Steam Systems and Condensate Reuse Quiz

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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?

Scaling and corrosion in the condensate return and feedwater systems Signup and view all the answers

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

Due to concerns about environmental impact and water usage Signup and view all the answers

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

Hydraulic oils and process fluids Signup and view all the answers

How does carbon dioxide enter boilers and steam systems?

From the raw water supply as alkalinity species Signup and view all the answers

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

Localized grooving and thinning of metal parts Signup and view all the answers

How does oxygen corrosion appear on metal surfaces?

As black oxides and pitting Signup and view all the answers

What is the main cause of boilers scaling up?

Hardness Signup and view all the answers

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

Installation of dealkalization equipment in the external treatment systems Signup and view all the answers

How can dissolved CO2 and O2 be minimized in feedwater?

By properly heated and vented deaerators Signup and view all the answers

What is the purpose of neutralizing amines in steam systems?

To reduce corrosion caused by carbon dioxide Signup and view all the answers

Why is it important to monitor boiler alkalinity?

To maintain control limits through continuous blowdown Signup and view all the answers

What is the purpose of filming amines in steam systems?

To create protective films on metal surfaces Signup and view all the answers

Why must filming amines be introduced into the system gradually?

To prevent rapid deposition of particles Signup and view all the answers

What is the purpose of condensate polishers in steam systems?

To purify the condensate by filtering out particulate and suspended matter Signup and view all the answers

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

They require regular backwashing and regeneration 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?

Because ammonia will corrode components made of copper, zinc, or nickel Signup and view all the answers

How are neutralizing amines typically fed into steam systems?

Through metering pumps injecting directly into steam lines Signup and view all the answers