USCG USCG Steam
Set 14 • Question #168 of 496
Launch Interactive Practice Room The primary difference between sludge and scale deposits in boiler tubes is __________.
A
scale forms only on the cooler boiler tubes whereas sludge forms on all tubes
B
scale forms as the result of the crystallization of salts, whereas sludge may consist of reaction products from boiler treatment
✓ Correct Answer
C
sludge is hard and non-adherent at operating temperatures, whereas scale can be deposited at any boiler temperature range
D
scale is heavier than water and forms in lower drums and headers, whereas sludge is more likely to form along the steam drum waterline
USCG NMC Regulatory Explanation
In USCG Steam Plants (Boilers & Turbines), regarding 'The primary difference between sludge and scale deposits in boiler tubes is', the verified engineering fact is: 'scale forms as the result of the crystallization of salts, whereas sludge may consist of reaction products from boiler treatment'.
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