1 Technical Requirements

If HRSG tubing heat exchange surface uses fins, they shall not be higher than 3/4 inch; shall not have a fin spacing of more than seven fins per inch of tube length; may be serrated fins; and shall be attached by a continuous weld. The tube fin thickness shall be a minimum of 0.049 inch. HRSG economizer and evaporator tubes shall not be less than 1.5 inches outside diameter. Tubes for other ... ................
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