"Expander" processing. Tube Expanders are rolling tube type expansion tools used for fixing and molding tubes to tube sheets in the manufacturing processes of heat exchangers such as boilers and condensers.
What is tube expansion?
Tube Expanding is the process of reducing a tube wall by compressing the outer diameter (OD) of the tube against a fixed container, such as rolling into tube sheets, drums, ferrules, or flanges. To assure a proper tube joint, the tube wall must be reduced by a predetermined percentage.Oct 6, 2020
How do you calculate tube expansion percentage?
By subtracting “E” from the rolled diameter you determine the actual amount of expansion (tube wall reduction) on the inside diameter of your tube. This can be converted to a % of wall reduction by dividing the actual wall thickness (“B minus D”) . 130” into the amount of roll .