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4.3.5 If the heat exchanger or pressure vessel shows signs of corrosion beyond mild surface corrosion, the heat exchanger or pressure vessel should be further inspected for soundness by a professional engineer with expertise in the field, or an ASME inspector. 4.3.6 Alterations to heat exchangers and pressure vessels shall be allowed only as ... Dec 01, 2020 · The cost to replace the heat exchanger in your gas furnace is about $815 when the part is under warranty and all you pay is labor. The price range you’ll pay is between $360 to $2,800 based on the cost and availability of the part, and the labor charge from the HVAC repair company installing it. The heat exchanger was modeled using an equivalent pipe diameter preserving the hydraulic properties through the heat exchanger such as pressure drop and the representative design flow velocity. Upon careful consideration, test results for both approaches were insignificantly different.