1. When assembling the heat exchanger tube box nipple and tube box flange, the back of the flange shall prevail, and the bolt holes of both flange faces shall be mid-span.

2. Before assembling the pipe box baffle, the protruding part of B joint in the pipe box shall be polished flat, and then the baffle shall be assembled and welded.

3. When welding tube box baffle in heat exchanger, welding flesh should be flush with flange end face.

4. When the pipe box is connected and the opening is marked, the short joint A shall be in A horizontal position.

5. Heat exchanger tube box nozzles and tube box assembly shall ensure that the nozzles' height tolerance meets the requirements.

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