The primary difference between sludge and scale deposits in boiler tubes is __________.
scale forms only on the cooler boiler tubes whereas sludge forms on all tubes
scale forms as the result of the crystallization of salts, whereas sludge may consist of reaction products from boiler treatment
sludge is hard and non-adherent at operating temperatures, whereas scale can be deposited at any boiler temperature range
scale is heavier than water and forms in lower drums and headers, whereas sludge is more likely to form along the steam drum waterline
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