Steam Systems and Condensate Reuse Quiz
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Questions and Answers

Why does a steam system that does not reuse condensate require more external feedwater treatment, chemical input, heat input, and water input?

  • To minimize the overall cost of plant operations
  • To reduce the environmental impact
  • To ensure the condensate is pure
  • To prevent scaling and corrosion in the system (correct)

What is one of the reasons for treating condensate from steam systems?

  • To minimize the overall cost of plant operations
  • To remove air intrusions from condensate return tanks
  • To increase the temperature of the condensate
  • To prevent impurities from scaling up or corroding the boilers (correct)

Why should condensate be pure in a steam system?

  • To prevent impurities from scaling up or corroding the boilers
  • Because it is essentially distilled water (correct)
  • To increase the temperature of the condensate
  • To reduce the environmental impact

What is the main concern related to impurities in condensate?

<p>Scaling and corrosion in the condensate return and feedwater systems (C)</p> Signup and view all the answers

Why might strict environmental licenses prohibit systems that use a significant percentage of make-up water?

<p>Due to concerns about environmental impact and water usage (D)</p> Signup and view all the answers

What are some sources of impurities that can enter condensate in a steam system?

<p>Hydraulic oils and process fluids (C)</p> Signup and view all the answers

How does carbon dioxide enter boilers and steam systems?

<p>From the raw water supply as alkalinity species (D)</p> Signup and view all the answers

What is the consequence of carbonic acid formation due to the presence of carbon dioxide?

<p>Localized grooving and thinning of metal parts (C)</p> Signup and view all the answers

How does oxygen corrosion appear on metal surfaces?

<p>As black oxides and pitting (B)</p> Signup and view all the answers

What is the main cause of boilers scaling up?

<p>Hardness (A)</p> Signup and view all the answers

What is a method for combatting condensate corrosion suggested in the text?

<p>Installation of dealkalization equipment in the external treatment systems (B)</p> Signup and view all the answers

How can dissolved CO2 and O2 be minimized in feedwater?

<p>By properly heated and vented deaerators (B)</p> Signup and view all the answers

What is the purpose of neutralizing amines in steam systems?

<p>To reduce corrosion caused by carbon dioxide (B)</p> Signup and view all the answers

Why is it important to monitor boiler alkalinity?

<p>To maintain control limits through continuous blowdown (A)</p> Signup and view all the answers

What is the purpose of filming amines in steam systems?

<p>To create protective films on metal surfaces (B)</p> Signup and view all the answers

Why must filming amines be introduced into the system gradually?

<p>To prevent rapid deposition of particles (B)</p> Signup and view all the answers

What is the purpose of condensate polishers in steam systems?

<p>To purify the condensate by filtering out particulate and suspended matter (A)</p> Signup and view all the answers

What happens when the ion exchange and filtration abilities of condensate polishers become exhausted?

<p>They require regular backwashing and regeneration (B)</p> Signup and view all the answers

Why is ammonia not suitable for neutralizing carbonic acid in systems with components made of copper, zinc, or nickel?

<p>Because ammonia will corrode components made of copper, zinc, or nickel (D)</p> Signup and view all the answers

How are neutralizing amines typically fed into steam systems?

<p>Through metering pumps injecting directly into steam lines (A)</p> Signup and view all the answers

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