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Yes , Alakli boil out activity is necessary to carry out the measurable removal of oil and grease attached inside tube surface i.e less than 3 ppm limit for oil and grease .

If this activity not carried out then layer of oil and grease will offer heat resistence in heat transmission from surrounding to tube fluid , which further unable to clear sufficent impurities during steam blowing activity to achieive desired steam purity i.e silica less than 0.02 ppm , may overheat the tube surface.

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