What must be maintained during the boiling out process of a newly erected boiler?

During the boiling out process of a newly erected boiler, it is essential to maintain a constant temperature. This process eliminates any oils, grease, or contaminants that may have been introduced during the boiler's construction. By keeping the temperature steady, the cleaning solution remains effective, allowing for a thorough cleaning of the boiler's internal surfaces. A fluctuating temperature could result in incomplete removal of these contaminants, which can lead to operational issues later on.

Maintaining constant temperature also ensures that the materials of the boiler do not experience thermal shock, which could result from rapid temperature changes, potentially causing damage. Thus, consistent thermal conditions are vital for the boiler's integrity and efficiency during the boiling out process.