• Determining proper Amount of Tube Expansion

 

  Percentage reduction of tube wall thickness is generally taken as the guide to the correct amount of expansion to obtain maximum seal between tube and tube sheet, but as the percentage tube wall reduction depends on the diametter of the tube sheet hole, tube O.D, tube wall thicknessm and materials of the tube sheet and tube it is a variable factor.

 In general terms the percentage tube wall reduction will be in the range of 5 to 10%.

 

 The following table illustrates the varying percentage tube wall reduction according to different materials of the tube sheet and tube.