Heat exchanger tube sheet

Heat exchanger tube sheet
A, tube sheet heat exchanger splice butt joints should be 100% of the ray or ultrasonic testing, according to JB4730-ray inspection of not less than grade Ⅱ, or ultrasonic testing in grade Ⅰ qualified.
In addition to stainless steel, the splice should be made after the tube plate stress relief heat treatment.
B, composite heat exchanger tube sheet welding
a) heat exchanger should be made before surfacing welding technology assessment;
b) primary heat exchanger surface surfacing materials to be processed and re-layer material (before drilling) on ​​the surface, should be JB 4 7 3 0 for surface testing, test results may not have cracks, into the vent, and should be consistent Grade Ⅱ defects display;
c) the use of heat exchanger tubes and tube sheet shall not be welded plus bridge the gap between the tube sheet welding method of welding.
Partition groove seal surface should be flush with the annular sealing surface, or slightly below the annular sealing surface (controlled at 0.5 mm or less).


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Keywords: reactor, heat exchanger, pressure vessel