amount of air delivered to the combustion chamber is controlled by the means of what?

A

A manually adjusted air damper

37
Q

When adjusting the air damper it should be marked how on the blower housing for future reference?

A

Scribed

38
Q

What does the stamped number on the side of the fuel nozzle mean?

A

The first number indicates your mouth to fueled that passes through it in gallons per hour

The second number is the angle of the spray

MK2 SWE (7 decks)

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