GB151 Solving for the evaluation of heat exchange tubes
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GB151-1999 B2.3.1 Specifications for evaluation tubes: “When the wall thickness of the heat exchange tube is 2.5 mm or less, the difference between this thickness and the diameter of the tube shall not exceed 15%.” Does this 15% limit refer to the evaluation tube, or something else?
When the wall thickness of the heat exchange tube is 2.5 mm or less, the difference between it and the diameter and wall thickness of the tube should not exceed 15%, referring to 15% of the tube’s diameter and wall thickness.