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  • Internal corrosion can take place inside boiler tubes under certain boiler water conditions.

  • The corrosive action eats into the tube metal, removing iron and resulting in thinner tube walls.

  • If this action is allowed to continue, certain tubes will fail and will rupture, as the thinner section of tube can no longer withstand the internal operating pressure.

  • The removed metal, products of corrosion, can also cause a problem, as this material now increases the total quantity of solids contained in the boiler water.

  • As we know, this can increase the probability of deposits and scale formation on the inside wall of the tubes.

  • So what are the conditions that cause corrosion and loss of metal inside the boiler drums and boiler tubes?

  • Well, there are basically three independent causes of corrosion, and they are Acid attack, which occurs when the boiler water is in an acidic condition, that is, low pH.

  • Caustic attack, which occurs when the alkalinity of the boiler water is too high.

  • The pH level is above about 10.5.

  • The presence of dissolved gases such as oxygen and carbon dioxide in the boiler water.

Internal corrosion can take place inside boiler tubes under certain boiler water conditions.

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B2 AU boiler corrosion tube water metal internal

lesson 5 || internal corrosion at boiler water control

  • 5 0
    陳建鴻 posted on 2024/11/16
Video vocabulary

Keywords

material

US /məˈtɪriəl/

UK /məˈtɪəriəl/

  • noun
  • Cloth; fabric
  • Supplies or data needed to do a certain thing
  • Substance from which a thing is made of
  • Supplies needed for a task or activity.
  • other
  • Fabric or cloth.
  • Information or data used for a particular purpose.
  • A substance from which something is made or can be made.
  • adjective
  • Relevant; (of evidence) important or significant
  • Belonging to the world of physical things
  • Relating to physical matter or substance.
basically

US /ˈbesɪkəli,-kli/

UK /ˈbeɪsɪkli/

  • adverb
  • Used before you explain something simply, clearly
  • Used as a filler word or discourse marker, often to indicate a summary or simplification.
  • In the most important respects; fundamentally.
  • In essence; when you consider the most important aspects of something.
  • Primarily; for the most part.
  • In a simple and straightforward manner; simply.
scale

US /skel/

UK /skeɪl/

  • noun
  • Size, level, or amount when compared
  • Small hard plates that cover the body of fish
  • Device that is used to weigh a person or thing
  • An instrument for weighing.
  • A sequence of musical notes in ascending or descending order.
  • Range of numbers from the lowest to the highest
  • The relative size or extent of something.
  • Dimensions or size of something
  • verb
  • To adjust the size or extent of something proportionally.
  • To change the size of but keep the proportions
  • To climb something large (e.g. a mountain)
  • To climb up or over (something high and steep).
  • To remove the scales of a fish
presence

US /ˈprɛzəns/

UK /ˈprezns/

  • noun
  • A person who is present in a particular place.
  • The same place or area that a person is
  • A person who is present in a particular place.
  • Ability to reach a market, group of people etc.
  • The state or fact of existing, occurring, or being present in a place or thing
  • Something not physically seen but felt to be there
  • Feeling a person gives by being noticeable
  • other
  • The state of being in a particular place.
  • The existence of something in a particular place or thing.
  • The range of higher frequencies in a sound signal.
  • The fact of being noticed or having an effect.
  • The impressive manner or appearance of a person.
  • A feeling that someone or something is present.
pressure

US /ˈprɛʃɚ/

UK /'preʃə(r)/

  • noun
  • Anxiety caused by difficult problems
  • Force, weight when pressing against a thing
  • Strong persuasion to do something
  • other
  • To apply pressure to something
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  • To apply physical force to something.
  • other
  • The burden of physical or mental distress.
  • The difficulties in your life
  • The force exerted per unit area.
  • Force of blood pushing against the walls of the arteries
  • The act of exerting influence or control.
  • Political or social force or influence.
  • A sense of urgency or stress caused by time constraints.
  • A feeling of stressful urgency caused by expectations
  • other
  • The exertion of force upon a surface by an object, fluid, etc., in contact with it.
  • The use of persuasion, influence, or intimidation to make someone do something.
  • The continuous physical force exerted on or against an object by something in contact with it.
  • The force applied in printing to transfer ink to paper or another surface.
  • Stress or strain caused by demands placed on someone.
  • verb
  • To apply force to something
  • To persuade or force someone to do something
increase

US /ɪnˈkris/

UK /ɪn'kri:s/

  • noun
  • A rise in size, amount, or degree.
  • Fact of increasing; amount something grows by
  • A rise in size, amount, number, etc.
  • A rise in size, amount, number, etc.
  • A rise in strength or intensity.
  • other
  • To become or make larger or more numerous; to grow.
  • To become larger or greater in size, amount, number, etc.
  • other
  • To make larger or greater in number, size, or extent.
  • To make something larger or greater in size, amount, number, etc.
  • verb
  • To make or become larger in size or amount
  • other
  • A rise in amount, number, or degree.
  • other
  • A rise in amount, number, or degree.
condition

US /kənˈdɪʃən/

UK /kənˈdɪʃn/

  • other
  • The state of physical fitness.
  • verb
  • To improve something to make it better
  • To cause to behave automatically in a certain way
  • noun
  • Disease or other medical problem
  • A requirement or stipulation.
  • The state of living you are in, e.g. good health
  • Something required in a business contract; term
  • other
  • To train or accustom (someone or something) to behave in a certain way or to accept certain circumstances.
occur

US /əˈkɚ/

UK /əˈkɜ:(r)/

  • verb
  • To come to pass or to happen
  • other
  • To come into one's mind.
  • To come into the mind.
  • To be found to exist or appear in a particular place or situation.
  • To be found to exist; to be present.
  • To take place; to happen.
section

US / ˈsɛkʃən/

UK /'sekʃn/

  • noun
  • Any of several parts or pieces that fit together to constitute a thing.
  • A part of a whole
  • Specific group of people from a larger group
  • Part of a book, newspaper, etc.
  • verb
  • To divide something into smaller parts
result

US /rɪˈzʌlt/

UK /rɪ'zʌlt/

  • noun
  • Something produced through tests or experiments
  • Final score of a competition, election or game
  • other
  • To happen or exist as a consequence of something.
  • verb
  • To be the outcome of other causes and effects