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MM Study Guide > BoilerWater/FeedWater > Flashcards

BoilerWater/FeedWater Flashcards

1
Q

Boiler water

A

The feedwater as it enters the boiler steam drum

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2
Q

What effect will an excess of hydrogen ions have on boiler water?

A

Increase in acidity

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3
Q

A PH of seven is

A

Neutral

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4
Q

What effect will an excessive amount of hydroxyl ions have on boiler water?

A

Alkalinity will increase

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5
Q

Initial reaction that takes place between pure oxygen free water and the iron in the boiler water after light off

A

Formation of a magnetite layer

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6
Q

Function of magnetite layer

A

Passivate the tube metal and reduce corrosion to minimum

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7
Q

Two major hardness constituents and the primary sources of scale in boilers

A

Calcium and magnesium

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8
Q

What type of deposits act as insulators and reduce heat transfer across any surface?

A

Scale

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9
Q

Modern naval boilers can tolerate no more than a few thousandths of an inch of scale on tube surfaces without suffering what?

A

Tube ruptures

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10
Q

Chloride is an indication of what type of contaminator?

A

Seawater

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11
Q

Chloride causes dissolution of?

A

Magnetite layer

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12
Q

The ability of a liquid to conduct an electrical current is?

A

Conductivity

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13
Q

Conductivity is expressed in

A

Micromhos per centimeter

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14
Q

What will an excessively high conductivity cause?

A

Carryover

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15
Q

How are dissolved and suspended solids controlled in a steaming boiler?

A

By blowdowns

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16
Q

Which type of carryover is caused by excessive amounts of dissolved and suspended solids

A

Foaming

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17
Q

What is the primary source of silica contamination

A

Poor quality shore source feedwater

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18
Q

Desiccant is mostly comprised of what material

A

Silica gel or silicate

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19
Q

Type of deposits when the boiler water is contaminated with oil

A

Carbonaceous deposits

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20
Q

What effect does seawater have on boiler water

A

Decreases alkalinity which could lead to acid corrosion

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21
Q

Shore water causes alkalinity to

A

Increase

22
Q

Type of corrosion caused by shore water contamination

A

Caustic corrosion

23
Q

A malfunctioning or improperly operating dft will cause

A

Dissolved oxygen corrosion

24
Q

Why and where is hydrazine added/introduced to the system?

A

To reduce corrosion in the pre-boiler system/ deareating feed tank.

25
Q

Three treatment chemicals used to batch treat the boilers

A

Tsp/Dsp/ caustic soda

26
Q

What does tsp have on boiler water

A

Increase alkalinity, phosphate and conductivity

27
Q

What does dsp have on boiler water

A

Increases phosphate and conductivity

28
Q

What does caustic soda have on boiler water

A

Increases alkalinity and conductivity

29
Q

Sludge in boiler water is

A

Reaction of boiler water treatment chemicals with calcium and magnesium contaminants.

30
Q

How is sludge removed from boiler

A

Bottom blowdown

31
Q

This type of blowdown reduces the amount of materials dissolved in boiler water.

A

Surface blowdown

32
Q

Why conduct daily salinity indicator comparisons

A

Make sure salinity indicator is working

33
Q

What is the maximum allowable tolerance for the daily salinity indicator comparison test?

A

Plus or minus .02 EPM

34
Q

The maximum chloride limit for reserve feedwater is

A

.10 EPM

35
Q

The maximum salinity indicator reading on an auxiliary condenser

A

.02 EPM

36
Q

Boiler water phosphate test is measured in

A

PPM

37
Q

The required ph limit for shore steam

A

8-9.5 ph units

38
Q

What effect does desiccant have on boiler water?

A

Increases silica content

39
Q

What is nitrogen used for in the continuous treatment system

A

To pressurize the continuous treatment tank and force out treatment solution

40
Q

Securing the boiler will stop all damage except

A

Acid corrosion and oxygen corrosion

41
Q

What type of test method is the boiler water phosphate test

A

Volumetric

42
Q

What are the two classes of sampling errors?

A

Random

Systematic

43
Q

If boiler water is inadvertently sampled while a chemical addition is in process and high results are obtained what type of error has occurred

A

Random

44
Q

What is a systematic error?

A

It occurs when a sample is drawn from one part of a liquid, when that liquid is not mixed and different levels of concentration exist throughout.

45
Q

What is the range of the dissolved oxygen comparator?

A

0-40 parts per billion

46
Q

The boiler water conductivity test is what test method

A

Electrometric

47
Q

What is used onboard ship to calibrate conductivity and ph meters

A

Standards

48
Q

When must conductivity meters be calibrated

A

Quarterly and anytime electrical power is interrupted

49
Q

How is the conductivity meter standardized

A

by performing the boiler conductivity standard test

50
Q

When preparing nitric acid reagent how much stock solution is used

A

50 ml

51
Q

How must mercuric nitrate waste be disposed

A

By turning the waste into public works or any naval shipyard and conforming to any local or state disposal requirements.

52
Q

how long is prepared phenolphthalein indicator good for

A

indefinitely

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