Heat exchanger tubes stitching

Heat exchanger tubes stitching should meet the following requirements:
Heat exchanger tubes splicing, welding butt joints should be assessed. The number of specimens, size, test methods according to JB4708 requirements; aluminum, copper, titanium welded joints can be implemented by reference.

Heat exchanger tubes stitching, butt weld with a heat exchange tube, straight tube not more than one; U-shaped tube not more than two; the shortest tube length not less than 300mm; including at least 50mm of straight pipe U-bend section of the rangeshall not have WELDS.

Heat exchanger tubes splicing, the pipe end bevel should be processed by mechanical methods, should be cleaned before welding.

Heat exchanger tubes splicing, the corresponding amount of the wrong side of the wall thickness of the tubes should not exceed 10% and not more than 0.3mm, straightness deviation will not affect the smooth tube wear is limited.

Heat exchanger tubes after docking, the table should be selected steel ball diameter on the inspection of welded joints to pass the ball to the ball to pass through.

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Keywords: reactor, heat exchanger, pressure vessel